The joy of jetting.....
Posted December 12, 2005 - 07:33 PM
Posted December 12, 2005 - 07:36 PM
Posted December 12, 2005 - 07:57 PM
I also have an 05 WR450; the mods I have done are as follows:
I added the JD kit and the Zip-ty fuel screw (I think at 2 turns). I went with a 168 main, and blue needle at 3rd clip. I just rode up at Bell Mtn. (off the 15 frwy), which I think is at about 2000-3000 feet. The bike runs great. Starts easily, and idles nicely. The power difference is awesome. I have not done anything else, but i am only planning on changing the main jet when I ride up in Big Bear next spring. I do notice barely a bog right off idle.... which is most likely the acelerator pump. I am not sure if or when I will mess with that.
Posted December 12, 2005 - 08:05 PM
Here are my settings. I rode this weekend and it boged 1 time when I was in to high of gear. But I agree you need to ask burned.
Ap adjusted 1 turn ccw
Elev: 4500 to 8000
30 to 55 OAT
1 1/2 fuel screw
JD blue 5th pos.
Posted December 12, 2005 - 09:23 PM
Pilot circuit still affects the whole throttle range.
Posted December 13, 2005 - 06:58 AM
Posted December 13, 2005 - 07:47 AM
Posted December 13, 2005 - 11:05 AM
I have a yzf which of course is gonna have different jetting, but everyones advice on my bike and the way it came jetted when I bought it had it overly rich throughout the range and I had the same symptoms. Even fouled plugs. I do a lot of trailriding and occasional enduro races, so keep that in mind.
And, only change one jet at a time. Dont' go and change out a MJ and a PJ in conjuction or you won't know the true nature of the changes.
Go check out the YZF jetting forum for some of my jetting hassle.
Posted December 13, 2005 - 03:26 PM
Last question, is a hanging idle a sign of a lean pilot circuit or a rich one?
Adjust fuel screw out, more than 2 1/2 turns out, go bigger to 48.
Posted December 13, 2005 - 06:06 PM
I'm at almost identical conditions, same elevation, but a little cooler, staying in the 40's. I'm running a 170 Main, 45 Pilot, 80 PAJ, JD Blue #4, 42 Leak, XXXXX-17-00 AP Diaphragm w/ Quickshot, 72 Starter and around 2 turns on the screw. I'm running great, zero bog or stumble. If I were you, I'd pull the carb, open it up and clean EVERYTHING. If you've been running rich, you likely have some crap in there. Pull all your jets and soak them in carb cleaner. Liberally spray the inside of the carb and then blow it out with some compressed air in the 60-80 PSI range. Blow out the jets and visually verify that they're not clogged. Verify your AP timing per the manual. Also check the rubber joint that connects the carb to the cylinder...mine was cracked and had a substantial air leak. Verify that your slide moves properly and that the slide plate is installed properly with the flat side down. Once that is all done, put it back together and retry. If it's still a no go, then I'd suggest checking your valves as a tight valve can mimic carb issues. While you're at all of this, put in a fresh spark plug too. It's cheap and can't hurt.
Beyond that, I don't know, but I'll bet if you follow the above instructions, you'll fix your problem. Good luck!...SC
Posted December 13, 2005 - 07:44 PM
Posted December 13, 2005 - 09:18 PM
That was the last straw.
I installed an Edelbrock carb and now I don't have to worry!
Posted December 14, 2005 - 07:58 AM
I feel your pain. I went through all the problems with the stock carb. One day I came back from a ride and saw that my Zip-Ty fuel screw had fallen out (which I found out later here that it's happened to other people as well).
That was the last straw.
[COLOR=Red]I installed an Edelbrock carb and now I don't have to worry!
Edelbrock, where and how much?
Posted December 14, 2005 - 08:21 AM
Posted December 14, 2005 - 09:42 AM