Question about 2003 Yamaha YZ 450 F

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2003 yzf450 wont run right?

Dies when given throttle... runs with choke on, dies when choke is off.... backfires... already cleaned plug and carb.... knock in the motor.... Cleaned air filter. Any suggestions?

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  • doc_beer Jan 02, 2009

    hmmmmm try taking it to a shop?

  • Anonymous Mar 12, 2014

    Honda HR21 lawnmower would start and run for about 5 seconds, then die. Pulled tank, carb, air filter and plug. Cleaned everything thoroughly, re-gapped plug and filled with fresh gas. Motor has good compression. Now it starts and runs great on low, medium, and high throttle settings. After warming the motor up for aprox 5 minutes, I try to engage the blade clutch (motor on high, and it kills the motor, every time. If I over rev the motor manually (past the governor setting), the blade will start and seem to operate normally but when I let the motor fall back down to the "normal" full throttle rpm setting, the motor dies. It's as though the motor needs to run faster than full throttle (on the governor) for it to start the blade and keep it going. Thank you in advance for your reply.

  • Anonymous Mar 14, 2014

    I have a 2003 super glide that is hard to start and the choke doesn't work. sometimes it backfires through carb

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Recheck pilot jet & pilot circuit.also check compression

Posted on Feb 16, 2009

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It could be a simple fule filter!

Posted on Jan 02, 2009

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