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1/8 Scale Nitro Truck/Truggy:

Jamara X2-CRT (Radio Controlled Model)


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History, Info (and How To Set-up Tips) for the X2-CRT:


  Developed by Jammin Products, manufactured by Hong-Nor and distributed by Jamara circa 2008, the 4WD X2 CRT Truggy - # 057560 - was shaft driven, on an alloy plate chassis, with 3 x gear type differentials, coil spring over oil filled dampers, anti roll bars, all round CVD universal joint drive-shafts and a full set of ball bearings.

  The model was also distributed in the USA by Ofna Racing.

Jamara X2-CRT
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  To race the Jamara X2-CRT, it must be fine tuned to improve handling, provide responsive steering and give you the grip to cruise around corners at high speed, without slipping off the track. Small adjustments can make a Big difference and our step by step procedure, will guide you to the best Set-up for your individual driving style.

  Our simple guide explains "run in" and what to look for as you tune the Nitro Engine for your X2-CRT.

  Using plain language, our guide will show you how to avoid Radio interference, and Servo Twitch, by positioning your radio receiver and implementing the latest innovations. Find out how to reduce friction and improve the performance of your Jamara X2-CRT Bearings with a few common sense hints and tips.









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Items For Sale:






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★ Jamara X2-CRT ★
Jamara X2-CRT

★ Jamara X2-CRT Chassis ★
Jamara X2-CRT Chassis


Buying a Used Jamara X2-CRT Truggy (and What to look for)


   Buying a used Jamara X2-CRT Nitro Truggy, or any used RC Model, has a number of advantages. It is generally cheaper than new, ready built and may come with a variety of expensive hop-ups already installed. Cheap, pre-loved bargains are always becoming available. However, depending on the age of your purchase, it may need a little tender loving care before you can take it out on the back yard.

   The one thing you will always need is an instruction manual. If not supplied with your purchase, they can often be downloaded from the Jamara website, or purchased separately on eBay. With an instruction manual, any problems with your model Truggy you may discover can easily be fixed.

Dampers
   When you receive your used Jamara Truggy, make a general visual inspection of the chassis, front and rear wishbones, suspension shock towers etc, for any broken parts that may need to be replaced. Then, take a screwdriver and box spanner and check each self tapping screw and nut for security, taking care not to over tighten.

   Next, for those Jamara models with oil filled shock absorbers, remove them from the chassis and dismantle the coil springs. The damper shafts should push in and pull out with a smooth action. If you feel a jolt as you change direction, this means the oil has leaked out and must be topped up. At the same time, change the O-Ring seals to prevent more leakage. Also check the damper shafts for damage. If they are scratched, change them as soon as possible.

   If the body shell of your Jamara X2-CRT is broken, ripped or damaged in any way, this can be easily repaired with rubber solution glue. Also, for added protection and if available for your X2-CRT model, fit an under guard to stop dirt and gravel entering the chassis.

Titanium Turnbuckles
   Examine the drive shafts for wear and replace as required. If possible, change them for titanium. The steel shafts wear and bend too easily.

   If you intend to race your X2-CRT Truggy model at a competitive level, I would also recommend you obtain and fit titanium pivot shafts, turnbuckles, tie rods and steering rods.

   The gearbox of your used Truggy should be opened up to check for gear wear and lubrication. A thin coat of grease is often used on internal gears and although this is fine for basic running around on the back yard, if you intend to race your Truggy at a higher level, this should be removed and replaced with racing oil (ZX1 or Teflon Oil). Of course, this should be reapplied after each race meeting.

Spur Gears
   Gears are a weakness on all Truggy RC models. Head on collisions can easily damage the gear teeth on nylon and plastic spur gears. Heavy impacts can also loosen the nuts or self tapping screws that hold the Nitro Engine in Position, allowing the pinion gear to pull out of mesh slightly and rip the tops off the teeth on your spur gear. To minimise this possibility, fit bolts with locking nuts to the Nitro Engine mount and remember to check them for security after every two or three runs.

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

Servo Gears
   The X2-CRT steering servo is also prone to damage. In high speed crash situations, the fragile gear teeth of the servo can be broken off, rendering your expensive servo useless, so be sure to obtain a good quality "Servo Saver". Check out my Servo Information article.

   If body roll on your Jamara X2-CRT is a problem, handling can be improved with the use of stabilizers, anti roll or sway bars, stiffer tuning springs and, or, thicker silicone oil in the dampers.

Ball Bearings
   If your used Jamara Truggy comes with plastic and sintered brass bushings (ring type bearings), check the shafts that run in them for wear. Dust and grit can get into these bearings and abrade the shafts. Therefore, you should replace them all with shielded ball bearings. If the model has been run with ring type bearings, you may have to change all the axles and driveshafts. For more information, take a look at my article, How to get the best from your Bearings.

   Finally, good luck with your X2-CRT model and good racing.


For More on how to Setup your Truggy, check out my 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

Ride Height

   To allow the suspension on any RC model to do its work properly it needs to settle in a position that is somewhere between it being able to react to any bumps and holes it may encounter on the track. To do this, it needs to be adjusted to somewhere in-between those limits. That position is termed the ride height and is generally measured with the car race ready, that means with the motor and battery etc installed and is the distance between the underside of the chassis and the ground.

   Simply speaking, determining ride height is dependent on the specific track conditions. For off road models the rule is simple, the bigger the bumps and the deeper the holes, the higher the ride height. On road, the closer the car is to the track, the better it will handle.

   For 1:10 Buggys I generally recommend a starting point for ride height at around 20mm. 1:10 Trucks and Truggys, 30mm upwards, depending on the wheel diameter. For On Road models, as low as possible, but normally the setting is around 5mm.

   Ride height doesn't just affect the way the car handles uneven track conditions, it also influences the way the car handles when cornering. For a stable car, body roll must be kept to a minimum and keeping the ride height low, is by far the best and easiest way to control it.

   Before you begin to set the ride height, it is best to make sure that each pair of shocks are exactly the same length, have the same spring type and same silicone oil weight. Also, if you don't have a ride height gauge of any kind, decide what height you want set your car to and prepare some kind of slip gauge to that dimension, a book, a pen, or anything that measures to what you want. I used an old square plastic servo mount, which was exactly 5mm for my touring car. It may be low tech, but it is just as accurate as any gauge you can buy.

   To set the ride height, the race ready car must be placed on a flat surface. Slide your slip gauge under the chassis and adjust the height by adding or removing tension to the damper springs. This is done on most models by using small C shaped clips, placed over the damper, above the springs, or on a number of top of the range models, this adjustment can be made by screwing a knurled nut on each threaded damper body. As a rule if the springs are compressed by more than 25% they should be replaced by stiffer springs. The gauge should just slide under the chassis on all four corners of the chassis.

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







Hints and Tips

Look after your Gears

   In RC there are a number of different gear teeth sizes we tend to use, based on two systems. Imperial and metric. The imperial system has sizes 24dp, 32dp, 48dp and 64dp. DP stands for Diametral Pitch and the number refers to the number of teeth per inch. The metric system has sizes 0.4m, 0.5m, 0.6m, 0.7m, 0.8m and 1m. M stands for Module and is the ratio of the reference diameter of the gear divided by the number of teeth.

   The different sizes are used basically for strength. 32dp gears larger than 64dp gears, therefore it stands to reason that the 32dp gears are by design stronger and for this reason are more commonly used on a number of entry level buggys and nitro models because of the higher torque levels involved. Also, the bigger the scale of the model, the stronger the teeth need to be.

   64dp and its metric equivalents are generally the choice of 1:10 electric on-road racers, because of its higher range of ratio options and smoother action in comparison to other sizes. On-road models are not as hard on the gears as off-road, so the weaker, small tooth size is not a problem.

   48dp and its metric equivalents tend to be preferred by 1:10 off-road racers, mainly because of their strength in comparison to the 64dp and smoother operation than 32dp. Off-road models need gears that can handle all the knocks and bangs, as well as heavy landings off high jumps.

   Setting your gears is the most important part of looking after your gears.

   Backlash is basically the gap between the teeth in mesh. The perfect gear setting must have a small amount of backlash. To achieve the best setting use a very thin sheet of plastic between the pinion and spur gear teeth as you press them into mesh. After tightening the motor mount screws, use your fingers to spin the spur gear and roll out the plastic sheet. If the setting is correct, there will be a small amount of movement (backlash) between the gear teeth before they catch. If the mesh is too deep, there will be no movement between the teeth, this will create friction and if you run them like this, they will grind together, wear and break. If the mesh is not deep enough and only the tips of the teeth are touching, the excessive backlash will soon damage and strip the tops off the teeth rendering the gears useless.

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










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