ditton Posted April 13, 2010 Hi all Hoping someone can help. I was just checking my sons '05 RM125 compression (when cold) and measured anywhere from approx 95psi (first kick) to about 115 (after several). Just wondering if this is ok and what is the spec? Could not find in the manual that we have. Thanks in advance Ditton Share this post Link to post Share on other sites
drmcook Posted April 13, 2010 Did you hold the throttle wide open when you kicked? If so, this is way too low. It should be around 155 PSI cold. Share this post Link to post Share on other sites
aakmetz Posted April 13, 2010 hold the throttle open and kick till the gauge stops rising, 135 to 155 psi is a good range for a 125. below that its repair time. Share this post Link to post Share on other sites
ditton Posted April 13, 2010 Awww crap!! I was holding guage while son was kicking over. 99.9% sure it was while it was closed. Will repeat with throttle wide open and report back with results. Thanks for the great info guys, greatly appreciated. Ditton Share this post Link to post Share on other sites
