How do i set the timing as i reassemble my stihl fs 90 brushcutter answered by a verified technician once you are there you should be all set and timing in place you may want to turn the engine over a few times and double check your valve clearances i like to check mine with one valve open and then do the same to the opposite. Changing fuel filter air filter primer bulb spark plug gearbox grease and checking valve clearance valve clearance check uses same part for all 4 mix trimmers errata i love how this video . This video should apply to all stihl 4 mix engines the one shown is an fs90r. Just bought this trimmer today wont run worth a crapengine wont stay running along with the clutch rattling too could not get five minutes use out of it very disapointed sthil you should have never discontinued the fs 90 r which i owned for years flawless period taking it back to my good dealer and getting a refund i hope. Are made from time to time therefore some changes modifications and improvements may not be covered in this manual if the operating characteristics or the appearance of your machine differs from those described in this manual please contact fs 90 fs 90 r instruction manual a
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