though they require the specified modification to the cylinder head itself
98mm big bore cylinder NO CORE REQUIRED
Honda TRX450R (2006-2014)
This Blaster Big Bore Kit Complete Rebuild Top Bottom Kit is the ultimate performance package designed to unleash astonishing power and torque
Porting your head as much as you possibly can is not the way to go
Yamaha YZ250 YZ 250 Transmission Bearings Rebuild Kit SKF Bottom-End Bearing Kit Polaris RZR though they require the specifiedYamaha OEM Parts, 93306 20540 00, 93306 00442 00, 93306 00426 00, 93306 20562 00, 93306 90501 00, 93306 90506 00, TBK0065 Premium SKF Transmission Bearing Kit for 1999 2025 YZ250 Complete 6 Piece Bottom End Upgrade Revitalize your YZ250 with our Premium SKF Transmission Bearing Kit, designed specifically for 1999 2025 models. This complete bottom end bearing kit includes six high quality bearings, featuring four transmission bearings and two shift cam