Jump to content
Sign in to follow this  

airscrew setting

Recommended Posts

I have had some trouble with my 2000 XR100 running roughly at idle and fouling the plug. Slow jet is clean, so is airfilter, valves are correct, all the regular stuff checks out fine. I have found that backing the airscrew out to 3.5 or more turns makes the bike run better. Does turning the screw out richen it or lean it out? I think it richens it but I can't understand why it fouled plugs before and now it doesn't. The idle speed keeps increasing as I turn the screw out, I assume this is more gas getting in, if anyone knows please school me.Thanks for the help!

Share this post


Link to post
Share on other sites

Typically, 2-strokes have air screws, 4-strokes have fuel screws.

Fuel screws are between the float bowl and the cylinder.

Air screws are between the float bowl and the airbox.

Your XR200 has a fuel screw. Turing it out = more fuel.

If you have to go out 3-1/2 turns, it would a need for a larger pilot jet. Ideally, the fuel screw is around 1 to 2 turns out. 3 max. I set the fuel screw way out once. I ran it over when it fell out about 1 block from my house. They are not cheap and the bike ran like crap when it fell out.

Float level can also affect the fuel metering.

How to adjust the fuel screw.

http://www.thumpertalk.com/forum/showthread.php?p=757112#post757112

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Reply with:

Sign in to follow this  

×