How do you....

[400exrules]

How do u adjust the idle speed on a 400ex? I think my idle is set kinda low cuz it sorta sputters and coughs like its gonna die when its idleing and sometimes it will die, but usually when i just start it up. I think it just needs to go up a tad, it acts like its not gettin enough gas at an idle or somethin

[I-7]

Its kind of hard to explain but its on the carburetor. You should start the quad up and you turn the knob with pliers or a flathead screwdriver till you reach the idle you want. I'm sure someone else can give you a better description of what you have to turn I just cant explain it.

[400ex28]

Its on the carb its a big screw by the choke you turn it with a flathead screwdriver.

[400exrules]

what all do i have to take off to get to it? what color is the screw? is the one screw all i will have to adjust?

[400ex28]

You dont have to take off anything, all u need is a screwdriver...its really noticeable it hangs down from the carb and the screw is really big.

[400exrules]

Originally posted by 400ex28
You dont have to take off anything, all u need is a screwdriver...its really noticeable it hangs down from the carb and the screw is really big.

i read in another thread, about turning it until it stops getting to a higher rpm, then lower it back down a 1/4, idk....what should i stay away from, can u mess up by turnin it to high or anything?

sort of gold in color

[JLanphear]

I don't have my quad in front of me so maybe I'm slightly off.

Look at where your choke is....look to the right of that.....You will see a large knob/screw about as big around as a dime (Maybe a little smaller). You can normally turn this with your fingers.

this might help

[400exrules]

ok yah, i didnt know which one it was, thx

[sampleez]

i've noticed on my old 400 that it helps if you adjust it a little, then rev it up some. cause if you don't, it won't do nothing for a turn or so, then it'll rev way up, cause you went too far

[400exrules]

Originally posted by sampleez
i've noticed on my old 400 that it helps if you adjust it a little, then rev it up some. cause if you don't, it won't do nothing for a turn or so, then it'll rev way up, cause you went too far

can it mess anything up if u set it too high or too low, or is it just a personal preference

[sampleez]

Originally posted by 400exrules
can it mess anything up if u set it too high or too low, or is it just a personal preference

naw.....just preference