This Mercury Powerhead rebuild Kit will fit all 50-60 Hp 1984-1990, 70 Hp 1977-1983 3 Cylinder 2.875" STD Bore. Kit comes complete with all parts needed to rebuilt your Engine.
Please Note: STD bore is a direct fit and does not need boring, a light hone is fine for seating the new rings. However, if there is damage or excessive wear to the cylinder, the cylinder will need to be bored oversize and will need to purchase the correct oversize that will remove scoring in the sleeve. Refer to service manual for more information.

Piston OEM# 774-8600A 3, 774 9137A 9

This Kit Supersedes All 3 Ring Pistons.
Kit includes:

3 Pistons 100-15K OEM# 774-8600A 3, 774-9137A 9 STD (Oversize OEM #'s N/A)
3 200-15 Rings OEM# 39-817096A 6 (Oversize OEM #'s N/A) Japanese RIK Performance TOP industry quality Pistons & Ring sets.
3 Pins (300-15)
6 Clips (400-19) OEM# 53-857196
1 Complete Gasket Kit (500-202) OEM# 27-88449A32, 27-43779A87
1 Upper Main Bearing (010-206-01) OEM# 30-64224
2 Center Main Bearing (010-132-56) OEM# 29-71422
1 Lower Main Bearing (010-206-01) OEM# 30-64224
3 Top End Needle Bearings (010-136-29) OEM# 29-47270
3 Lower Rod bearings (010-138) OEM# 31-62596A 1
6 Rod bolts (805-200) OEM# 10-91012

Please be advised, Mercury Re-Build Kits DO NOT go by the year produced. So please check all information available such as the OEM #'s and piston bore size to identify your engine to the correct kit. If you are uncertain about which kit you need, please write us for assistance. Be sure include Make Model & Year if you have it. The best way to be sure of the correct kit is to have the serial number of the engine. This number is located on the lower unit (see photo for example).


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High Performace Quality OEM Style Re-built Kits.Water Sport Manufacturing