throttle stop length for 99 YZF

Hey Guys,

I am a regular on the WR websight. I have un-did all the bogus mods Yamaha did to change the YZ to a WR. I shortened my throttle stop to allow for full throttle opening. The directions seemed a little wrong or vague. What I did was with the stop removed, opened the throttle fully. Then I cut down the throttle stop to allow the same achievable position of the throttle. Now I am wondering whether or not I shaved off too much. There has been some mention if too much is removed, it screws up the TPS or some other electrical input to/from the carb. Have any of you guys ever removed the throttle stop on your 99 YZF? Any idea what-so-ever the OVERALL length of the throttle stop? My only option at this point is to order a YZ throttle stop from my local Yamaha dealer. If I knew the actual length, I could zip off to the hardware store and rummage through their bolt collection and make my own with the right pitch bolt and two jam nuts.

My bike stumbles so severely at the top end, I am wondering if it the ignition somehow. My revs seem too low to be the rev limiter. My jetting should be close to ballpark, according to Clark, our carb guru. So I am approaching this problem one step at a time.

Thanks! Kevin

[This message has been edited by Kevin in New Hampshire (edited 05-22-2000).]


I've never had mine off. The guys over here are pretty helpful, but I doubt that anyone knows....sorry.


Chris in the Mojave

'98 YZ400F


If you ever get a wild hair, it spins off w/ a 6mm or 7mm wrench.

I will be heading to the dealer. I might as well do it right.


99 WR, all YZ mods, de-octopused, OEM YZ tank and seat.

Went to the bike shop today. The only way to buy the throttle stop from Yamaha is to buy a new carb.

Now I will have to try the carb warehouse in Ohio, unless one of you guys feels like spinning yours off to lend me a hand...???


99 WR, all YZ mods, de-octopused, OEM YZ tank and seat.

Hey Kevin.

I've got a throttle stop for my 99 WR right here the uncut length is 24.10mm. Looking at the Throttle stop directions in this forum it looks as though you should remove 8mm. I've heard you should remove anywhere from 8mm to 9mm to get it to the right length. I think what I'll do is start with 8mm and work to 9mm if I need too.

Good Luck!


Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now