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RCScrapyard Radio Controlled Models
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1/12 Scale Electric Truck/Truggy:

AYK Bun Bun Off Roader (Radio Controlled Model)


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History + Information (and How To Set-up Tips):


  Introduced by AYK Aoyagi Metals Co circa 1989, the 2WD Bun Bun Off-Roader was a fun car with a Mitsubishi Pajero bodyshell.

  The model is based on a double deck type chassis, with a rheostat type servo operated speed controller, 540 motor and plastic gears.

AYK Bun Bun Off Roader
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  To race the AYK Bun Bun Off Roader, it requires a high level of tuning for improved stability when cornering, to keep it on the track and give you more grip under acceleration. Even the smallest change in your cars settings can make a Big difference. Our simple to follow instruction chart will show how to attain the best Set-up for your personal requirements.

  With simple to follow language, we can point you towards the correct Electric Motor for your Bun Bun Off Roader and achieve the best Gearing, for your battery and motor combination.

  Learn the secrets the professionals have known for years to get the best from their Bearings using a number of simple tips. See how you can easily avert Radio interference, and the best way to safely Charge your Batteries, for improved acceleration and more run time.









Gas/Nitro Engines Body Shells Radio Transmitters etc Tires Wheels/Rims Electronic Speed Controllers Battery Packs / Chargers Electric Motors












Items For Sale:






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★ AYK Bun Bun Off Roader Mitsubishi Pajero ★
AYK Bun Bun Off Roader Mitsubishi Pajero

★ AYK Bun Bun Off Roader Chassis ★
AYK Bun Bun Off Roader Chassis


General Information and Advice

   For those starting in Radio Controlled Racing, here are a few Hints and Tips: Firstly, buy a Kit not an RTR. That way, if something breaks you will have some idea how to fix it.

   Radio Controlled Model Cars are very fragile and easily broken. The main parts to protect are the Front Wishbones, Suspension Shock Towers, Dampers, Hub Carriers, Kingpins, Uprights and Toe in Blocks, so make sure you have a good strong front bumper and Lexan or Hard Plastic Body Shell and if available for your model, a protective under tray, to prevent grit and dust getting into any moving parts.

   The Steering Servo is also a weakness in high speed crash situations, so get yourself some good strong Servo Mount and Servo Saver. Also I would recommend Titanium Shafts, Turnbuckles, Tie Rods and pivot/steering shafts and if available for your model, lightweight Titanium Drive shafts, dog bones and CVD (Constant Velocity Drives). The standard steel types are far too easily bent.

   Gearing is another problem area on RC model cars. Head on collisions can easily break off gear teeth on Nylon/Plastic Spur Gears and even Bevel Gears inside the Gearbox. Heavy impacts can also loosen nuts and self taping screws that hold the Motor in Position, allowing the Pinion Gear to pull out of mesh slightly and rip the tops of the teeth on your Spur Gear. To avoid this to some degree, fit locking nuts and a new motor mount from time to time, so the self taping screws that hold the motor in position have less chance to come loose.

   Ball joints always cause problems. For top level Radio Controlled model car racing, the plastic ball connectors should be checked and if deemed necessary changed after every meeting. A simple thing like a loose fitting connector breaking free could easily end your race, so better safe than sorry.

   Many New car kits come with Nylon and Sintered Brass Ring type bearings. My advice is to discard these before initial installation and buy a good Hop-up set of Shielded Steel Ball Bearings. Or if you are serious about your racing, Teflon or Ceramic Bearings.

   One final piece of advice about the Setup of your Car. Keep the Centre of Gravity as low as possible. Ride Height is all important. For On Road Drift/Touring cars the Ride Height should be no more than 5mm, for Buggys, Trucks, Truggys and Monster Trucks, as low as possible depending on the track conditions. If Body Roll is a problem, handling can be improved with the use of Stabilizers, Anti roll or Sway Bars, stiffer Tuning Springs and, or thicker Silicon Oil in the Dampers. Also find somewhere to mount the Transponder as low in the Chassis as possible.

For Car Setup Information check out our Hints and Tips page.

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Manufacturers and Brands Catalogued and Listed by RC-Scrapyard.


   At present, the RC Model Manufacturers, Brands and Distributors covered by us are: ABC Hobby, Academy, Acme Racing, Agama Racing, Amewi, Ansmann Racing, ARRMA, Team Associated, Atomic RC, Axial, AYK, Bolink, BSD Racing, Capricorn, Carisma, Carson, Caster Racing, Cen, Corally, Custom Works, Durango, Duratrax, ECX - Electrix, Exceed RC, FG Modellsport, FS-Racing, FTX, Fujimi, Gmade, GS-Racing, Harm, HBX, Helion, Heng Long, Himoto Racing, Hirobo, Hitari, Hobao, Hong-Nor, Hot Bodies, HPI, HSP, Intech, Integy, Jamara, JQ Products, Kawada, Kyosho, Losi, LRP, Maisto, Mardave, Marui, Maverick, MCD Racing, Megatech, Mugen, New Bright, Nichimo, Nikko, Nkok, Ofna, Pro-Pulse, Protech, PTI, RC4WD, Redcat Racing, RJ-Speed, Robitronic, Schumacher, Seben, Serpent, Smartech, Sportwerks, Step-Up, Tamiya, Team-C Racing, Team Magic, Thunder Tiger, Tomy, Top Racing, Traxxas, Trinity, Tyco, Vaterra RC, Venom, VRX Racing, WLToys, X-Factory, Xmods, Xpress, Xray, XTM, Yankee RC, Yokomo, ZD Racing and Zipzaps.

   This is an ongoing project, with new and "lost in time" RC Model Brands being added as they are found and although most of those listed above have been covered in relative detail, some are still being researched and will be completed in the near future.


















Hints and Tips


How to Charge Rechargeable Batteries
for Radio Controlled Models

Ni-Cad (Nickel Cadmium) Batteries


1/  All Ni-Cad Batteries have to be Discharged soon after use. This is to avoid the dreaded "Memory" effect that on subsequent re-charges can cause a momentary drop in performance during a race. A simple discharger can be made from a car 12v bulb.

2/  Try to time your charge to complete just before a race. This will ensure maximum punch and duration. If a Ni-Cad is left to cool after a charge this advantage dissipates.

3/  The higher the charge current the more Punch the Ni-Cad battery will have (up to around 8 amps), however, the downside to this is a reduction in duration and effective battery life.

4/  Ni-Cad Batteries should be left to cool for about an hour after use before recharging. This will increase the effective life of the battery.


Ni-Mh (Nickel Metal Hydride) Batteries


1/  Never charge Ni-Mh batteries at a current higher than 4.5 amps. Although these batteries can give a higher voltage than Ni-Cad Batteries, they are much more sensitive and easy to damage if charged too quickly.

2/  Charging methods for Ni-Mh batteries can also be detrimental. The best I found was the "Slope" method. Avoid "Pulse" charging as this tends to effect crystal formation detrimentally and (it seems to kill them off) thus reduces duration over time.

3/  If using a temperature cut off charger on Ni-Mh batteries set to no more than 40 Degrees Centigrade. Any higher than this can damage the crystals.

4/  It is not necessary to discharge Ni-Mh Batteries. Unlike Ni-Cad batteries they do not develop a memory. Also, if they are totally discharged they sometimes will not charge straight after and need to be coaxed with a 10 minute trickle charge.

5/  Ni Mh Batteries can be recharged shortly after use without any discernable detrimental effects.


Li-Po (Lithium-Polymer) Batteries


1/  Li-Po batteries are a huge step forward in performance compared with Ni-Cad and Ni-Mh batteries. However, care has to be taken when charging. If certain procedures are not followed they could burst into flames or even explode, therefore I do not recommend Li-Po batteries for RC beginners.

2/  Li-Po batteries are more expensive and have a shorter effective life. Generally considered to be between 200 to 400 charge cycles compared to 1000+ for Ni-Cad and Ni-Mh.

3/  Consider a Battery pack listed as "2S 5000Mah 40c 2C".
"2S" is the number of cells in the pack, in this case 2 cells. Each cell provides around 3.7 Volts, so a 2S pack is around 7.4 Volts.
"5000Mah" (Mili-Amp-Hours) is the capacity. The amount of charge the pack can hold.
"40c" is the maximum Discharge rate. Which in our example would be calculated as 5000 (Mah) x 40 = 200000Ma (200 Amps).
"2C" is the maximum Charge rate. 1C being 5 Amps, so in our example 2 x 5 = 10 Amps.

4/  To safely charge your Li-Po Battery I would recommend a good Computerised charger, preferably one that can handle a Charge current of around 25A and always place the charging battery on a fireproof surface.

5/  Finally. NEVER leave your charging Li-Po battery unattended and NEVER EVER charge it above the recommended rate. When not in use, store with around 60% charge remaining in a fireproof box.


For More Setup Information check out my Hints and Tips page.







Hints and Tips

Servo Information

   Servos are found on all kinds of Radio Controlled Models. RC Touring Cars, Buggys, Trucks, Truggys, Monster Trucks, Rock Crawlers, Airplanes, Helicopters, Boats and Ships for Steering, Throttle Control, Rudder Operation and Wing Flaps.

   For complete RC beginners, choosing the right servo can be confusing, so here are a few tips to point you in the right direction.

   The standard, plastic bushed (bearings) type servos are fine to start with but come with plastic/nylon gears that can break easily in collisions. So, to protect your servo gears to some degree, make sure you have a good "servo saver".

   Servo Savers come in a number of forms and are often included as standard on some RC Models. The best ones, in my opinion, are those that use a small spring to absorb the shock of the crash and are simply fitted in place of the servo horn.

   For lightweight, small scale models, plastic geared servos are fine. But for medium to large scale RC models, I would recommend metal or titanium gear servos. These servos are by nature heavier and more costly than the plastic geared ones but are well worth the extra expense, for obvious reasons.

   Digitally controlled Servos use a microprocessor based controller board. They are generally faster, provide better torque and centralise more accurately than the older Analogue types, but again at a higher cost.

   As you advance in experience and skill, you might feel the need for something to match your lightning reflexes. Mos-FET, or simply FET Servos use Ball bearings and will provide the high speed response you crave, but at a price. However, if your budget will stretch to the higher cost, the improvement in performance can make a big difference.

For More Setup Information check out my Hints and Tips page.










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