XR650L High Compression Piston questions.

XR650L High Compression Piston questions.

OK I have a 2001 XR650L. I am using the bike as a Dual-Sport, as I have a good single track bike (xr400). I want to increase power but not at the expense of reliability. I Have made a number of engine mods to the bike, and have been very pleased (see below). So I now I am considering a high compression piston i.e. 10.5:1. I want more hp but want to keep the torque and power curve – low end verses high rpm. I am a good mechanic so the piston replacement (minus machine work) would be done by myself.

Is the mod worth the money and effort?

Even with my cooling mods will heat be a problem?

Will ride-ability be affected?

Which piston, The JE looks like a good choice.

Mods completed so far: Smog Off. Uni filter. Snorkel off. XR’s only competition pipe. Stock header with exhaust wrap. Mikuni 41mm Flatside. XR400 oil cooler. Stock cam. Clark 4.7 tank.


Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now