my wr eats plugs??? please help

11 replies to this topic
  • danny-goddard

Posted April 10, 2008 - 12:23 PM


hi there i own a wr 426 its a 2000 w reg its had the carb mod air box lid taken off and ive put a yzf pipe on it. it runs mint and pulls really well now the mods have been done:ride: but im only getting about 8 hours out of my plugs:excuseme: ive tried differant plugs but they all last the same amount of time:censored: it really p*sses me off when i crank it up the day before im goin out for a blast (to make sure its ok) then when i go out to it the next day &%$#@! all!!!! it getting close to be sold please help me before i throw a match in the tank:foul: many thanks danny

  • DGXR

Posted April 10, 2008 - 12:29 PM


That's a real bugger... Could you elaborate on what you mean "it eats plugs"? Are they oil- or carbon-fouled? What do they look like after 8 hours? Burned, cracked, broken insulator? Color of deposits? More info please.

  • danny-goddard

Posted April 10, 2008 - 12:40 PM


hi when i say "it eats plugs" i just mean it goes through them quickly. the plugs look a little sutty but nothing major??

  • face_plant

Posted April 10, 2008 - 12:41 PM


trailering bike with fuel on?
eating plugs could be a jetting issue/ pipe
i get 1 yr+ on a plug

  • danny-goddard

Posted April 10, 2008 - 12:45 PM


i never turn the fuel off could this be the answer??

  • 123BigcoopDawg576

Posted April 10, 2008 - 01:02 PM


hi when i say "it eats plugs" i just mean it goes through them quickly. the plugs look a little sutty but nothing major??

does the bike all of a sudden not run? just cuz the plug looks used doesnt mean anything is wrong with others have said a 4 stroke plug will go a long long time before you need to replace it

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  • hillclimbguy

Posted April 10, 2008 - 08:41 PM


This might be nothing, but check the air box for leaks past the filter. Torn boot maybe. Leak in the airbox seal.
I've gone a whole year on one plug. I just changed it because I thought it was time. As much as they cost it'll be another year before I put another one in.

  • Strattos

Posted April 10, 2008 - 09:52 PM


Could be your electrics. If you're not getting the proper spark you won't get the motor running as cleanly/completely as it should and gum up plugs. I had similar problem, although my plugs would last a bit longer than yours. I traced mine to a dodgy resister in the sparkplug cap. In the manual it tells you the reading you should be getting of the primary and secondary coil.

  • wr_matt

Posted April 10, 2008 - 11:01 PM


Dumb question... Are you replacing it with the original OEM plug? Are you sure?

Some pics would really help.

  • Mark_NZ

Posted April 11, 2008 - 02:15 AM


the plug in my 06 WR is the original - got about 95hrs on it - when should I change it?

  • timoyz1

Posted April 11, 2008 - 05:05 AM


I change my plug when I adjust my valves, just because it's there. Without seeing the plug to see if its fouled I can't say, but your word "sutty" sounds like either too rich or you're passing oil. Rich is easier to fix.

  • wrtrailhog

Posted April 13, 2008 - 04:20 AM


A buddy of mine had this same problem, he chased it for months and found out it was a leaky float needle valve. He replaced it and is on the same plug since then. Good luck.


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