fyrman41
Typical gear head
Hey guys just join maybe an hour ago haha. So ive been searching through threads and various other places but can quite answer my problem. I have a 79 special with k&n oem style filters, pamco ingition with e advancer, and commando mufflers. The bike seems to be detonation under load between 2k and 3k rpms, it sounds like keys jingling. It's only heard when the bike is warmed up, and its less prevalent but sometimes still there on cool nights. I had the timing set very well with a timing light and it doesn't over advance, I even went from a #27.5 stock pilot jet to a #30, along with going from a #135 main jet up to a #142.5 and I havent lowered the needles. The spark plugs very light tan insulator nose and the left plug seems to have some small speckles on it, which I heard is a sign of detonation. Cam chain has been tighted and valve tappeds adjusted. I bought the pamco with e advancer figuring that might fix it, cleaned the carbs, check for air leakes ect. Im at wit's end. Bike runs great otber than that. Could I still be too lean?
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