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When checking for a spark you must make sure the spark plug is well earthed against the cylinder, and give the starter a good pull, if there is no spark try a new clean plug ( make sure the ignition switch is on ) if all this fails then unfortunately you may well need to fit a new ignition coil, this will be situated under the covers against the flywheel.
Adjust the carburetor screws in all the way...do not force them. back the screws out one and a quarter turns and the machine should try to start. adjust the screws one at a time... one quarter of a turn until the machine runs properly. Then adjust the idle.
Most Stihl's are the same...Sounds like you need to adjust your mixture screws on the carby. you will need a small flat blade screwdriver (usually these are supplied with the wipper snipper from new and they have a little arrow on the top), H is for the High speed mixture screw, L is for the Low speed mixture screw. Turn the screws clockwise in until they seat (do NOT tighten!!) then turn them anti-clockwise the recommended amounts of turn on the cover around the holes. Careful not to lean the mixture out too much, but if it is the newer type they have a restictor on the High Speed that stops it at 3/4 of a turn. start it up and hopefully it will fix your problem, if not you will have to take it to a professional. Further info majority of STIHL high and low mixture setting are fine tuned via the respective rev settings , you'll have find out the particular setting from your STIHL dealer(sorry)
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