These brilliant big bore kits come with piston / rings / gudgeon pins / clips and all the gaskets to assemble the engine, including a brand new 70cc head. These are 47.00mm offering approx 70cc, they can be rebored as oversized pistons are available. The barrel is water cooled, cast iron and finished in black paint, these are well made and offer excellent value for money. As per usual check your carburation / exhaust and you can increase your performance significantly.