Motorcycle accessories: including cylinder body and crankshaft box, usually made of aluminum alloy and cast iron.

    Cylinder head of motorcycle accessories: usually, casting method is used to produce and manufacture.

    Cylinder head gasket of motorcycle accessories: it is usually in the following forms: whole piece hard aluminum gasket, laminated steel sheet gasket, corrugated steel sheet gasket, copper skin asbestos pad, steel sheet asbestos pad and woven steel wire or metal skeleton and asbestos gasket. Generally, copper sheet asbestos gasket or steel sheet asbestos gasket is used for medium and small power internal combustion engines.