Specifications: As high performance parts, alum cog is suitable for mini moto, pocket bike pull starter, pocket bike engine Other performance parts/ tuning parts/ racing parts are also available for scooters, mini-motos, pocket bikes, dirt bikes and ATVs. For example: 1) different types of exhaust pipes/ mufflers 2) different types of clutches for both 2-stroke and 4-stroke engine, air-cooled and water-cooled, clutch springs 3) cylinder, pistons , rings , pull starter, and gearbox, 4) carburetor, air filter, stacks, intake manifold, gasket, jets for both water-cooled and air-cooled 5)brake caliper, brake level, throttle lever, chain, sprocket, foot-pegs, front fork etc.