oo yz426f eating spark plugs


12 replies to this topic
  • mygas

Posted December 12, 2009 - 08:34 AM

#1

Every time i wash my yz (not power wash) it pop´s back fire and it won´t start until i put a new sprak plug.
Last time i washed her, i put a new spark plug, then i ride for a few minutes, to dry it up.
Than next morning it start´s OK (like usual when it as a new spark) but after ride like 30 minutes the motor shot down...
I take the spark plug of and it was black (very black) then i put a new one, it run´s fine for another 30 minutes , than the same....
- i clean the carb
-check the oil level- OK
-put a smaller main jet (cause i think it was to ritch)
Put a new plug it start´s ok like allways when the spark plug is clean. and it do me the same after a will of riding...
HELP HELP HELP
-What do you think:
carb problem ???
electrical poblem???
Does it hever hapend to someone?!?!
Thank´s for any help...:banghead:

  • l_campionero

Posted December 12, 2009 - 08:39 AM

#2

Clean the carb, if you haven't done so. You may have a fully or partially clogged passage somewhere. I had that problem with a 250, and am having a bit of an issue with it now on a different 250.
Is the bike stock? What is your jetting now?

  • mygas

Posted December 12, 2009 - 09:11 AM

#3

It´s stock, only have a FMF power core 4 and a twin air filter...
Maybe the electric valve from the carb is jetting to much gas???!!
I dont know waht to think....
But thank´s for trying to help...

  • l_campionero

Posted December 12, 2009 - 09:20 AM

#4

....Maybe the electric valve from the carb is jetting to much gas???!!....


Posted Image

  • 84rm250

Posted December 12, 2009 - 10:06 AM

#5

Maybe he thinks tps controls gas??

  • fishnutz

Posted December 12, 2009 - 11:02 AM

#6

I recently had a similar problem on my 02 426. Turns out it was a plugged air vent line. One of the lines had dried mud in it and was forcing a rich condition on start up. I snipped the plugged end off the vent tube, started with a new plug, and I've been out on the track three weekends without any issues.

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  • grayracer513

Posted December 12, 2009 - 11:30 AM

#7

What brand and number is the spark plug?

  • LEMMON1

Posted December 12, 2009 - 11:58 AM

#8

mine was eatin plugs before but mine ended up being jettting

  • mygas

Posted December 12, 2009 - 12:01 PM

#9

NGK cr8e

Edited by mygas, December 13, 2009 - 09:16 AM.


  • mygas

Posted December 12, 2009 - 12:07 PM

#10

Clean the carb, if you haven't done so. You may have a fully or partially clogged passage somewhere. I had that problem with a 250, and am having a bit of an issue with it now on a different 250.
Is the bike stock? What is your jetting now?


what you mean by"clogged passage"???
Sorry but i´m from Portugal ,and some technical term´s i might dont understan...
Thank´s

  • mygas

Posted December 12, 2009 - 12:09 PM

#11

mine was eatin plugs before but mine ended up being jettting


What do you do with your jetting to ended up wrigth???

  • tmc55

Posted December 13, 2009 - 06:12 AM

#12

the stock spark plug for the 426f is cr8e and i never foul a plug

  • mygas

Posted December 13, 2009 - 09:16 AM

#13

That´s the same i use....
Lucky you...





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