The WISECO Piston Kit is a 40.00 mm piston kit designed for select Yamaha PW50 applications. Forged from a high-silicon aluminum alloy, it is engineered for strength, dependability, durability, and sustained performance in trail and racing applications. The piston design and skirt profile support increased horsepower and torque, while the high-tech construction provides a high compression ratio and an ultra-stiff forging.
This kit features a forged piston, rings, wrist pin, and circlips. The piston crown, ring grooves, and pin bore receive an E-Coating for wear resistance and protection against micro-welding, galling, and detonation. Titanium nitride-coated rings and the GP Series design help support bore sealing and increased compression. Boost ports are removed for a more predictable powerband and increased pull on the top end. Cylinder sleeves must be purchased separately.
Distributor part number: 653M04000. Manufacturer part number: 653M04000. Fitment includes 1982, 1992, 1993, 1994, 1995, 2000, 2010, 2015, 2017, and 2019 Yamaha PW50 models. Racer's Choice pistons are intended for expert racers and tuners only, and service intervals may be increased compared with conventional WISECO pistons.
Features:
- 40.00 mm piston kit for select Yamaha PW50 applications
- Forged from high-silicon aluminum alloy for strength and dependability
- Includes forged piston, rings, wrist pin, and circlips
- E-Coated crown, ring grooves, and pin bore for wear resistance and protection
- Titanium nitride-coated rings support sustained performance
- GP Series design helps seal the bore for increased compression
- Removed boost ports provide a more predictable powerband and increased top-end pull
- Cylinder sleeves must be purchased separately
- Intended for expert racers and tuners
Fitment:
1981 Yamaha PW50
1982 Yamaha PW50
1983 Yamaha PW50
1984 Yamaha PW50
1985 Yamaha PW50
1986 Yamaha PW50
1987 Yamaha PW50
1988 Yamaha PW50
1989 Yamaha PW50
1990 Yamaha PW50
1991 Yamaha PW50
1992 Yamaha PW50
1993 Yamaha PW50
1994 Yamaha PW50
1995 Yamaha PW50
1996 Yamaha PW50
1997 Yamaha PW50
1998 Yamaha PW50
1999 Yamaha PW50
2000 Yamaha PW50
2001 Yamaha PW50
2002 Yamaha PW50
2003 Yamaha PW50
2004 Yamaha PW50
2005 Yamaha PW50
2006 Yamaha PW50
2007 Yamaha PW50
2008 Yamaha PW50
2009 Yamaha PW50
2010 Yamaha PW 50
2011 Yamaha PW 50
2012 Yamaha PW50
2013 Yamaha PW50
2014 Yamaha PW50
2015 Yamaha PW50
2016 Yamaha PW50
2017 Yamaha PW50
2018 Yamaha PW50
2019 Yamaha PW50
2020 Yamaha PW50
2021 Yamaha PW50
2022 Yamaha PW50
2023 Yamaha PW50
2024 Yamaha PW50
2025 Yamaha PW50
2026 Yamaha PW50