These rings will fit all Yamaha 800CC R 66E Power Valve engines. The 800 STD ring is used in all sizes A, B, C, and D bore engines. WSM Rings are top quality RIK Japanese high performance rings and are same ring used by factory Yamaha . Will fit OEM factory pistons.
Pro-X Rings & WSM RIK will fit Pro-X pistons in this application.
Wiseco rings will fit Wiseco forged piston only.
Ring set includes:
1 Top ring
1 Bottom ring
