Here is the big bore kit proposed by ATHENA to increase the displacement of your motocross / enduro KAWASAKI KX 125cc 2 stroke from 2003 to 2007. This kit in Ø58mm against Ø54mm of origin thus makes it possible to pass your motor bike of 125cc to 144cc real! A gain of torque and performance will be immediately felt. It allows a gain of 3 HP on average which is huge on this vehicle. You go from 37.4hp to 41.2hp thanks to the high engine ATHENA BIG BORE. Enough to have fun on the tracks or in the forest. ATHENA has moreover well planned things because this top engine is sold complete. It includes the cylinder, piston, ring, cylinder head and all the gaskets you need for a quality and tight reassembly. The advantage of taking this engine is that it is designed to be mounted on the original connecting rod, so you have no modification to do! Attached is the power curve so that you can see for yourself the difference between the original and the big bore. We have also provided you with the assembly instructions if you wish to have more information on the assembly of this kit for example the adjustment of the squish. You will also find a detailed list of vehicles on which this cylinder can be mounted.

Fits on:

KAWASAKI KX125 2003

KAWASAKI KX125 2004

KAWASAKI KX125 2005

KAWASAKI KX125 2006

KAWASAKI KX125 2007

KAWASAKI KX125 2008

KAWASAKI KX125 2009