ATHENA racing 125cc kit for Yamaha YZ 125 motorcycle from 2001 to 2004

Complete kit ATHENA of very high quality high performance!

High quality nicasil treated aluminum cylinder, made in italy.

VERTEX piston, high compression graphite with pre-ground steel segmentation!

Seal ATHENA (one of the best seal manufacturer in the world), we are clearly on the very high end.

Original quality product if not more, the compression as well as the reduction of friction, of the temperature in the chamber will offer more performance to your machine!

This is what makes it a very robust and efficient kit. Delivered complete as in the photo with cylinder, piston, seal, but also relief valves.

Attention, for the installation of this kit, on the models of 1997-1998, you must change the original exhaust with a model of 1999-2003 and for the models 1997-1999 it is necessary to buy 2 torsion springs (valve ) original Yamaha year from 2000-2003.

As an option we offer you a stage 1 preparation, this preparation is a modification of the channels and the exhaust port by increasing the diagrams and improving the duct, it increases the performance of the cylinder. An improvement to the piston and the bottom of the skirt is also included in this modification. Allow a little extra time for this preparation!

Mounts on Off-road (mx) Yamaha YZ 125 - 2001/2004