Most Wiseco 2-stroke pistons are forged from high-silicone bar stock Greater strength and lower expansion at high temperatures All Wiseco High-Performance pistons are priced with rings, wrist pins and circlips Wiseco ring types are not interchangeable (i.e., CD is not interchangeable with LC) and fit only Wiseco pistons Wiseco pistons can be fitted only with Wiseco rings. - Sea Doo Speedster 650 (1994, 1995); Sea Doo SPX 650 (1995, 1994); Sea Doo Sportster 650 (1995); Sea Doo XP 650 (1993, 1994); Sea Doo GTX 650 (1995, 1994); Sea Doo Explorer 650 (1995, 1996, 1994)