mods on an 03 wr450f searching for the fuel mixture screw
Posted July 09, 2008 - 05:20 PM
I have been searching for a picture of where the fuel mixture screw might be located
I could use some help. I've ridden bikes for many years, but I just got a 03 wr450f. I wanted to do some mods. So far I've just removed the grey wire, and the baffle in the exhaust.
I thought I'd replace the fuel mixutre screw, but which one is it?
Also, is it true that if you turn the choke button you increase or decrease the throttle?
any help would be appreciated.
just an old biker
Posted July 09, 2008 - 07:43 PM
The choke knob is purely a plunger. You may be getting confused with the idle speed adjustment screw knob which is next to the choke.
Posted July 09, 2008 - 09:48 PM
Posted July 10, 2008 - 02:26 AM
Here are the instructions from Merge Racing on how to do it:
And no, rotating the choke know has no effect. The 'choke' (really an enricher) is merely a plunger type of valve, open or closed.
Posted July 11, 2008 - 04:28 AM
There is one problem that has occurred since I removed the grey wire, and removed the exhaust baffel.
The engine refuses to keep running unless the choke is pulled out.
I imagine, that this is because it needs more gas so unless I complete the rest of the mods, the bike isn't going to run like I want it to.
The bike has been jetted for 5000 ft. but I'm running it in Florida. But in the future it will be running up to 9000ft. could this have an effect on performance right now?
If so, what would be my solution?
I appreciate your comments
Just an old biker
Posted July 11, 2008 - 07:38 AM
Typically, elevation changes greater than 2,000' call for jetting changes. Pilot/fuel screw (they work together) needle, clip position and main jet. In some instances, leak jet too.
Posted July 22, 2008 - 04:57 AM
There are a couple of videos on Youtube that showed me how to change out the fuel screw , also do the air box mod. I adjusted the fuel mixture to be a little richer and now I can run the bike without the choke being on:applause: . I hope this doesn't foul the plugs.
Now I'm going back and unplug the gray wire andI'll see what happens then.
Posted July 22, 2008 - 05:04 AM
Posted July 23, 2008 - 04:13 AM
Posted July 23, 2008 - 04:49 AM
Good Luck - WR Dave