Airscrew

[bigkahun74]

Originally Posted by lt250rmx

if your getting hesitation on the low end, I'd go leaner. but just be sure to check your plug.

thats the first thing i was going to do. what wanted some opions

[pinger.j.]

yea i no how to read a plug

[Banshee]

Wow way to much confusion.

Ok the Idle screw adjusts the slid position when the throttle is at resting postition. This allows just enough air to be pulled into the motor to idle if you go all the way in with the idle screw you would have a really high idle which if your drag racing might be what you want. All the way out and your slid will be shutting of the motor from air. well probably a little air would get through.

The Air screw does what I said before in my first post.

There is no pilot screw, well I guess it is kind of a screw. The pilot is what effects your 0 1/4 like the article explains. If your hesitating before right before your power band kicks in you really have to see where your throttle would be at to know different bikes will kick in at different spots. but your most likely going to be effected in the 1/2 to 3/4 range and probably have to adjust your needle and your main jet to get it just right.

[SouperSport]

Banshee... Isn't this from YOUR article that lt250MX posted for us?!?
You specifically said "pilot air screw"....

The pilot circuit has two adjustable parts. The pilot air screw and pilot jet. The air screw can be located either near the back side of the carburetor or near the front of the carburetor. If the screw is located near the back, it regulates how much air enters the circuit. If the screw is turned in, it reduces the amount of air and richens the mixture. If it is turned out, it opens the passage more and allows more air into the circuit which results in a lean mixture. If the screw is located near the front, it regulated fuel. The mixture will be leaner if it is screwed in and richer if screwed out. If the air screw has to be turned more than 2 turns out for best idling, the next smaller size pilot jet will be needed.

[pinger.j.]

k im confused again

[fiveOnick]

Oh come on now you seriously didnt ask me if I had the idle screw mixed up with the air screw. I build engines on the side and usually end up jetting them for most of my customers, I know which is which. Bottom line if you have hesitation on the bottom end then F with it until it stops. As a rule I like my air screw so that when a hard pass is made down the strip the quad just slightly wants to idle up when brought back down to an idle, at that piont back the screw IN a 1/4 turn or so and that usually works quite well. This is why I say out gives it more air thus leaning it. Turning it too far out will make it want to idle up as though it has an air leak which is a lean condition.

[SouperSport]

You were talking about slide height and all, so I just got confused... I read a few other online articles and I think I got it all figured out! I was just looking for info... my jetting is fine for now. THX

[Banshee]

Your idle should be a nice rapid ping. You want it so when you crack the throttle it doesn't have any slow rev up like it will from a really low idle. Also when you have it idling if you crack the throttle and let it come down if your idel dips down your pilot is to small if hangs when coming down your pilot is to high. You should have your idle come right back down to resting on the idle you set before cracking the throttle.

Oh and that is not my article, I guess you can call it the pilot screw but I usually just call it the pilot. to each his own.

FiveOnick I'm not questioning what you said I understand what you were saying I think it was just a little confusing to others so I wanted to make it clear to the people that don't know there carb all that well.

The best way to learn about carbs is to tear it apart take the bowl off check it all out. You will really get a great understanding of what and how the carb works. Then start playing with moving jets up and down to see what it does. It's not an easy thing for all to understand it took me awhile to figure it all our but know I can pretty much jet any bike. Which I think is a curse since everyone brings there bikes to me since they can't do it.

Oh well good luck

[mx uk]

ok, thought i better put this one to bed!!!
THe air screw only effects the mixture to approx one eight of the throttle opening then the pilot jet takes over.
If the bike will tick over & you can snap the throttle open to full without the engine stallin or hesitating then the screw is ok where it is.
if you need to know how to set it up shout back ok.