This WSM powerhead rebuild kit is designed for 1995-2008 Yamaha 40 and 50 HP 3-cylinder outboards with a 2.638-inch bore. It groups the major internal rebuild parts into one kit while keeping the application-specific bearing configuration intact.
Fitment
- Yamaha 40 HP 3-cylinder: 1995-2008
- Yamaha 50 HP 3-cylinder: 1995-2008
Technical Specifications
- WSM standard-size kit: 100-252-20
- 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
- Connecting-rod bolts
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.
