3-RING A Piston KIT 77.00 mm Bore STD Compresion 13.5:1
Ready to install, ProX Piston Kits are supplied complete with piston rings, wrist pin, and circlips.

- ProX pistons are precision machined on the latest, state of the art CNC equipment and use the same low-expansion, low-friction piston alloy all major Japanese engine manufacturers use. - Uses an OEM style tin coating to assist the break-in process when you first start your machine.
Replacements parts. PROX RING SET 02.2402,

PROX PIN 04.1644.4, PROX CLIPS 05.1612C

Yamaha YZF250 YZ250F (2008-2009),

PROX 01.2409.B