Kit 250cc Ø77mm ATHENA racing for Yamaha YZ 250 F - 2014/2015 and Yamaha WR 250 F - 2015/2017

Complete kit ATHENA high quality high performance! Aluminum cylinder with high quality Nicasil treatment, made in Italy. VERTEX piston, high compression graphite with pre-ground steel segmentation!

Joint ATHENA (one of the best seal manufacturer in the world), we are clearly on the very top of the range. The increase of the cubic capacity, the compression as well as the reduction of the friction, the temperature in the room will offer more performances to your machine!

It's all that make it a very robust and powerful kit. Mounts with the original cylinder head without modification of the latter.

Mounts on :

Off-road Yamaha WR 250 F - 2015/2017
Off-road Yamaha YZ 250 F - 2014/2015