Bacfiring question ?



7 replies to this topic
  • Sylvain

Posted April 28, 2003 - 03:19 PM

#1

Last weekend was my first chance of riding my wr 426 for real :D. I mean real real :D. There was an organised tour by the local organisation of dirt rider :D. 280 dirt bikes riding along 240 quads. Nice weather but a lot of mud riding in the frehly melted snow :).

The bike was superb except for one thing . While riding (first gear plowing) in a knee deep mud section for a while :D (20 min or so), I felt the bike backfiring slightly a few times. As soon as I got the chance I stopped to cool me and the bike­ :D.

I assume that the backfiring was due to the overheating of the beast and/or a faulty jetting condition. :D

I'd like to have your suggestions on that. :D

The bike is stock except for the snorkel removed and a Unifilter in place. I normally have 0 problems. It stars normally first or second kick.

Once rested I resume riding and everything went fine.

If you want to see pictures of what is done here, the adress is next :

http://www.fmsq.net/

Thanks

  • Crazythumpin

Posted April 28, 2003 - 04:11 PM

#2

Sounds like your carb vent hoses ended up being submerged for too long. Are you sure it was backfiring and not popping or bogging down?

  • Salty_Dog

Posted April 28, 2003 - 04:47 PM

#3

Only time my bike backfires is when I forget to turn the petcock from "off" to "on" after a break :). The lean condition this generates is the source (I assume) of the subsequent backfiring. I have no idea if this is related to your scenario (doubt it, but hey!), but I figured a bit of information is better than nothing.

  • Sylvain

Posted April 29, 2003 - 03:10 AM

#4

Thanks for the reply. :)

I will re-route the carb vent hoses to the air box. This should take care of any plugging if this was the cause .

But to tell you the truth, I was so busy trying to keep going in that Knee deep sh*t , that you are right to question me about backfiring/bogging down/popping :D.

I was barely cracking the throttle in first and the engine seemed to want to kickback every now and then :D.

That's why I tought I was experiencing backirings. At one point I was concern of breaking or burning valves, but the misfunction didn't last long. And as I said, after a few minutes of cool down, everything seemed to be OK.

Your inputs are appreciated.

Thanks to all TT members

Regards

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  • Bamster

Posted April 29, 2003 - 03:34 AM

#5

Hi Sylvain
Where did you guys do your ride,how far was it from the Ontaio border? I'm always looking for new places to ride.
Does your local club have a web page?

  • Math

Posted April 29, 2003 - 05:58 AM

#6

Hi Bam and Sylvain,

The ride was one of the FMSQ, probably near Montréal (St Michel des Saints ).

Hey Sylvain, I had backfiring problems when the engine was hot ( we talked about that already) and just wanted to mention that following my ride of the last week end, I can confirm that I got rid of the problem with a 175 main jet over the 165. The engine was sure very hot trying to follow my buddy's XR650R in open trails :). I know you mentioned the jeting is supposed to be OK but are you still running the stock 165mj?

  • sabin

Posted April 29, 2003 - 09:09 AM

#7

All good suggestions. You may also check the valve clearance.

  • Sylvain

Posted April 29, 2003 - 03:19 PM

#8

Hi Math !

I can tell you that this was a very great ride :) . Muddy but great.

To answer your question, yes I'm still running the stock jetting. And I'll get a 175 main jet and see how it turns out. Thanks for the tips :D.

One thing I forgot to mention, the elevation at which the ride took place is about 1500 feet. Do you think it could of had an ill effect on the jetting ? Made it leaner or richer ? :D

Should the dealer have this 175 mj in stock?

Did you install the main jet yourself ? I'll study the manual tonight to see the procedure.

Well done guys. :D With this feedback, it's much easier to fine tune our bikes.

Thanks

:D




 
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