The optimized crankshaft enables the engine to run more stably. Engine Moder253FMMEngine NameCM250Engine Typeparatactic double cylinder, 4-stroke,air ... ATV, TricyclePerformance and characteristic1,.The optimized crankshaft enables the engine to run more stably.2,.The mute rocker arm, ... makes less noise.The engine is equipped with electronic reverse protecting device to improve ...