170cc/63mm Big Bore Kit with Camshaft and 31/25 Big Valve Head - All KLX140

This kit comes complete with :

– 63mm Cylinder – 63mm Cast Piston – Wrist Pin – Rings – Clips – Gaskets – Stage 3 camshaft with roller rocker arm design! – Cylinder Head with Big Valve 31-25mm CNC ported

New roller rocker for the custom camshaft to increase bottom-end response, the rocker arms are specially designed for the cam in this package. We have also customize the cylinder head to fit with the new rocker arm.

This cylinder head is already ported and has been customized for 63mm piston size

Now FREE performance valve springs, valve seal and cams bearings are included
Keep all your original parts, simply bolt it up!

Re-jetting of the carb is needed after installing this kit. We strongly suggest an aftermarket exhaust with any bore kit.

We also have performance CDI's to increase rpm limiter, bigger carburetors, high compression piston kit, racing exhaust, custom crankshaft, etc.