I Have a stihl fs 38 wipper snipper. I am having trouble setting the carb jets. Can you help me?

Yes, all the drive tubes are the same diameter.

a business card will work to get a workable gap but the exact distance is 0.15 - 0.45 mm

If you need further help, I’m available over the phone at https://www.6ya.com/expert/kelly_69a0cf1b13789df1

does it have spark, compression and fuel.? more info please

gear head or drive shaft may have come separated, at cutting end or engine end.

http://www.mediafire.com/download/9gx69951n5znjry

Too long to print here. Go to the zama web sit and they give you a wonderful procedure for adjusting a zama carburetor. Especially important after you have taken it apart and installed a new carb kit. And even if you get a new carb the initial settings are so called defaults and you should really fine tune the carb for your specific motor.

Hi Robert:
Before you remove or try to adjust your low and high speed jets you should always count the number of turns it takes to lightly seat the idle mixture screw and high speed needle adjusting screws.
Be sure to write the number of turns down on a piece of paper so you will know how many turns from the seated position to open the jets when you go to reinstall them, or if you remove them for cleaning or replacement.
If you have aready tried to adjust them then the adjustments below should get it running for you for final adjustment when warm.
Normally you will adjust your idle jet to 1/2-3/4 turn open from the bottom seated position.
Then you will re-adjust the low speed of the engine when the engine is warm by turning the idle screw in or out till the engine runs smoothly at idle speed, around 1200 RPM.
The high speed jet is adjusted to 1 1/2- 1 3/4 open from the bottom seated position, after the engine is warm.
Then re-adjusted by turning the High Speed jet adjustment screw in or out till the motor runs smoothly at high speed.
Alway use the "lightly seated" method if you have not changed the screw settings.
Bud

throttle cable, call a Stihl dealer. Part look-ups for Stihl and others are not available online

all Stihl products are 50:1 fuel mixture

If you need further help, I’m available over the phone at https://www.6ya.com/expert/kelly_69a0cf1b13789df1

needs the spark arrester replaced in the muffler. possibly resetting the carb adjustments to factory settings...