Kit 290cc Ø83mm ATHENA racing Usa Big Bore with reprogramming box for Yamaha WR 250 X / R from 2008 to 2017

Complete kit ATHENA high quality high performance! Aluminum cylinder avaic Nicasil treatment of high quality, made in Italy.

Forged VERTEX piston, high compression 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, of the compression as well as the reduction of the friction, the temperature in the room will offer more performances to your machine! Here, it is not really the maximum power gain that is sought after!

The power comes sooner, faster, and a good increase in torque is present!

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

With this large diameter kit that offers a lot of torque, the cam shaft racing ATHENA is highly recommended, it saves power ahut regime (without risk of loss down thanks to the big kit).

ATHENA crowns all while delivering with the kit an engine reprogramming box, this last parameter your injection to adapt it to the kit!

A power gain of + 8.19ch was measured after the installation of this kit !!

Mounts on :

Off-road Yamaha WR 250 X - 2008/2017
Off-road Yamaha WR 250 R - 2008/2017