High-performance, cast pistons closely match original equipment Engineered for the best possible heat transfer from combustion chamber to cylinder walls Rings are replacement for one piston All pistons are priced with ring(s), wrist pins and circlips - Yamaha Excel V 540 (1980, 1979); Yamaha VK 540 II (1997, 1995, 1994, 1998, 1996, 1993); Yamaha SRV 540 (1987, 1986, 1984, 1981, 1989, 1980, 1991, 1985, 1988, 1982, 1990, 1983); Yamaha XL-V 540 (1985, 1989, 1990, 1988, 1986, 1987); Yamaha VK 540 E (1991, 1990); Yamaha VK 540 (1989, 1988); Yamaha VK 540 III (1999, 2002, 2003, 2000, 2001)