New answers tagged yamaha
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Backfiring is usually a sign of the engine running rich - unburnt fuel is passing into the exhaust system.
Assuming it's a new carb for that exact model bike, I would assume it needs to be synchronized.
This can be done with vacuum balancing kits like this. (Link to Amazon)
If this doesn't resolve your issue, check your air filter. If it's plugged up and ...
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