I have a problem that no amount of swearing or drinking seems to help

Posted by Aaron on May 23, 2013; 3:28am
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/I-have-a-problem-that-no-amount-of-swearing-or-drinking-seems-to-help-tp4041126.html

I have lurked on this site for a while getting tips and advice, THANK YOU to the guys that run it!! My problem is with a 1980 cb750f that has about 10,000 miles and was sitting for many years. It pops while at steady acceleration. It starts doing it about 3000 to 3500 rpms. I have checked valve clearance, cam chain tension, ignition system (replaced caps, wires, coils, plugs)  cleaned out the carbs meticulously, comp. check was about 140 across the board, and checked for leakage in intake manifolds with no change in popping. The popping occurs in either #1 or #2 cylinder, always. My gut is saying that I have a sticky valve but I just don't know anymore!