FITS ALL YAMAHA BANSHEE YEARS AND MODELS!! 68mm big bore Athena cylinders. 68mm Wiseco forged stroker pistons. 68mm 22cc billet cool head style domes cut for 4mm stroker crank. Cylinder to case dowel pins.ALL YOU NEED TO MAKE A 421 ATHENA STROKER KIT! Kit comes with ring gap set on pistons! We recommend that this be installed by a qualified mechanic with experience doing this type of work. The item "Banshee Athena 421 Big Bore Kit Cylinders Top End Rebuild Stroker Domes Pistons" is in sale since Friday, August 7, 2020. This item is in the category "eBay Motors\Parts & Accessories\ATV, Side-by-Side & UTV Parts & Accessories\Engines & Components". The seller is "bpracingatv" and is located in Upland, California. This item can be shipped worldwide.