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05 crf450r backfires

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my 05 crf450r starts with 2 to 3 kicks but when letting off of the gas it will back fire and starts popping it sat for awhile so it had bad gas in it i drained the fuel tank and put new gas in it and it still does it? should i try cleaning out the carb or do you think the i need to redo the valves? any info will be great thanks

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i had the same problem with my 05 earlyer this year i went threw the carb and it stopped doing it but i also re shimmed my valves that day but i they were not far off so im sure its all in the carb.

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Make sure if you had the carb apart that you put the floating valve set (the carb slide) plate back in with the hole on the bottom. It is so easy to put it in upside down. Will start fine but run like crap and backfire

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