ProX Piston Kit   13.5:1 (76.96mm)

Yamaha YZ 250 F 2016-2018

Yamaha WR 250 F 2018

Yamaha YZ 250 FX 2017-2019

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.  

Replacement ring set: 02.2417

PROX 01.2417.B