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Message: [QUOTE="2strokerfun, post: 1388163, member: 69719"] Yep clear detonation sound, no mistaking it. I think it is a combination of factors: 1) the old gas which is probably about 60 octane and contains water by now; and 2) I somehow put a rubber fuel line on it last summer instead of neoprene or vinyl. When I went to drain the fuel out of the tank last night, the interior of the hose is deteriorating into black goo. Of course my carb bowl had crap in it from this. Emptied the tank, put on new fuel line. Will clean the carb tonight or tomorrow night and check the plug. Then I'll get some fresh, non-ethanol, 91 octane and mix up a fresh batch. I'm pretty cognizant of sounds my engine makes, so I'm pretty sure I backed off before any piston damage occurred, but it wouldn't hurt me to pull the head and check it out too. Now where in the heck I got a piece of rubber hose, I'll never know...... [/QUOTE]