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[xx(]I am having a slight backfire on a twin, it is on the mag side. Could this possible be a carb issue, such as a sticking float? Carb have been synced.
 

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yeah it could be the float. Or just plugs. Also check you mixture...
 

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I have heard backfires can also some from running your sled fairly hard and then just shutting it down right away. Recommend you to left it idle down before hitting the kill switch.
 
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