Removing the throttle stop?



5 replies to this topic
  • gawarrior

Posted August 16, 2003 - 04:30 PM

#1

I just bought a new WR426F today. Could someone tell about the "free" power upgrades? I know about removing the airbox lid. How do you remove the throttle stop? And what about the exhaust? What can I do with the stock exhaust to make it better?

  • treecop

Posted August 16, 2003 - 04:48 PM

#2

gawarrior,
You don't want to remove the throttle stop, just grind it down about 18mm. As for the exhaust, pull out the innards "uncorking" it, and then buy a promoto billet endcap and spark arrestor so your are legal and less noisy. I think you can search this site for the other free mods including the gray wire and such.

Good Luck :)

  • Chris_from_Oz

Posted August 16, 2003 - 05:09 PM

#3

Go to MotoMan393's page on the home page of TT, there you will find instructions on the BK/GB mod', YZ timing mod' etc. Most important mod's initially will involve getting it to breathe by removing the airbox lid and opening up the exhaust which you have already mentioned. A YZ muffler bolts straight on, though may be too noisy for where you ride? Re-jetting will probably be necessary after the mod's. HTH :)

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  • wrooster

Posted August 16, 2003 - 06:56 PM

#4

gawarrior,

head over to the WR/YZ250F FAQ, there are a lot of hints and tips there that are also applicable to your WR426F as well.

http://www.thumperfaq.com/

at the least you can use the pictures there to figure out where the throttle stop is.

also see my page here:
http://losdos.dyndns...r-throttlestop/

note that the 250F and 426F probably have different throttle stop lengths -- but you can figure out how long yours needs to be by looking at the slide open through the carb intake.

jim aka the wrooster
'01 wr250f

  • oldbones

Posted August 17, 2003 - 05:17 AM

#5

Or just buy the YZ stop from dealer, it's cheap, and it's the right length.

  • gawarrior

Posted August 17, 2003 - 06:13 AM

#6

Thanks guys, you have been a lot of help!




 
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