This WSM powerhead rebuild kit is for Yamaha 40 and 50 HP 3-cylinder outboards in the application ranges listed below. It combines the pistons, gasket set, crank bearings, and rod bearings needed for an application-specific powerhead overhaul.
Fitment
- Yamaha 40 HP 3-cylinder: 1989-1994
- Yamaha 50 HP 3-cylinder: 1989-1994
- Yamaha Jet 40 HP 3-cylinder: 1991-1994
- Yamaha Jet 50 HP 3-cylinder: 1991-1994
Technical Specifications
- WSM standard-size kit: 100-252-10
- 3-cylinder powerhead
- 2.638-inch standard bore
Piston Size Options
- Standard
- .010 oversize
- .020 oversize
- .030 oversize
- .040 oversize
Measure the finished cylinder bore before selecting piston size.
Complete Kit Includes
- 3 WSM piston kits with rings, wrist pins, and clips
- Complete gasket kit: 1 head gasket, 1 cylinder-head gasket, 1 base gasket, 2 valve-seat gaskets, 1 exhaust inner gasket, 1 exhaust outer gasket, 1 lower crank O-ring, 1 fuel-filter O-ring, 1 thermostat gasket, 2 lower-housing oil seals, 1 upper crank oil seal, 1 lower crank oil seal, 1 fuel-pump gasket, 1 upper-housing gasket, 3 carburetor-mounting gaskets, 3 air-box seals, and 1 head-plug gasket
- 1 upper main bearing and 1 lower main bearing
- 3 upper connecting-rod bearings
- Lower rod bearings are not included for this application
Fitment Note
Yamaha applications can vary within the same horsepower and year range. Verify the horsepower, year, cylinder configuration, bore size, and any reed or connecting-rod details listed above before ordering.
Questions About This Product?
Have questions about this product? Email us at customerservice@marinepartswarehouse.com and include your motor information with your question.
