I have been a subscriber for seven years and you guys have never done me wrong, so I turn to you in my time of need. I am adjusting the valves on a 1987 Honda CBR600F. I wanted to adjust the valves because cylinder #2 is short on compression to the tune of 50 psi. After following the directions in the genuine Honda service manual, I found the compression had dropped in every cylinder by about 5 psi, with the exception of that cylinder, which dropped about 40 psi. After some experimentation I found that with its valves adjusted slightly tight, the compression came back, but only to the original reading and not factory spec. Does this clue you into what might be happening without pulling the head? Burned valve? Worn camshaft? Know anyone with a used CBR600F motor?
St Louis, MO