'05 WR450 Stalling/Backfiring


7 replies to this topic
  • hotthrottle613

Posted March 14, 2011 - 08:53 AM

#1

I have read all the search results I could find and have not yet found my exact problem. Recently, the bike started backfiring and stalling, usually after about 15-20 minutes of riding. It idles fine at the truck or in the garage, but under a load the problem reappears. I've torn the carb down twice, rejetted to stock and checked and re-checked the valves. My computer water temp gauge indicates it is usually running at 180-200 degrees. The backfire is extremely loud, not just a little pop. It will re-fire for a few seconds then stall again. It also will act like it is not getting spark, but has spark when I check. The only thing I did before this started was to loosen the rectifier so that I could install a ground for my computer. Any suggestions???

Thanks,

Mark

  • woods-rider

Posted March 14, 2011 - 09:03 AM

#2

When was the last time you checked your valves? repacked your muffler (backfire issue)?

  • dgcars

Posted March 14, 2011 - 09:07 AM

#3

Go back to where you worked at the wiring. This sounds like an electrical problem.

  • hotthrottle613

Posted March 14, 2011 - 09:36 AM

#4

Go back to where you worked at the wiring. This sounds like an electrical problem.


Yeah, I'm also wondering if it might have to do with the coil where I wrapped the tach wire on.

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  • jrutkows

Posted March 14, 2011 - 02:15 PM

#5

I've run into two separate problems that were hard to troubleshoot, neither caused what you described but maybe worth a quick check.

1) The vent on my gas tank got plugged, if that happens only to minor degree so that a vacuum builds when you are using a lot of gas, then you could go lean. When you're riding and it happens, unscrew the gas cap and see if it goes away. Worth a quick try and should be easy to fix. (my case was actually the opposite and there was pressure building causing poor starting on the trail when ever I stopped for a few minutes)

2) My coil went bad, but only showed symptoms when the bike got hot, so it was intermittent and hard to diagnose. If you have access to a spare coil, it might be worth swapping to see if it goes away.

good luck...

  • hotthrottle613

Posted March 14, 2011 - 08:10 PM

#6

I've run into two separate problems that were hard to troubleshoot, neither caused what you described but maybe worth a quick check.

1) The vent on my gas tank got plugged, if that happens only to minor degree so that a vacuum builds when you are using a lot of gas, then you could go lean. When you're riding and it happens, unscrew the gas cap and see if it goes away. Worth a quick try and should be easy to fix. (my case was actually the opposite and there was pressure building causing poor starting on the trail when ever I stopped for a few minutes)

2) My coil went bad, but only showed symptoms when the bike got hot, so it was intermittent and hard to diagnose. If you have access to a spare coil, it might be worth swapping to see if it goes away.

good luck...


I know the fuel tank is okay; I have a side tank and the bike has run poorly when running off of it also. I will check the coil tomorrow; I believe that is most likely the culprit. Thanks for the input everyone!

  • dragon

Posted March 15, 2011 - 05:17 AM

#7

that happened to me last week, had a tuneup n noted sprkplugs contact already used up, i checked pipe exhaust connections n it wasnt sealed well so i used high temp sealant n bike runs very well now

  • hotthrottle613

Posted April 17, 2011 - 11:34 PM

#8

Sorry it has taken me so long to respond with an answer to this thread. It did indeed turn out to be an electrical issue. I had installed a new trail tech vapor computer and when I followed the directions to install the rpm wire to the coil, I somehow caused the spark to respond in an intermittant way. When I removed the rpm wire, the bike fired right up and is running extremely well. There has been no issue with starting and it runs like it was brand new. I can live without the rpm reading for now; I'll worry about that later. Thanks to those that led me in the direction of an electrical issue!

Edited by hotthrottle613, April 17, 2011 - 11:35 PM.
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