WR 400..... backfiring, stalling

5 replies to this topic
  • bake

Posted July 12, 2004 - 06:49 PM


Tonight on the way down the mountain my bike started acting up, it's backfiring and stalling.

At the bottom I tried to open it up on flatter ground and it started accelerating nice then nothing, motor stalled wouldn't refire. Any ideas?


  • Guest_Guest_*

Posted July 12, 2004 - 07:14 PM


Dirt in the float bowl? Tight valves? Mine did that one time with a resticted main air jet (too much filter oil). :thumbsup: Good luck

  • V968231

Posted July 14, 2004 - 12:29 AM



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  • KevB

Posted July 20, 2004 - 04:22 AM



I had the same problem on my 98 WR400 during a weekend of wet-weather riding... turned out to be lots of water and cr*p in the carb, especially in the Acc. pump bowl. Take some compressed air to your jets and it should be fine...


  • The_Missile

Posted July 26, 2004 - 01:15 AM


cr&p in the carb ???
check your fuel filter
check your breather hoses & reroute one of each assembly to the air box to avoid sucking crap into it from water etc.

  • TallBoysWRF

Posted July 26, 2004 - 06:14 AM


Try changing your spark plug :thumbsup: My 99 acts similarly to what you are describing when the plug gets fouled. I change my plug and all is well. Just my .02


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