Check out www.chainsawcc.com for these and many other Wiseco pistons in standard bore and "Big Bore" kits... I have used Wiseco pistons for 25 years in dirt bikes and chainsaws and I have nothing but good things to say about them... make sure you read the information on the website before you order to make sure you are capable of doing the work... I will be testing and reviewing this piston in the very near future... THANKS DAVE!!!