Coming from SMJ is the Kabuto R21 Model ’18 3.5cc nitro on-road engine. The power plant is based off of the O.S. Speed R2103 and it received a new liner, crankshaft and steel main bearing for improved low to mid range torque. The DLC-coated and tuned crankshaft features Tungsten weight balancing and the overall design ensures low fuel consumption even in the high-grip conditions the engine was developed for. The engine is available pre-broken-in to have faster access to its full potential.