These rings will fit all Mercury 3 Cyl. 40 HP 97-07 . WSM Rings are top quality RIK Japanese high performance rings. Will fit OEM factory pistons.
Wiseco rings will fit Wiseco forged piston only.
Ring set includes:
1 Top ring
1 Bottom ring
O.E. No. 39-831255A6
This ring set will fit the following applications only,
Mercury 3 Cyl. 40 HP 97-07
