Help I can't get my 450 running right(backfires

4 replies to this topic
  • inspector

Posted July 10, 2008 - 06:44 AM


I bought a new o6 WR450 about 8 months ago. I put a new FMF pipe on , JD jet kit and a fuel mixture screw. The jet kit got rid of my low idle bog butt the bike is getting harder to start and it back fires alot. :thumbsup:

  • William1

Posted July 10, 2008 - 08:16 AM


Did you do the pilot/fuel screw test and setup? Did you ensure you have no exhaust leaks?

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  • kevinwr450f

Posted July 10, 2008 - 09:14 AM


Does the 06 have an AIS? After removing mine all back firing stopped.

  • inspector

Posted July 12, 2008 - 03:38 AM


I don't know what the pilot/fuel screw test is and yes my AIS is still hooked up. Butt will that make it start easyer with it removed?

  • inspector

Posted July 14, 2008 - 03:53 PM


Thanks, disconnected the AIS and NO MORE backfire. Butt I still not sure whats up with my fuel mixture screw.


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