Backfire
Hello all:
I'm new to the site and already have a question! My son has a Dune 150 that didn't get ridden much last year. When we tried to start it this year, we had fuel issues from bad gas. The needle valve was gummed-up, so I installed a new carb. It fired up, bur backfires through the carb. I can't see any cracks in the intake, and checked valve clearances which were OK. I'm starting to get frustrated. Any ideas? Thanks in advance for your help!
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