Trying to force a stuck slide will often result in a broken throttle slide. It's necessary to use a good solvent to try to break-down any deposits holding the slide immobile, and if you cannot do it with the carburetors mounted, remove the rack and do it on the bench. Slides are >$100 apiece.Remove your air filter and check that your needles are moving freely. I used a screw driver to reach in and move each slide. Of course be gentle. One needle was hanging up and causing a backfire as you describe.
Good advice. My slide wasn't stuck. The needle was hanging up. Readjusted and moved it to another carb. Backfire solved.Trying to force a stuck slide will often result in a broken throttle slide. It's necessary to use a good solvent to try to break-down any deposits holding the slide immobile, and if you cannot do it with the carburetors mounted, remove the rack and do it on the bench. Slides are >$100 apiece.
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