Throttle Slide doesn't fully open

[975]

I just noticed this while fiddling with my carb, the slide doesn't fully clear the intake. There is almost 5 mm left when it stops.

I thought it was a throttle stop screw getting in the way but no, I've traced it to the needle screw hitting on the top cover. It even leaves a dent in the cover.

Isn't this all wrong?!

[odonnks]

I'd remove the needle screw and inspect it.

Did you or someone else change the needle?

Could the needle screw be cross threaded and not completely installed?

[975]

I checked it out and everything looks fine but I think the screw itself is not the right part. It looks nothing like what I saw in the service manual. Mine is a big 10mm hex head, in the manual it looks more like a receding hex that sits flat with the assembly.

It would make sense as the head of the screw is about the size of what sticks out from the slide.

[975]

damn it, that's the problem ... how could this have been mixed up, I gotta have a talk with my dealer

we can see on this diagram, #25 doesn't have an hex head :

http://www.allensperformance.co.uk/images/exp-fcrmx.gif

[Mike in Fresno]

yeah, it an allen and is recessed when fully tightened

[D1k]

It is called a throttle/performance limiter. My manual(2001 EXC) clearly lists it.

The SX models did NOT come with it, but the EXC and maybe the MXCs came with it.

When you compare both models, there is a 5-10mm height difference. There are some video floating around that show how to remove the screw. Part of the "FREE" mods built into the our wonderful KTMs.

?

[Mike in Fresno]

good info dk

[975]

An intended limiter?! Jeez, it's hard to believe they'd make one this way, it really hits directly on the aluminum cover.

Here's what it looks like :

[975]

The original part for this is pretty expensive, OEM comes with the spring and seat for about 45$. I'll try to tinker it to cut off the head an slice a nudge for a flat head screw driver.

can't believe I've gone so long with this handicap lol

[odonnks]

Its HUGE !

What bike was that on?

[975]

450 Exc 2005

[Mike in Fresno]

thats the right spring loaded deal on the end so the info from dk is good

[975]

hehe found the vid to explain everything

Now I understand, it's actualy the real throttle stop I have but it's already been cut for most of its length. I'll go on and cut the rest of it unless my dealer can give me the right screw.

I gotta say though, the standard stop screw is damn big! with it the throttle probly can't open more than 1/4 ... this is totaly ridiculous unless it's intended for break-in period.

[Mike in Fresno]

smog stuff Im guessin

[WR250F Captain]

does this come on the new bikes?

[975]

Issue resolved :

did an awful job trying to center the flat head mark but it works! woot

[D1k]

Issue resolved :

did an awful job trying to center the flat head mark but it works! woot

That's an awesome job Vanista !!

Have fun with the new top RPM pull climbing those steep sand hills !! ?

[975]

Will do! Thanks ?

And for prosperity, the screw is made of aluminum and is very easy to work with... Save your cash and modify the stop screw instead of buying the sx version.

[Dave Hopkins]

What model & year? None of the US models have that, Euro EXC's do in fact I have seen pics of ones about 3 times as tall, needed to import to some countries. If you bike is a few years old it probubly was a Euro model, as of a couple years ago KTM USA has provided the bikes for Canada so I don't think current Canada product has that.

Be carfull with that spring & cup on the bottom! We do not want it bent!