Backfiring...


3 replies to this topic
  • bigroj

Posted July 01, 2005 - 03:51 PM

#1

Can someone please tell me why a bike would backfire? I have a 2004 YZ450F with about 5 total hours on it. It just started to backfire and I'm not sure why a bike would do this...any help would be greatly appreciated.

  • freestyle250

Posted July 04, 2005 - 03:22 PM

#2

Can someone please tell me why a bike would backfire? I have a 2004 YZ450F with about 5 total hours on it. It just started to backfire and I'm not sure why a bike would do this...any help would be greatly appreciated.

I believe it is because of the excess air in the pipe that is just igniting. it doesnt necessarily mean that anything is wrong with your bike. i have an 05 WR and i backfires quite a bt because of the smog pump on it. you could try messing around with the jetting if you want and see if that is the reason. just do a search on the site for your altitude and see what some of the other guys recommend :)

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  • N7SLC

Posted July 04, 2005 - 03:25 PM

#3

If it's backfiring on decel with the throttle chopped, then the pilot circuit is
lean.

  • Indy_WR450

Posted July 04, 2005 - 03:46 PM

#4

Clean and re-oil your filter. It is not good to leave the bike sit with an oiled filter for weeks and then go riding. :)




 
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