Wossner Piston Kit for the Yamaha TY Mono 1984 - 1992 including Pinky.
This kit comes complete with a Teflon coated Piston, Rings, Gudgeon Pin & Gudgeon pin Circlips as in the photo.
These are available in 68.00mm (Standard 250) +68.50mm, +69.00mm, +69.50mm & +70.00mm
Pistons sizes 70mm or above requires the base of your barrel to be machined.