XR650L High Compression Piston questions.

No replies to this topic

Posted February 18, 2006 - 08:57 AM


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.


Related Content


Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.