Throttle stop-What was I thinking?
Posted March 02, 2004 - 05:26 PM
Posted March 02, 2004 - 05:33 PM
Posted March 02, 2004 - 05:42 PM
The throttle stop on the WRF prevents the slide in the carburetor from opening all the way (limits the throttle to 3/4 throttle). While it exists on both the YZF and the WRF, the size of the stop is smaller on the YZF. Most riders cut down the stock throttle stop to YZF specs (see below). Others have replaced the original throttle stop with the YZF throttle stop (Yamaha part number 5NL-14591-00-00). Many dealers will do this mod as part of the normal setup of this bike. If you buy a new WR250F ask your dealer if they have done this mod.
1. Remove the throttle cable cover, which is located on the right hand side of the bike, by removing a single hex head bolt. To access this bolt you have to pull back a small rubber flap (tab) on the throttle cable cap (Figure 1). (See Owner’s Manual page 4-19).
2. The throttle stop screw is located at the rear of the throttle "disk" assembly, and points almost vertically, tilted slightly towards 1 o'clock as you view from the right side of the bike (Figure 2).
3. Using a 4mm hex head wrench, preferably one with a ball head, back out the throttle stop screw. There is Loctite on the threads so the initial going will be tough.
4. The throttle stop screw measures ~1.30" (33mm) while the STEM only measures ~1.10" (28mm).
5. The throttle stop should be cut to a total length of 0.975" (24.765mm) or a stem length of 0.790" (20mm) in order to match the YZF's full travel. Use a hacksaw or Dremel cut-off saw to make the cut. Cut on the long side and then file to the final length, clean off any burrs and provide a slight chamfer around the circumference (Figure 3).
6. Coat the now-bright cut end of the throttle stop with some light grease to guard against corrosion. Put everything together, again using some Loctite on the throttle stop threads.
Posted March 02, 2004 - 07:36 PM
Maybe it's not even worth it and I am expecting too much.
It is definitely worth it. I would estimate that the gains are slightly greater than 25%.
Posted March 02, 2004 - 08:35 PM
or buy the YZ screw from the shop. I did and it made a BIG difference. Cut (or remove) the grey wire too.
Posted March 04, 2004 - 05:47 AM
Posted March 04, 2004 - 09:11 AM
Posted March 04, 2004 - 09:58 AM
Posted March 04, 2004 - 10:20 AM
I think it's funny how I make a simple post about my conclusion of the throttle stop and I get various types of replies.
Your words..."Maybe it's not even worth it and I am expecting too much"
Exactly what conclusion did you come to?
Posted March 04, 2004 - 10:54 AM
If you seperate the questions from the chaff that might help also.
Posted March 04, 2004 - 04:29 PM
I think it's funny how I make a simple post about my conclusion of the throttle stop and I get various types of replies. I was not asking how to do it, I was not asking if I should do it, I was simply saying I need to do it and I now know what the fuss is all about. For those who replied and didnt give directions or tell me 'enough said' thanks for your replies. There are plenty of posts on how to do it and I wasnt trying to beat the issue into the ground.
Well if all you wanted to do was have an inner monologue with yourself then why did you post to a forum?
Your first post sounded like you were debating on wether you should cut the screw... I responded that you should becasue it makes a pretty big difference...
Posted March 04, 2004 - 05:09 PM