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Str8mobbin

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About Str8mobbin

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    TT Newbie

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    California
  1. Str8mobbin

    02 crf450/490 big bore backfiring

    Ok will do thanks guys for all the help I'll update asap
  2. Str8mobbin

    02 crf450/490 big bore backfiring

    Would a bad throttle position sensor on the carb cause the backfire?
  3. Str8mobbin

    02 crf450/490 big bore backfiring

    When reving the bike up with choke off backfires, with choke on idle is pretty high
  4. Str8mobbin

    02 crf450/490 big bore backfiring

    Also timing is dead on valves are in spec.
  5. Str8mobbin

    02 crf450/490 big bore backfiring

    I checked no old o-ring I had this issue on my bike so I made sure that was the first thing I looked for when it wasn't running right and I have it set up exactly like that screw,spring,washer,o-ring cause that's how it was before
  6. I have a buddies bike that I have been working on that has me completely lost any help will be appreciated. It's an 02 crf 450 with Athena big bore 490 kit, the bike ran perfect before a fuel screw fell out while riding now all it does while running is backfire.🔥💨
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