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Re: Backfiring.
I noticed mine doing it worse during fall a couple years ago.. Had already installed the HEI but I didn't change plugs. Seems like I read where on bikes it happens more on a leaner mixture. Had an old car buddy say that the timing was off. Needed more advance. Actually just adjusted it by ear and the popping went away. I drive the truck everyday and it would do it down every hill. Never does it at all now. Could just be coincidence, but anyhow, that's my story lol. I sorta liked it. Reminded me of old race cars. But I'm in a 250ci truck lol.
Chris
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