The oil tank is made of thick iron. The block has a heat shield to prevent the engine from overheating when the engine is running at high speed. The camshaft is made of pure metal without alloy, so it is not easily broken. The crankshaft is made of high-strength steel, so the engine life is longer. The good air intake and exhaust system prevents the carburetor from clogging easily, and the engine has good torque and traction, so the engine life is longer.