This piston kit will fit all Tiger Shark 639/640 engines. Piston is a full cast and comes with Rik Japanese high performance rings. Wiseco pistons are forged and use Wiseco high performance rings. Order Std size pistons if you are only honing your cylinders. If you have more damage to the bore and the cylinder will not clean up at STD. Please order the correct over size piston kit. Be sure to inspect your sleeves carefully for chipping and cracks. If you have damages beyond boring click Cylinder Resleeving Services for more information and pricing. We also offer top end rebuild kits with cylinder already machined ready to install on a core exchange basis. Click here for more information and pricing.Complete top end rebuild kit includes:1 Piston1 Set Rings1 Pin2 Clips
