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You are running lean with all the backfiring, or your timing is off - nope.
Can you take it back and let them figure it out on there nickle.
~if not~
Check for an air leak with Carb cleaner, spray around after doing a visual check with the engine running. Be careful it's flammable.
If you hit a an air leak the engine will rev a little higher. Manipulation of the the hoses can worsen the problem.
Scott
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