PISTON KIT 82-83 YZ490 89.00mm, WISECO 478M08900 YAMAHA MX

Part No. 56-W478+2.00.WI (phoenixmotos.com)
YAMAHA YZ490 1982-1983,
YAMAHA IT490 1983-1984,
Overview of Wiseco Piston Assembly - 478M08900 Wiseco forged pistons are superior in strength and design We carry the full line of Wiseco forged pistons, big bore

Our pistons, rings and kits are sold by application and bore size. Please note that STANDARD and OVERSIZES are not indicated. To get the correct part, you must know the standard bore size to make sure you are ordering either the standard or correct amount of oversize that you need. If you have any questions, please call Technical Service.