2 Ring .015 Os Bore Inline Piston Kit - 18-4621 - Sierra
Replaces OEM part #
- MERCURY MARINE 780-9229A10
- 40-50 HP, 4 cyl, 2.580/.015 bore
- 18-4621 Piston - replaces O.E.# 780-9229A10
18-3967 Piston Ring - replaces O.E.# 39-18653A1
Wrist Pin ( Not Sold Separately)
18-4294 Circlips - replaces O.E.# 40-52035
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