Serpent S811-B Cobra 1/8 RTR

User Manual & Reference Guide

Thank you very much for buying this Serpent rc car. You are now member of a large following of Serpent fans worldwide. This Serpent car will bring you many hours and weekends of racing excitement. Serpent started as rc racing company in 1980, and has developed many modelcars since. This wealth of experience and know how is used in our todays cars and that shows!

The Serpent S811-B Cobra RTR is the best entry in the world of rc offroad racing. Affordable and a very good basis to start your racing carreer. The Serpent S811 Cobra RTR, is based on the high-end competition version of the Cobra and shares geometry and many parts. Still its easy to use, assemble, and set up. The RTR Cobra is fully upgradable to high end competition spec. The details can be found in our website.

You are now part of the worldwide network of Serpent drivers, which gives you superior technical support and access to many benefits that only Serpent drivers can enjoy.

The Serpent S811-B Cobra RTR offers state of the art specifications and leads the way in 1/8 scale electro offroad chassis design, using all the knowledge our designers have gathered from racing offroad cars for over 15 years, into this design too. Continuously pushing the performance envelope.

Designed, tested and raced by Billy Easton, USA. World Champion.

This manual contains a number of steps you need to follow to operate the Serpent cars in the right way. This manual also contains a quick-start section, a partslist and exploded views, and a FAQ section. A full assembly manual can be found online in the Serpent.com website. So read this manual with great attention before racing this car. For your own safety as well as for others, and to ensure you can enjoy your Serpent car a long time, even if you are an experienced user. Serpent is not only about the car itself.

Serpent as company, and the worldwide network or distributors and dealers are here to help you out. The Serpent website, social media and forum are available for assistance and additional information as well.

Enjoy your Serpent, the racing experience!

Contents

• Introduction
• Read this first
• Safety matters
• Quickstart
• Required equipment
• Model specs / overview
• Basic Tuning
• Default Set Up
• Maintenance
• Partslist
• Exploded views

• This is a highly technical hobby product, intended to be used in a safe racing environment. This car is capable of speeds in excess of 80 km/h or 50mph. Please follow these guidelines when building and operating this model.
• Parental guidance is required when the builder/user of this car is under 16.
• Follow the building instructions. If in doubt, contact your dealer or importer.
• Be sure to use the proper tools when assembling the car. Always exercise caution when using electric tools, knives and other sharp objects.
• Be careful when using liquids like lubrication oil or glue. Do not swallow.
• Follow the manufacturer's instruction in case you experience irritation after using the product.
• Be careful when operating the car. Stay away from any rotating parts such as wheels, gears and transmission. Stay away from speedo during and immediately after use, as these parts may be very hot. We advise to use protective handgloves.

Safety matters

Important pre-cautions

• Only run the car is designated areas or areas with very few people, so no-one can get hurt.
• The car has a lot of power and the turning parts on the car can cause damage, also some parts of the car like transmisison and motorparts can become very hot. So wear protective clothing both as driver and helper and be carefull when picking up the car.
• Do not operate the car under dark conditions, as both you and others may not see the car properly and can get hurt, due to lack of car control.
• Use good common sense while operating the car so you can fully enjoy your car.

Safety matters (continued)

• Only operate this car in a safe environment, like a special racing track or a closed parking lot. Avoid using this car on public roads, crowded places or near infants.
• Before operating this car, always check the mechanical status of the car. Check that the batteries of the transmitter and receiver are fully charged.
• After use, always check all the mechanics of the car. We advise to clean the car immediately after use, and inspect the parts for wear or fractures. Replace when necessary. Do not use water, methanol, thinner or other solvents to clean the car.
• Store the car in a dry and heated place to avoid corrosion of metal parts.
• Avoid using this car in wet conditions as the water will cause corrosion on the metal parts and bearings and these parts will cease to function properly. If driven in the wet, ensure that all the electric equipment is waterproofed and after use, that all moving parts are dried immediately.

All instructions in this manual must be followed to ensure safe use of the car. This model is not intended for use by children under 14 years.

Battery and battery-charging

• The battery and battery-charger are not included with this model. For the transmitter you need 4 pcs AA size NIMH batteries and for the car you need a NIMH hump-back of 1600 mA or more.
• Use proper battery-charger specifically designed for that type batteries and follow the instructions of the battery supplier and the charger correctly. Keep the battery and charger always in dry places only and never leave un-attended during charging.
• When the batteries are at their end of life, dispose them at a recycling-place, check www.call2recycle.org for more info.

Quick-start

The quick-start section is not a replacement for the full instructions. To be able to use the model to its best take the time to read the full manual.

1. Read the manual and safety pre-cautions (page 3)
2. Buy and install the batteries in the transmitter (see Transmitter manual)
3. Install the RX=receiver battery pack (not included) in the battery-box and connect as shown in the manual.
4. Turn on the transmitter (see Transmitter manual). Always turn on the transmitter first before to switch on the car and only turn off the transmitter after you switched off the car. Put purpose made modelcar fuel in the fueltank. Start and run in the engine, as described in the seperate engine manual.
5. Check servo operation. Check that the servo works correctly and check that the car runs straight in neutral position, trim as needed.
6. Perform a range test with the radio system.
7. Personalise the body of your car by applying more decals if required.
8. Drive your modelcar.
9. Maintain your modelcar (page 9)

Included with your model

• Serpent modelcar, factory assembled and set-up
• Dragon-RC DTS-1 transmitter (as shown or similar)
• Novarossi 3.5cc (.21) 3 port pullstart engine
• Dragon-RC polished Inline tuned pipe-system
• Dragon-RC racing tyres, pre-mounts
• Dragon-Rc digital servo MG
• Dragon-RC prepainted and pre-cut bodyshell

Required for your model

• Multi Charger; to charge transmitter battery and car battery
• Receiver pack RX hump-pack 1600 mA
• Glowdriver
• Fuel / fuel-bottle
• Safety glasses and gloves
• Battery AA x 4 to operate the transmitter
• Tools: selection of allen tools and screw-drivers
• Degreaser

Recommended materials

• Hobby knife
• Side cutter and nose plier
• Cleaning brush and towel
• Camber gauge
• Cleaning gum
• Thin bearing oil
• Transmission grease
• CA glue

Front components (left to right):

• Front wishbone
• Shocktower front
• Shockabsorbers
• Front bodymount
• Front camber link
• Steering servo
• Steering system
• Steering link
• Race-tyres
• Steeringblock

Center components:

• Center diff
• Air filter
• Throttle servo
• Receiver box
• Battery box
• Fuel tank
• Exhaust

Rear components (left to right):

• Rear wishbone
• Rear camber link
• Pull starter
• Engine .21
• Rear stabilizer
• Wing
• Rear bodymount
• Rear Shocktower
• Wing mount
• Shocks rear

Springs

By using a softer spring you will have more sag, more chassis roll/lean, more dive and a less responsive car this might be better on low-grip surfaces; by using a harder spring you have less sag, less body lean, less dive and a more responsive car. What to apply depends on driving style and grip-level surface. This is more suitable on high-grip surfaces.

Shock-angle

The angle at which the shocks are mounted create a different suspension feel; the more vertical, the harder it feels, the more horizontal, the softer it feels.

Oil

The viscosity of the shock-oil defines the dampening of the shockabsorber. Thinner oil will be softer, with slower response, thicker oil will be harder dampening with faster reponse. The dampening can also be fine-tuned by fitting other pistons with more or less holes, which is an optional.

Differential

You can make the gear differential harder or softer by using a different oil viscosity. Lighter oil will create a looser diff which increases rear traction on acceleration, but also more understeer, and a harder differential will decreases rear traction on acceleration, but also more on-throttle steering

Front anti-roll bar

By using a softer anti-roll bar you will have more sag, more chassis roll/lean, more dive and a less responsive car. But you will have more steering once you have entered the corner

Rear anti-roll bar

By using a softer anti-roll bar you will have more sag, more chassis roll/lean, more dive and a less responsive car. But you will have more rear traction and a more stable car

Toe adjustment: Front

Adjusted with the track-rods, make longer or shorter. More toe-in will create more steering, but less stability; toe-out will create a more stabile car, with less steering.

Toe adjustment: Rear

Adjusted with suspension blocks (optional). More toe-in will create more traction, more stability, but less speed. Less toe in will create a less stabile car, with less traction but higher speed.

Front camber

Using more negative camber in the front will give you more steering but also increases possible traction roll.

Rear camber

Using more negative camber in the rear will create more grip in the rear meaning also creating more understeer.

Front caster

Use optional caster blocks to change caster, more caster will create more steering but also increases possible traction roll. And less caster will create less steering but also decreases possible traction roll.

Wheel-base length

A longer car will be more stabile and react slower, a shorter car will be more nervous and more direct.

Gear-ratio

Spur and pinion: for correct gearmesh keep a pieces of notebook paper at hand, to put between the spur and pinion for correct mesh.

Ride-height

You can change the ride-height of the car, by applying more or less pre-load on the springs, turn the pre-load adjusters to set the desired height and keep left and right the same.

Comprehensive setup sheet with checkboxes and fields for:

Track Information:

• Driver
• Track
• Race
• Date
• City
• Country
• Track size (open/medium/tight)
• Temperature
• Track traction (high/medium/low)
• Air track
• Track surface (smooth/medium/bumpy)
• Laps
• Track type (hard packed/soft dirt/clay/blue groove/astro turf/grass)
• Best laptime
• Track condition (dry/dusty/wet)
• Quali result
• Race result

Setup Parameters:

• Steering block (plastic/alu)
• Caster block (plastic/alu)
• Steering bar (OPT 1/2/3)
• Servo saver spring (standard/hard)
• Rear camber insert
• Brace (plastic/alu)
• Wheelbase shims (1.25/2.5/3.75/5mm)
• Caster (10°/12°)
• Shock length at full droop
• Ride height (front/rear in mm)
• Hex adapter (-2mm/-1mm/0mm)
• Upright (plastic/alu)
• Anti rollbar (1.8mm/2.0mm/2.3mm/2.5mm/2.7mm)
• Front camber
• Rear camber
• Wing location
• Spindle (high/low)
• Front toe settings
• Differential oil viscosity
• Shocks (front/center/rear oil and rebound %)
• Differential oil with CST values
• Gearing (clutch bell T/spur gear T)
• Clutch type and settings
• Brake balancers
• Tyres
• Body
• Engine type, manifold, muffler, plug, fuel

Shockabsorbers

• Check for smooth operation of the shockabsorbers, and check for airbubbles by pushing the shock up and down fast after removal of the spring. Clean the shockabsorbers as needed and refill with fresh 100% pure silicone oil as needed.

Tyres

• Replace tyres if case worn or damaged, and clean the surface in case dirty to obtain better grip.

Wheel-axles and driveshafts

• Remove the wheels, and check the wheel-axles, driveshafts and adaptors for dirt, play and pins. Clean thoroughly as needed and lubricate the touching parts with a small amount of grease or oil.

Differentials

• Check the differentials and gears for wear and dirt and clean as needed. Check the functionning of the diff by turning the wheels in opposite direction and feel if still smooth or 'gritty'. In case of gritty feel, the silicone oil may need replacement.

Full Assembly Manual

The full assembly manual of this model is available online; check on www.serpent.com and type your modelnumber, partnumber, or select your car from the car-page; go to the download section in the menu and download the full manual.

600003 Serpent 811 Cobra Buggy-RTR

Manual & Decals

• 600329 Decal sheet S811 black/white (2)
• 600332 Decal sheet S811 chrome (2)

Ball Bearings

• 1311 Ballbearing 5x8x2 (2)
• 1312 Ballbearing 5x8 flanged SS (2)
• 1315 Ballbearing 5x10x4 SS (2)
• 1321 Ballbearing 6x10x3 SS (2)
• 1337 Ballbearing 15x21x4 SS (2)
• 1393 Ballbearing 13X19X4 SS (2)
• 1394 Ballbearing 8x14x4 flanged SS (2)
• 1395 Ballbearing 8x19x6 SS (2)
• 1396 Ballbearing 8x16x5 SS (2)
• 600322 Bearingset S811 (32)
• 600435 Bearingset small S811 (14)

Radio Installation / Battery

• 1606 Antenna rod black (2)
• 1639 Collar alu + setscrew (4)
• 600121 Brake levers / adjusters
• 600127 Throttle / steering lever set
• 600131 Balljoint set (19)
• 600157 Collar double (2)
• 600207 Rod steering servo 26mm
• 600333 Brake / Throttle links (2)
• 600358 Radiobox V2 (3)
• 600359 Servo lever / mounts V2 (30)
• 600360 Throttle lever shaft (1)
• 600361 Throttle balls (2+1)
• 600362 Collar set V2 (3)
• 600363 Throttle rod V2 (1)
• 600500 Servo spacers (8)
• 804181 Throttle spring (2)

Radio Installation / Battery option

• 600272 Steering servo rod titanium
• 600290 Servo lever steering 23T alu
• 600291 Servo lever steering 24T alu
• 600292 Servo lever steering 25T alu
• 600293 Servo lever throttle 23T alu
• 600294 Servo lever throttle 24T alu
• 600295 Servo lever throttle 25T alu

Servo Saver & Steering

• 600105 Servosaver spring
• 600109 O-ring servosaver nut (4)
• 600128 Servo saver set nylon (3)
• 600131 Balljoint set (19)
• 600167 Steeringrack mount
• 600169 Servosaver adjust nut
• 600170 Servosaver shaft outer
• 600207 Rod steering servo 26mm
• 600554 Pivot ball steering short 811-S (2)
• 600555 Pivot ball steering long 811-S (4)
• 600556 Servo saver post 811-S (2)
• 600557 Steeringrack alu 811-S
• 600558 Topdeck front 811-S

Servo Saver & Steering option

• 600153 Topdeck front carbon
• 600171 Steeringrack option 1
• 600172 Steeringrack option 2
• 600173 Steeringrack option 3
• 600272 Steering servo rod titanium
• 600278 Servo saver post alu (2)
• 600296 Servosaver alu coated (3)
• 600330 Servo saver spring hard

Fuel tank and parts

• 1493 Prussure nipple m3 (4)
• 1494 Silicone tubing 2x5x50 white
• 600115 Tank mounting rubber (4)
• 600116 O-ring tank (4)
• 600117 Tank cap seal silicone (2)
• 600123 Clip /plug set for fuel tube (6)
• 600142 Tank 125cc with filter
• 600335 Post fuel tank (2)

Shock Absorbers

• 600111 Shock membrane (10)
• 600112 O-ring shock bottom (10)
• 600113 O-ring shock nut (10)
• 600118 Shock part frame nylon (10)
• 600145 Shock pistons (4x4)
• 600158 Adjust nut shock / oring (2)
• 600180 Washer shock shaft (4)
• 600184 Pivotball 6.75 double (4)
• 600194 Shockshaft FR (2)
• 600640 Shock shaft RR 811 2.0 (2)
• 600234 Shock cartridge stepped (4)
• 600235 Shock cartridge (4)
• 600319 Shock revision set (20)
• 600568 Shock mount 811-S (2)
• 600570 Shock set FR 811-S (2)
• 600571 Shock set RR 811-S (2)
• 600573 Shock top 811-S (2)
• 600574 Shock top nut 811-S (2)
• 600575 Shock body FR 811-S (2)
• 600576 Shock body RR 811-S (2)
• 600577 Shock shim 811-S (10)

Shock Absorbers option

• 600357 Membrane webbed silicone (4)
• 600287 Shock spring support alu (4)
• 600306 Shock shaft FR TiN coating (2)
• 600645 Shockrod 811 2.0 rear Tin coated (2)

Shock Springs

• 600648 Spring FR pink V2 (0.73N/4.15LB) (2)
• 600654 Spring RR pink V2 (0.58N/3.3LB) (2)
• 600646 Spring FR orange V2 (0.66N/3.8LB) (2)
• 600647 Spring FR red V2 (0.70N/4.0LB) (2)
• 600649 Spring FR blue V2 (0.75N/4.3LB) (2)
• 600650 Spring FR purple V2 (0.79N/4.5LB) (2)
• 600651 Spring FR green V2 (0.81N/4.65LB) (2)
• 600652 Spring RR orange V2 (0.53N/3.0LB) (2)
• 600653 Spring RR red V2 (0.56N/3.2LB) (2)
• 600655 Spring RR blue V2 (0.60N/3.4LB) (2)
• 600656 Spring RR purple V2 (0.61N/3.5LB) (2)
• 600657 Spring RR green V2 (0.63N/3.6LB) (2)
• 600658 Spring set FR V2 (6x2)
• 600659 Spring set RR V2 (6x2)

Chassis / Guards

• 600122 Brace front / rear nylon
• 600139 Sideguard L+R
• 600141 Bumper
• 600529 Chassis alu 811-S

Chassis / Guards Optional

• 600140 Mudguard L+R
• 600288 Chassis brace front alu
• 600289 Chassis brace rear alu
• 600469 Chassis S811 hard anodized

Front Section

• 600124 Bodymount FR+RR
• 600126 Washer/nut nylon M3 (12+15)
• 600129 Diff case front set
• 600131 Balljoint set (19)
• 600135 Wishbone front L+R
• 600136 C-Hub 10 L+R
• 600167 Steeringrack mount
• 600183 Bushing suspensionarm (4)
• 600193 Pivotball threaded antirollbar (2)
• 600197 Driveshaft insert (2)
• 600222 Wheelnut 17mm (4)
• 600223 Wheelhexagon (4)
• 600365 Spacers 1.25mm + 2.5mm wheelbase (4+2)
• 600481 Steeringblock L+R V2
• 600503 Steeringblock-wheelaxle set 811 V2

Front Section (continued)

• 600530 Shocktower front alu 811-S
• 600532 Gear coupler 811-S
• 600533 Driveshaft center FR 811-S
• 600535 Driveshaft FR 811-S (2)
• 600537 Wheelaxle FR 811-S (2)
• 600539 Pin steeringblock 811-S (4)
• 600540 Track rod FR 811-S (2)
• 600542 Track rod steering 811-S (2)
• 600543 Hinge pin 811-S (2)
• 600544 Antirollbar nut 811-S (4)
• 600545 Antirollbar bushing 811-S (4)
• 600546 Pivot ball antiroll bar 811-S (2)
• 600548 Suspension bracket FR-FR 811-S
• 600549 Suspension bracket FR-RR 811-S
• 600553 Pivot ball 7.5 double 811-S (4)
• 600554 Pivot ball steering short 811-S (2)
• 600558 Topdeck front 811-S
• 903343 Antirollbar Spacer 3mm (2)

Front Section Optional

• 600151 Shocktower front carbon
• 600153 Topdeck front carbon
• 600176 Suspension bracket alu FR RR std
• 600177 Suspension bracket alu FR FR std
• 600240 Antiroll bar front 2.3mm
• 600241 Antiroll bar front 2.5mm
• 600242 Antiroll bar front 2.7mm
• 600263 Washer M3 alu (12)
• 600284 Shocktower FR alu light
• 600297 Lightwheight wheel nut 17mm (4)
• 600303 C-hub 10 L+R alu
• 600304 C-hub 12 L+R alu
• 600336 Antiroll bar front 1.8mm
• 600337 Antiroll bar front 2.0mm
• 600497 Steeringblock L+R V2 alu

Middle Section

• 600100 Exhaust mounting wire (2)
• 600119 Center diff holder parts (3)
• 600131 Balljoint set (19)
• 600166 Exhaust mount alu
• 600197 Driveshaft insert (2)
• 600203 Brake plate (4)
• 600236 Airfilter boot
• 600243 Airfilter + foam
• 600340 Airfilter foam set inner-outer (6)
• 600341 Airfilter foam set inner-outer (10)
• 600369 Brake plate thick (2)
• 600524 Brake disk 811-S (2)
• 600525 Brake lever insert 811-S (2)
• 600526 Brake piston 811-S (2)
• 600527 Brake excenter 811-S (2)
• 600528 Brake plate mount set 811-S (2)
• 600532 Gear coupler 811-S
• 600569 Engine mount 811-S (2)
• 600683 Spur gear 48T 811-S

Middle Section Option

• 600148 Diskbrake front fibreglass
• 600149 Diskbrake rear fibreglass
• 600198 Spurgear 46T
• 600279 Spurgear 44T
• 600280 Spurgear 48T
• 600281 Brake piston /spring (2/2/2)
• 600286 Center diff holder alu (2)
• 600299 Engine monomount-set alu
• 600342 Mono enginemount top (2)
• 600345 Brake set pro

Rear Section

• 600124 Bodymount FR+RR
• 600126 Washer/nut nylon M3 (12+15)
• 600130 Diff case rear set
• 600131 Balljoint set (19)
• 600133 Wing mount set
• 600143 Wing white nylon
• 600193 Pivotball threaded antirollbar (2)
• 600222 Wheelnut 17mm (4)
• 600365 Spacers 1,25mm + 2,5mm for wheelbase (4+2)
• 600365 Spacers 1.25mm + 2.5mm wheelbase (4+2)
• 600499 Pivotball double straight (3)
• 600531 Shocktower rear alu 811-S
• 600534 Driveshaft center RR 811-S
• 600541 Track rod RR 811-S (2)
• 600543 Hinge pin 811-S (2)
• 600544 Antirollbar nut 811-S (4)
• 600545 Antirollbar bushing 811-S (4)
• 600546 Pivot ball antiroll bar 811-S (2)
• 600547 Hinge pin RR outer 811-S (2)
• 600550 Suspension bracket RR-FR 811-S
• 600551 Suspension bracket RR-RR 811-S
• 600552 Transmission brace mount RR 811-S
• 600553 Pivot ball 7.5 double 811-S (4)
• 600633 Wishbone rear L+R 811 2.0
• 600634 Upright L+R 811 2.0
• 600641 Hex adaptor -2mm (2)
• 600679 Driveshaft RR 811 2.0 S (2)
• 600680 Wheelaxle RR 811 2.0 S (2)
• 903343 Antirollbar Spacer 3mm (2)

Rear Section option

• 600155 Suspension bracket RR RR 3
• 600156 Suspension bracket RR FR 2
• 600237 Antiroll bar rear 2.3mm
• 600238 Antiroll bar rear 2.5mm
• 600239 Antiroll bar rear 2.7mm
• 600263 Washer M3 alu (12)
• 600265 Suspension bracket RR FR 2.5 - 4.5
• 600266 Suspension bracket RR RR HR 3
• 600267 Suspension bracket RR RR LR 3
• 600277 Wing black nylon
• 600285 Shocktower RR alu light
• 600297 Lightwheight wheel nut 17mm (4)
• 600300 Post wingmount alu (2)
• 600301 Wing washer alu (2)
• 600338 Antiroll bar rear 1.8mm
• 600339 Antiroll bar rear 2.0mm
• 600434 Antiroll bar rear 2.4mm
• 600439 Wing white low 811
• 600637 Shocktower carbon RR 811 2.0
• 600661 Upright L+R 811 2.0 alu

Screws - Allen Countersunk

• 110100: Screw allen countersunk m3x10 (10)
• 110101: Screw allen countersunk m4x8 (10)
• 110102: Screw allen countersunk m4x10 (10)
• 110103: Screw allen countersunk m4x16 (10)
• 110104: Screw allen countersunk M3x8 (10)
• 110105: Screw allen countersunk m4x12 (10)
• 110122: Screw allen countersunk m3x6 (10)
• 110124: Screw allen countersunk m3x8 (10)
• 110125: Screw allen countersunk m3x20 (10)
• 110126: Screw allen countersunk m2.5x12 (10)
• 110127: Screw allen countersunk m3x12 (10)
• 110132: Screw allen countersunk m3x16 (10)
• 110135: Screw allen countersunk M2.5x10 (10)
• 110136: Screw allen countersunk M2.5x8 (10)
• 110138: Screw allen countersunk M4x14 (10)
• 110139: Screw allen countersunk M3x40 (10)
• 110156: Screw allen countersunk M2.2x6 (10)
• 110157: Screw allen countersunk M3x5 (10)
• 110158: Screw allen countersunk M3x15 (10)
• 110159: Screw allen countersunk M3x18 (10)
• 110166: Screw allen countersunk M2.5x5 (10)
• 110173: Screw ph countersunk widethread 2.5x12 (10)
• 110174: Screw allen countersunk M4x6 (10)

Screws - Allen Cylinderhead

• 110107: Screw allen cylinderhead m3x16 (10)
• 110129: Screw allen cylinderhead m3x10 (10)
• 110152: Screw allen cylinderhead M3x8 (10)
• 110160: Screw allen cylinderhead M2.2x12 (10)
• 110161: Screw allen cylinderhead M2x6 (10)
• 110165: Screw allen cylinderhead M2x5 (10)
• 110175: Screw allen cylinderhead M3x40 (10)
• 110176: Screw allen cylinderhead M3x18 (10)

Screws - Allen Roundhead

• 110108: Screw allen roundhead m3x6 (10)
• 110109: Screw allen roundhead m3x10 (10)
• 110110: Screw allen roundhead m3x16 (10)
• 110111: Screw allen roundhead m3x14 (10)
• 110112: Screw allen roundhead m3x12 (10)
• 110113: Screw allen roundhead m4x8 (10)
• 110128: Screw allen roundhead m3x5 (10)
• 110130: Screw allen roundhead m2.5x6 (10)
• 110131: Screw allen roundhead m2.5x10 (10)
• 110140: Screw allen roundhead M3x20 (10)
• 110141: Screw allen roundhead M3x22 (10)
• 110142: Screw allen roundhead M3x25 (10)
• 110143: Screw allen roundhead M4x18 (10)
• 110144: Screw allen roundhead M3x18 (10)
• 110153: Screw allen roundhead M2.3x6 (10)
• 110164: Screw allen roundhead M3x4 (10)

Screws - Flanged

• 110106: Screw allen flanged roundhead m5x12 (10)
• 110145: Screw allen roundhead flanged M3x12 (10)
• 110146: Screw allen roundhead flanged M3x16 (10)
• 110167: Screw allen roundhead flanged M3x18 (10)
• 110168: Screw allen roundhead flanged M3.5x10 (10)
• 110169: Screw allen roundhead flanged M4x10 (10)
• 110170: Screw allen roundhead flanged M3x28 (10)
• 110172: Screw allen roundhead flanged M3x6 (10)

Screws - Philips

• 110123: Screw philips roundhead 3.5x13 (10)
• 110133: Screw philipshead countersunk 2.5x8 wide (10)
• 110134: Screw philipshead countersunk 2.5x10 wide (10)
• 110147: Screw ph roundhead widethread 2.5x5 (10)
• 110171: Screw ph countersunk widethread 2.5x15 (10)

Setscrews - Allen

• 110114: Setscrew allen m3x8 (10)
• 110115: Setscrew allen m3x4 (10)
• 110116: Setscrew allen m3x3 (10)
• 110117: Setscrew allen m3x12 (10)
• 110118: Setscrew allen m4x4 (10)
• 110119: Setscrew allen m4x6 (10)
• 110120: Setscrew allen m4x10 (10)
• 110121: Setscrew allen m5x6 (10)
• 110137: Setscrew allen M3x6 (10)
• 110148: Setscrew allen M5x4 (10)
• 110154: Setscrew allen M3x10 (10)
• 110155: Setscrew allen M3x5 (10)
• 110162: Setscrew allen M3x2.5 (10)
• 110163: Setscrew allen M3x2 (10)

Pins

• 110200: Pin 2.5x8 (10)
• 110201: Pin 3x12 (10)
• 110202: Pin 5x5 (10)
• 110203: Pin 3x14 (10)
• 110204: Pin 3x20 (10)
• 110205: Pin 3x22 (10)
• 110206: Pin 2.5x22 (10)
• 110207: Pin 2.5x12 (10)
• 110208: Pin nra 2x9.8 (4)
• 110209: Pin nra 2x18 (4)
• 110210: Pin 3x13 (10)
• 110211: Pin 2.5x13 (10)
• 110212: Pin 2.5x17 (10)
• 110213: Pin 2.5x10 (10)
• 110214: Pin 3x15 (10)
• 110215: Pin 2x12 (10)
• 110216: Pin 2.5x15 (10)
• 110217: Pin 2x9 (10)
• 110218: Pin 3x10 (10)
• 110219: Pin 2x14 (10)

Clips and Fasteners

• 110300: E-clip 2.3 (10)
• 110301: E-clip 3.2 (10)
• 110302: E-clip 4.0 (10)
• 110303: E-clip 5.0 (10)
• 110304: E-clip 7.0 (10)
• 110305: Seger clip 12x1.0 (10)
• 110306: E-clip 6.0 (10)

Shims and Spacers

• 110400: Shim 6.0x10x0.2 (10)
• 110401: Shim 3.2x7x0.5 (10)
• 110404: Shim 6x8x0.3 (10)
• 110408: Shim 3x5x0.3 (10)
• 110409: Shim 3x5x1 (10)
• 110410: Shim 3x5x2 (10)
• 110411: Shim 3x5x4 (10)
• 110412: Shim 3.5x8x1 (10)
• 110413: Shim 3.5x12x0.2 (10)
• 110414: Shim 3x6x0.1 (10)
• 110415: Shim 3x6x0.5 (10)
• 110416: Shim 3x6x0.8 (10)
• 110417: Shim 3x6x3 (10)
• 110418: Shim 4x8x0.1 (10)
• 110419: Shim 4x9.5x1 (10)
• 110420: Shim 4x9.5x2 (10)
• 110421: Shim 4x9.5x4 (10)
• 110422: Shim 4x10x0.3 (10)
• 110423: Shim 5x8x0.1 (10)

Nuts

• 110402: Nut nylock M3 (10)
• 110403: Nut nylock M4 (10)
• 110405: Nut nylock M4 flanged (10)
• 110406: Nut nylock M2.2 (10)
• 110407: Nut M3 (10)
• 110437: Nut M2.5 (10)
• 110441: Nut nylock M3 flanged (10)
• 110444: Nut M4 nylon (10)

Shims and Spacers (continued)

• 110424: Shim 5x8x0.3 (10)
• 110425: Shim 5x10x0.3 (10)
• 110426: Shim 5x10x0.5 (10)
• 110427: Shim 5x15x0.3 (10)
• 110428: Shim 6.5x8x0.25 (10)
• 110429: Shim 6x11.75x0.2 (10)
• 110430: Shim 6x12x0.5 (10)
• 110431: Shim 8x11x0.1 (10)
• 110432: Shim 8x11x0.2 (10)
• 110433: Shim 12x15x0.25 (10)
• 110434: Shim 12x18x0.3 (10)
• 110435: Shim 13x16x0.2 (10)
• 110436: Shim 3x5x3 (10)
• 110438: Shim 2.5x6x0.5 (10)
• 110439: Shim 3x7.5x1 (10)
• 110440: Shim 2.5x5x0.4 (10)
• 110442: Shim 4x8x0.6 (10)
• 110443: Shim 5x15x0.2 (10)

Merchandising

Decals and Promotional Items

• 1891: Serpent medium promo decal 20x12.5 (2)
• 1892: Serpent windowshop decal 20x12.5 (2 sided)
• 1893: Serpent decal XL (30x60cm)
• 1895: Shopping-bag Serpent orange
• 1897: Towel Serpent large
• 1898: Lanyard Serpent orange
• 1900: Cap flat-brim Serpent black
• 1998: Cap serpent black-orange

Apparel - Hooded Sweaters

• 190110: Sweater hooded serpent black (S)
• 190111: Sweater hooded serpent black (M)
• 190112: Sweater hooded serpent black (L)
• 190113: Sweater hooded serpent black (XL)
• 190114: Sweater hooded serpent black (XXL)

Apparel - T-shirts (LTS White)

• 190121: T-shirt Serpent LTS white (S)
• 190122: T-shirt Serpent LTS white (M)
• 190123: T-shirt Serpent LTS white (L)
• 190124: T-shirt Serpent LTS white (XL)
• 190125: T-shirt Serpent LTS white (XXL)

Apparel - T-shirts (DTR Orange)

• 190127: T-shirt Serpent DTR orange (S)
• 190128: T-shirt Serpent DTR orange (M)
• 190129: T-shirt Serpent DTR orange (L)
• 190130: T-shirt Serpent DTR orange (XL)
• 190131: T-shirt Serpent DTR orange (XXL)

Apparel - T-shirts (DTR Black)

• 190132: T-shirt Serpent DTR black (S)
• 190133: T-shirt Serpent DTR black (M)
• 190134: T-shirt Serpent DTR black (L)
• 190135: T-shirt Serpent DTR black (XL)
• 190136: T-shirt Serpent DTR black (XXL)

Apparel - T-shirts (Offroad Orange)

• 190137: T-shirt Serpent offroad orange (S)
• 190138: T-shirt Serpent offroad orange (M)
• 190139: T-shirt Serpent offroad orange (L)
• 190140: T-shirt Serpent offroad orange (XL)
• 190141: T-shirt Serpent offroad orange (XXL)

Apparel - T-shirts (Offroad Black)

• 190142: T-shirt Serpent offroad black (S)
• 190143: T-shirt Serpent offroad black (M)
• 190144: T-shirt Serpent offroad black (L)
• 190145: T-shirt Serpent offroad black (XL)
• 190146: T-shirt Serpent offroad black (XXL)

Apparel - Polo Shirts

• 190156: Polo shirt Serpent black-orange (S)
• 190157: Polo shirt Serpent black-orange (M)
• 190158: Polo shirt Serpent black-orange (L)
• 190159: Polo shirt Serpent black-orange (XL)
• 190160: Polo shirt Serpent black-orange (XXL)
• 190161: Polo shirt Serpent black-orange (XXXL)

Apparel - T-shirts (Offroad White)

• 190162: T-shirt Serpent offroad white (S)
• 190163: T-shirt Serpent offroad white (M)
• 190164: T-shirt Serpent offroad white (L)
• 190165: T-shirt Serpent offroad white (XL)
• 190166: T-shirt Serpent offroad white (XXL)

Apparel - T-shirts (LTS Black)

• 190167: T-shirt Serpent LTS black (S)
• 190168: T-shirt Serpent LTS black (M)
• 190169: T-shirt Serpent LTS black (L)
• 190170: T-shirt Serpent LTS black (XL)
• 190171: T-shirt Serpent LTS black (XXL)

Apparel - Winter Jackets

• 190172: Winter jacket Serpent (S)
• 190173: Winter jacket Serpent (M)
• 190174: Winter jacket Serpent (L)
• 190175: Winter jacket Serpent (XL)
• 190176: Winter jacket Serpent (XXL)

Pit Equipment

• 190500: Pit-caddy
• 190501: Tool-bag
• 190502: Pit-bag medium. 3 drawers
• 190503: Fuel bottle 500ml
• 190504: Ballcup tool
• 190508: Toolset for OFFROAD (20pcs) with Tools bag
• 190509: Allen wrench 1.5 X 120MM
• 190510: Allen wrench 2.0 X 120MM
• 190511: Allen wrench 2.5 X 120MM
• 190512: Allen wrench 3.0 X 120MM
• 190513: Ball driver hex wrench 2.0 X 120MM
• 190514: Ball driver hex wrench 2.5 X 120MM
• 190515: Ball driver hex wrench 3.0 X 120MM
• 190516: Tool tip Allen wrench 1.5 X 120MM
• 190517: Tool tip Allen wrench 2.0 X 120MM
• 190518: Tool tip Allen wrench 2.5 X 120MM
• 190519: Tool tip Allen wrench 3.0 X 120MM
• 190520: Tool tip Ball driver hex wrench 2.0 X 120MM
• 190521: Tool tip Ball driver hex wrench 2.5 X 120MM
• 190522: Tool tip Ball driver hex wrench 3.0 X 120MM
• 190523: Turnbuckle wrench 3MM
• 190524: Turnbuckle wrench 4MM
• 190525: Turnbuckle wrench 5MM
• 190526: Flat head screwdriver 3.0 X 150MM
• 190527: Flat head screwdriver 4.0 X 150MM
• 190528: Phillips screwdriver 2.0 X 45MM
• 190529: Phillips screwdriver 3.5 X 120MM
• 190530: Phillips screwdriver 5.8 X 120MM
• 190531: Nut driver 5.0 X 100MM
• 190532: Nut driver 5.5 X 100MM
• 190533: Nut driver 7.0 X 100MM
• 190534: Reamer with end cap for lexan body
• 190535: Exhaust spring / caster clip remover
• 190536: Wrench-glowplug / clutchbell - 10MM LONG
• 190537: Flywheel wrench tool wheel nut for 1/8 OFF ROAD Buggy
• 190538: Flywheel wrench

Dragon RC

• 210000: Transmitter set DTS-1 with display 2.4 Ghz
• 210001: Transmitter DTS-1 with display 2.4Ghz
• 210002: Receiver DRS-1 on 2.4Ghz
• 210003: Servo digital 0.19s/10.5kg MG
• 210005: Servo case for #210003
• 210007: Servo gear set for #210003

Engine, Pipe

• 130001: Serpent .21 pullstart engine
• 130002: Serpent .21 pullstart system
• 130003: Serpent .21 pullstart oneway
• 130004: .21 Pipeset polished Inline
• 130005: .21 Pipe polished
• 130006: .21 Manifold polished OFR

Tyres, Rubber Offroad and Wheels

• 214001: 1/8 buggy tyre hard mounted on white rim (2)
• 214002: 1/8 buggy tyre med mounted on white rim (2)
• 214003: 1/8 buggy tyre soft mounted on white rim (2)
• 214004: 1/8 buggy tyre s-soft mounted on white rim (2)
• 214005: 1/8 buggy tyre hard (2)
• 214006: 1/8 buggy tyre med (2)
• 214007: 1/8 buggy tyre soft (2)
• 214008: 1/8 buggy tyre s-soft (2)
• 214009: 1/8 moulded insert hard (4)
• 214010: 1/8 moulded insert med (4)
• 214011: 1/8 moulded insert soft (4)
• 214012: 1/8 moulded insert s-soft (4)

This page shows exploded diagrams of the front and rear differential assemblies, with detailed part numbers labeling each component. The front differential, rear differential, and center transmission are illustrated with the following key parts identified:

• Front Differential: Shows the differential housing, gears, bearings, shims, and fasteners arranged in assembly order
• Rear Differential: Similar arrangement to the front, with specific gearing configuration
• Center Transmission: Illustrates the central drive system with its specific gear arrangement and support components

Part numbers visible in the assembly diagrams include references to:

• Diff housings and cases
• Spiral gears and differential gears
• Bearings and bearing supports
• Shims for alignment
• Drive pins and fasteners

Note: Refer to the parts list sections for complete part number descriptions and quantities.

This page presents a detailed exploded view of the center differential assembly, showing how all components fit together. The assembly illustrates:

• Center diff case and housing structure
• Brake disk components with yellow/green colored disks
• Differential gears and pinion arrangement
• Brake lever inserts and excenter components
• Mounting plates and fasteners
• Brake piston assembly
• Suspension integration points

Key components identified in the assembly include brake system integration, allowing the driver to control the differential lock-up for improved traction during turns and acceleration.

This page shows the complete rear suspension and drivetrain assembly in exploded detail, including:

• Rear Shock Towers: Upper and lower mounting points
• Suspension Components: Rear wishbones, suspension arms, and mounting brackets
• Differential Assembly: Rear differential case with gears and housing
• Driveshafts: Center and outer rear driveshafts with couplers
• Brake System: Brake plates, pistons, and levers
• Anti-roll Bar: Suspension stabilizer components
• Shock Absorbers: Complete shock assembly with springs
• Wheel Assembly: Rear wheel axles and mounting hardware
• Wing Mount: Rear wing support structure

All components are labeled with part numbers for identification and replacement purposes.

This page displays the complete front suspension and steering assembly in detailed exploded view, including:

• Shock Towers: Front mounting structure
• Steering System: Servo mounting, steering links, and steering block assembly
• Suspension Arms: Front wishbones and suspension brackets
• Differential Housing: Front differential case
• Driveshafts: Front driveshaft with coupler and center sections
• Steering Servo: Servo housing with linkage and adjusters
• Shock Absorbers: Complete front shock assembly
• Wheel Assembly: Front wheel axles and steering block integration
• Anti-roll Bar: Front suspension stabilizer components

All parts are clearly labeled with corresponding part numbers for easy identification and assembly reference.

This page shows the complete steering system assembly in exploded detail, featuring:

• Servo Saver: Spring-loaded system to protect the servo from impact
• Steering Links: Ball-jointed rods connecting servo to steering blocks
• Steering Blocks: Left and right steering components with integrated wheel mounting
• Servo Mounting: Digital servo installation with levers and adjusters
• Top Deck: Steering support structure
• Pivot Balls: Steering linkage connection points
• Servo Levers: Control arms for steering actuation

All steering components are labeled with part numbers for identification and potential upgrades.

SHOCK ASSEMBLY

This page displays the complete shock absorber assembly, showing:

• Shock Bodies: Front and rear shock cartridges with color-coded springs
• Pistons: Shock piston plates with damping holes
• Shock Shafts: Spring support rods
• Springs: Color-coded for different stiffness ratings
• Bushings and Seals: O-rings and friction components
• Fasteners: Hardware for assembly

The shock assembly can be customized by changing springs, oil viscosity, and piston configurations for different driving conditions.

This page presents the clutch system assembly, showing:

• Flywheel: 3-pin design with bearing support
• Clutch Shoes: Carbon material components for friction
• Clutch Springs: Engagement and disengagement springs
• Clutch Bell: Housing for the complete assembly
• Bearing Support: Lower assembly base

The clutch system allows the engine to engage and disengage from the drivetrain for proper vehicle control.

RADIO ASSEMBLY

This page illustrates the complete radio control system installation, including:

• Receiver Box: Housing for radio receiver and battery connections
• Antenna: Receiver antenna rod for signal reception
• Servo Installation: Steering and throttle servo mounting
• Throttle Linkage: Mechanical connection from servo to carburetor
• Brake System: Brake lever and adjustment components
• Radio Box: Protected enclosure for receiver and battery
• Body Mounting: Integration with the chassis and body

All radio components and linkages are labeled for proper installation and adjustment.

This page shows the complete assembly of the Serpent 811 Cobra RTR, with all major systems integrated:

• Engine: Novarossi .21 cubic inch pullstart engine mounted centrally
• Fuel Tank: 125cc capacity with mounting rubbers
• Radio Box: Receiver and battery installation
• Shocks: Front and rear shock absorbers with springs
• Differential: Center differential with brake system
• Wheels and Tires: Dragon-RC racing tires on white rims
• Driveshafts: All drive train connections
• Air Filter: Engine air intake system
• Exhaust: Exhaust pipe and muffler system
• Wing: Rear stabilizer wing with mounting hardware

The completed vehicle is ready for operation after fuel, battery charging, and servo calibration are completed.

NOTES

This section is provided for user documentation and service notes.

Serpent

• Website: www.serpent.com
• Email: [email protected]

Dragon-RC

• Website: www.dragon-rc.com

Document Information

Reference: #82354-1 Manual / ref guide 811B RTR

Product Link: www.serpent.com/600003

Brands: Serpent, Dragon-RC and Novarossi are registered brandnames.

For more information about replacement parts, assembly guides, and technical support, visit the official Serpent website or contact your authorized dealer.