I have just uncorked my XR650R and I thought that this would cure my fast idling - it didnt. Reading the manual it states that low compression could be a reason for this, as my bike was already stripped down, I thought I would do a compression test. I connected up the hose (hand tight) to the cylinder (engine cold) and kicked it over a few times. First with the decompressor level held in I basically got a compression reading of 0. Second, I kicked it as if I was going to start it which gave me a reading of about 86psi. When reading the manual it states that with decompressor level held in it should be reading 87psi, and 'normal' operation it should be 160psi. My question is are my tests valid? Should I warm the engine up and wont the automatic decompressor affect the readings? It seems a bit suspicious that I have 86psi on a kick which is very close to what is recommended with the decompressor held in?? Maybe I should tackle the high idling by adjusting the pilot screw and idle setting before worrying about the compression? Any help appreciated. ice.