I can't seem to adjust the idle screw correctly.! please help me


This is a picture that I got off the forum, which side of the opening are we adjusting.. I seem people have opening that's facing the engine and some people have openning facing the HSN. When I turn the idle screw, I can see the opening facing the HSN gets biggers However, after a few throttle, it goes smaller and smaller likes it's going back to the original position. Once I have enough openning, the throttle is too tight...

I can never get it to open 1mm..is it that hard to adjust the idle screw???

How should I start over again in adjusting it.

It looks like you have a rotary carb. You need to adjust "this opening" not the one near the HSN.

If it were a slide carb then you would be adjusting the opening near the HSN but you would not have any opening at "this opening".

i am guessing from the looks that it is a "rotary carb", you will want the gap that you "pointed to" (not the one by the HSN) to be at the proper setting [8D]

could my carburetor be broken???

The "idle stop screw" (located approx the center of your pic) can sometimes be difficult to adjust.

Often this is because the rotating part of the carb is stopping it. If you want to screw in your idle stop screw a bit, try holding the throttle open, and then turn the screw. Once you release the throttle, the opening should now be larger.

Also, some engine manufacturers use a bit of thread-locker on the idle-stop screw. Not loc-tite, just the gummy stuff. Guess they feel the spring isn't enough to keep the screw from vibrating loose. Anyway, this can make adjusting the screw more difficult.

All in all, I doubt your carb is broken.