O.S. Speed 1BN00 B2103 Type S .21 Buggy Competition Nitro Engine

The long-stroke off-road engine put a high value on torque in low-middle range with smooth operation and better fuel mileage, The crankcase, carburetor and cover plate, and inner head are designed new. All the parts are interchangeable to those of TYPE R’s. High vertical finned ow-profile cooling head for improving the drivability and better heat dissipation, The new DLC coated crankshaft has two tungsten counter weights for smooth rotation and the best balance, A newly designed 3-port cylinder& piston set, The inner head with an silicon O ring for reducing vibration and preventing dust, A newly designed 22D carburetor, which produces high response and smooth acceleration, Replaces Speed Spec III.