Jump to content
Sign in to follow this  

2000 rm 125 compression

Recommended Posts

Worn cylinder most likely, outside chance head o-rings are blown. Did you hone the cylinder for a better ring seal?

Share this post


Link to post
Share on other sites

I took the cylinder to the place I bought my piston from and he said the cylinder looked good. So did no work to cylinder

Share this post


Link to post
Share on other sites

How much compression? Looks good must mean he can tell the difference in .003 to .005 (by eye) because that is the difference between barely ok and needing re-plated.

Share this post


Link to post
Share on other sites

Compression is reading 70 after new ring and piston. Before it was reading 58

Share this post


Link to post
Share on other sites

It should be around 150 to 170psi after holding throttle wide open and kicking at least 10 times.

Share this post


Link to post
Share on other sites

I had it wide open with fuel off. Ok I'll try it again later this evenning.

Share this post


Link to post
Share on other sites

So being a rookie at the self mechanic situation I bought a pro xpiston kit @53.95mm when the last piston was a wiseco 54.00mm. So I will be installing the wiseco in the am hopefully that does the trick

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

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

Reply with:

Sign in to follow this  

×