Wössner pistons feature a unique Moly coating on the skirts and a grade of 4032 Alloy (T6) which allows the engine builder to run a closer piston to bore tolerance then he might do on another make of piston.
Yamaha XT500 TT500 SR500 NOS STD Piston Kit
YAMAHA XT500 TT500 SR500 SR400 GENUINE NOS CYLINDER STUD - # 90116-10225
Yamaha xt500 tt500 SR500 Cam Chain Tensioner Cover 5831221200
Yamaha XT500 TT500 1976-1981 Airbox Air Filter Box Air Cleaner Assembly
Yamaha XT500 TT500 1977-1981 Delkevic Full Exhaust 225mm Oval Stainless Silencer