PROX 77mm FORGED PISTON KIT A, YAMAHA YZ250F 14-15, WR250F 15-17, YZ250FX 15-16

2-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 02.3340,

Yamaha YZF250 YZ250F (2014-2015),
Yamaha WR250F (2015),

PROX 01.2414.A