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I've heard that as well. I also have read of some tests that were conducted (I don't remember where now though...) that in some cases there were no noticeable differences after andding it, and in...

When you say the carb is "new", I have to ask how it was tuned? The problems Paul was refferring to regarding the carb settings possibly causing this, are spot on, and may very well be the culprit.

Which octane gas are you running in it when it seems to be detonating?