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SOURCE: Fix Coil Start Stihl Weed Trimmer
you dont say what model Stihl, lets assume its FS80/85. the torxs style screw driver is part of the tool kit supplied with the machine and includes spark plug spanner 3/4 AF, remove the four screws to release the starter assembly, the starter also retains the fuel tank, dont lose the oblong rubber insert or the tank will wobble around when assembled. if the rope wont return the end of the rewind spring may have broken off or it maybe that the spring has got so rusty its just hanging up. with the recoil off remove the centre screw (normal anti-clockwise) holding the starter away from your eyes, withdraw the pulley and inspect the spring for damage which normaly occurs at the end that engages with the pulley, if it's broken and you cant get a replacement use a pair of pliers to grip the spring about 3/4 inch from broken end, heat with blowtorch to soften and rebend into a hook to engage with the pulley, dont try to bend without softening, clean off any rust with wire wool and re-install the spring in it's housing working from the outside toward the middle.it's more of a knack than anything else and you could probably do with eleven fingers. having installed the spring make sure the rope is fully un-wound and insert the pulley into the housing turning gently until you feel the spring engage, you will know you've got it right when the pulley attempts to rewind, fit the pulley retaining screw, you will observe a notch in the outer rim of the pulley,make sure that the rope is in the notch and use it (the rope) to wind the spring about five times, check that the whole rope rewinds into the pulley, if you still have some hanging out put more turns on the spring but dont over do it. to check, gently pull on the grip until you come to the end of the rope, thats the important bit, you must come to the end of the rope before you come to the end of the spring otherwise the spring will break again.install the starter assembly by offering up and slowly pulling on the grip until you feel the pulley engage with the starter pawl. good luck.
SOURCE: how to replace coil on stihl fs85 weed trimmer
Remove the starter & cylinder cover and look for the coil mounted next to the flywheel. Remove the 2 screws holding it to the cylinder and cafefully pull the wires through the clips that hold them to the block. Install the new coil in the reverse order and set the air gap between the flywheel and the coil with a business card. Let the magnets on the flywheel pull the coil towards it with the business card in between. Tighten the screws and spin the flywheel to remove the card. Reassemble the stater and blower housing.
SOURCE: Ref: Stihl FS46 string trimmer. Broken Flex shaft.
Remove orange sheild,remove single screw holding head in shaft then grab head with pliers and twist side to side until complete head is free.You should then be able to grab part of shaft.On power head loosen screws {about one turn each} that hold two white case halves near trigger,I think there are four,then there is a single torx screw on the bottom of lower case half in the middle that must be taken out to allow tube to be removed.Romove flexshaft from top.Check 4 plastic burnt to flexshaft,if there is you must replace tube liner as well,usally around bent part of tube the liner will go bad.
SOURCE: Craftsman weed wacker trimmer head won't turn
it could still have the broken peice from the old one inside the seat.take it apart and look inside and inspect the seat where the drive cable enters.
SOURCE: Manual for a STIHL FS48
You can get the manual on the link below
http://www.stihlusa.com/information/info_product2.html
http://www.stihlusa.com/stihl_ownersmanuals/FS_45_46_Manual.pdf
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