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Check the fuel filler cap, there is a breather in the top if this is blocked it will create a vacume in the tank, try leaving the cap loose and see if the problem has gone, if not then this is an ignition unit issue, replace the ignition unit.
Are you sure its the coil.? Have you tried relesing the fuel cap and trying it again.? Could possibly the fuel tank vent, creating vaccum in the tank and starving the engine.
Even touching carb jets is the very last resort, if u absolutely have too, turn them closed, b mindful do NOT over turn. Turn jet 1/4 turn and if needed 2nd 1/4 turn. no more than 1/2 turn.
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)
I have a Stihl FS 45 and have had problems with it running for a short time then cutting out. The problem is like to be either- the filter attached to end end of the fuel pick hose that goes down into the fuel tank is blocked or- there is a crackor split in the corrugated section of the fuel pick up hose between the fuel tank and the carburettor. If such a crack or split exists it will cause air to be sucked in with the fuel upsetting the fuel/air ratio. A new hose not adjustment is the only cure
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