FITS ALL YAMAHA 700cc MODELS AND YEARS (NOT 15-18 GRIZZLY). 105.5mm big bore cylinder. CP JE or Wiseco forged piston. COVID IS STILL CAUSING BACK ORDERS DAILY. WE STOCK THE EXACT SAME PARTS FROM DIFFERENT MANUFACTURERS SO THAT WHEN, NOT IF, BACK ORDERS HAPPEN WE HAVE AN ALTERNATE PART THAT IS THE SAME QUALITY TO SEND YOU.IF YOU ONLY WANT A CERTAIN BRAND PISTON OR CRANK JUST ASK! No modification is required to use this kit. Piston uses pump or race gas. We ALWAYS STRONGLY recommend that this be installed by a qualified mechanic with experience doing this type of work. This item is in the category "eBay Motors\Parts & Accessories\ATV, Side-by-Side & UTV Parts & Accessories\Engines & Components". The seller is "bpratv" and is located in this country: US. This item can be shipped worldwide.