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Problem back fire

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Hi everyone,

I need advice. My girlfriend has a problem with her 2000 xt350 aprox. 10,000 km. Her bike always have backfires, she's put a bran new carb, she changed the spark plug and the battery twice. It's her third battery and she's loosing it again. It still backfires all the time when she accelerate. Sometimes it backfires and stalls at stop lights. On the choke it doesn't do it as much. We played with the screw under the brasscap it still backfires. We don't know what to do anymore. Any advice? Thank you all!

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Backfires on acceleration? I'd say check the valves / jetting but it's killing

3 batteries? Hmm...sounds like maybe you've got an electrical issue that

maybe messing with spark or timing.

Sounds like its time to enlist the services of your local dealer.

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Thank you guys,

Valves have been checked they are ok, Carb has factory jetting, what size do you recommend?. We checked the intake air leak with kwikstart and sounds ok. What electrical problem can it be?

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