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54 Posts
I would do a throttle chope test with a new plug that will tell you how you are running. I could have swore that I read on here that if you backfire through the exhuast that you r running to lean. That is what that sounds like to me. My motorcycle used to do that from time to time until I found that I was runnin lean and made the mixture a little more rich. My 2 cents.
