These rings will fit all Mercury 4 Cyl. 40 HP 90-97, 45 HP 86-89 (Inlne 4). 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. 39-18653A12
This ring set will fit the following applications only,
Mercury 4 Cyl. 40 HP 90-97, 45 HP 86-89 (Inlne 4)
