Part No. 56-W223.B.PX
Yamaha YZ450F (2003-2009), Yamaha WR450F (2003-2015),
Gas-Gas EC450F (2013-2015),
PROX 01.2426.B Froged Piston KIT B 95.00 mm Bore. STD. Compression 13.0:1

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 02.2421, PROX PISTON PIN 04.1849, PROX CLIPS 05.1814,