after 5 weeks on chruches I finely got to ride my bike. I bought this thing and got my leg smashed before I ever got to ride it. My question is this thing runs lean on the idle so could someone tell me where the air fuel ajuster is. Is it pluged or do they not have oneon the09 klx 250s and pictures wouldhelp lots thanks guys.

 

It will probably involve removing the carb' to get at it.
I'm sure the USA models have a plug.
Here down under we don't. I just fitted a Kubra screw when I had the carb' out. Job done.
Remove all that smog crap and do the fuel screw at the same time.
This might help.https://www.kawasakiforums.com/m_100000/tm.htm

 

hey those are great pics thats was help I needed. So where do I get a kubra screw and are you setting the ajustment off vacuum like on a automotive engines.

 

Get one here.http://koubalink.com/fuelscrew.html
You will need the FS-3 model.
If your a short ***, try a lowering link too.
Setting the screw is too easy.

"While tuning and/or diagnosing any glitches in your powerband that may arise, the following will provide you with a basic
understanding of which circuits are affected during a particular throttle position. In most cases, adjusting the number of E-
Series Discs will improve and/or fix most circuit problems. In case additional adjustments are required, this section will help
you locate and solve the problem. It is important to remember that adjusting carburetion should only be attempted on an
engine in good running condition that is thoroughly up to operating temperature. Do not make adjustments all at once, and
most importantly, do not make adjustments until first trying the exhaust system with the existing jetting. Then trying to adjust
by varying the number of E-Series Discs. Find the affected throttle position (circuit) and work on that area only. Doing one step
at a time will ensure optimum performance and smooth efficient operation.
Pilot Jet- Up to 1/4 throttle - Controls fuel flow through the idle circuit - Mixture is adjusted by means of the mixture screw -
There are two types of mixture screws - Fuel Screws and Air Screws ]
- A Fuel Screw, as the name implies, meters fuel - A Fuel Screw will be located on the engine side of the throttle valve, usually
on the bottom of the carb - Turn in to lean mixture - Turn out to richen mixture - The engine should have a smooth, steady
idle with the screw between 1/4 and 3-1/2 turns out from fully bottomed (gently!) - If the engine requires more than three
turns out, the pilot jet may be too lean - If it requires less than 1/4 turn, it may be too rich.
- An Air Screw meters air - An Air Screw will be located on the air cleaner side of the throttle valve, usually on the right or left
side - Turn in to richen mixture - Turn out to lean mixture - The engine should have a smooth, steady idle with the screw
between 1/2 and 2-1/2 turns out from fully bottomed - If the engine requires more than 2-1/2 turns out, the pilot jet may be
too rich - If it requires less than 1/2 turn, it may be too lean.
Symptoms and/or adjustment - With the idle at approximately 1000 rpm, turn the air screw mixture in slowly until the idle
slows or becomes erratic, then begin turning the screw back out until it again becomes erratic. Count the number of turns in
between the two positions. Set the position of the air screw between these two conditions, which should also be your smoothest
idle . Finally, adjust the idle screw if necessary to approximately 1000 rpm again.
Jet Needle- from 1/8th to 3/4” throttle - Controls fuel flow through needle jet - Raising or lowering the clip location on the
grooves, richens or leans fuel flow, as well as determines at what throttle position the tapered part of the needle is to be raised
out of the needle jet - Raising the needle (lowering the clip) richens the mixture - Lowering the needle (raising the clip) leans
the mixture.
Symptoms and/or adjustment - Accelerate to 1/2 to 3/4 throttle, preferably in top gear. If acceleration seems weak, soft or
flat, or the engine responds slow when the throttle is quickly
opened, the mixture is too lean. Lower the needle clip one position
to raise the needle. Conversely, if acceleration is crisp and strong,
but hesitates or shutters as the throttle is closed from 3/4 to 1/2, the
mixture is too rich. Raise the clip one position to lower the needle.
The optimum setting will be crisp acceleration, with no load up
(rich) as the throttle is backed off.
Main Jet- from 3/4 to full throttle - Controls fuel flow as the jet
needle is lifted far enough out of the needle jet. Until this point
(throttle position), the main jet has no effect on mixture strength. A
larger # jet richens the mixture - A smaller # jet leans the mixture.
Symptoms and/or adjustment - The main jet is the last jet you
deal with and by far the easiest to diagnose. You will only change the
main jet if a problem exists at 3/4 to full throttle. Any other prob-
lems in the carburetion are not affected by the main jet. The two eas-
iest ways to find the optimum setting are:
1) Set-up an area approximately 50 to 100 yards long. Have
someone time you through this area. As you pass the entry, open the
throttle fully (on the main jet circuit) and motor through this area.
Essentially, the jet size that provides the least amount of time to run
through this, is the correct main jet.
2) Starting with a fresh set of spark plugs that have been run for
at least a few miles to gain some color to them, run the engine
(under a load) for approximately a minute or so at 3/4 to full throt-
tle. Then, in a safe area, pull in the clutch, hit the kill switch, and
leave the throttle in its wide open position; all at the same time and
coast to a stop. Then remove the spark plug and inspect its condi-
tion/color. The porcelain should be a reasonably clean color/condi-
tion, light gray to brown is good. If the plug is black and/or sooty,
the main jet is too rich (big) and you should go down in size to a
smaller number. If the plug is white, with no apparent change in
color from brand new, and the engine appears to be running hotter
than normal, it may be lean (small). You need to go up in size to a
larger number.
CARBURETOR CIRCUITS & THROTTLE POSITIONS

This helped me.