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I have a Stihl FS55 trimmer that I am fixing for a friend. It wont start. The first thing I did was check for spark, it had none. I narrowed it down to the ignition module and replaced it. Still not starting. Then I took the carb apart and cleaned everything up with no luck there either. I put the carb on my personal FS55 that works and it worked fine, so that rules out a bad carb. I took the flywheel off to make sure the key was not sheared and it wasnt. So as of right now, I dont know where to look next. It has plenty of compression and the cylinder walls are smooth. What am I overlooking? I just noticed the primer bulb is cracked but I think that is just from me pushing on it a million times the past few days. Could that be the problem? Any help is appreciated.
Have you put a new spark plug in? What type of plug does it have? Is it a resistor type of plug? If so, they have been known to look fine on the outside, but inside the little resistor assembly isn't fine and it can cause crazy backfiring. Went through this with a chainsaw about two hours after Hurricane Ike.
It sucked big time.
'02 F-250 SC SB 7.3L 4x4 w/ 4" SuperLift, 315/75 R16 Toyo Open Country M/Ts, Bilstein 5100s - 6 position DI tuner, AFE Stage II w/Dry S Pro, HPX, 203* Billet, CCV, Sonnax, Tru-Cool, Fumoto, ZooDad, Brite-Box, 4" MagnaFlow SST, ITP OBA, A/C comfort mod!, Autometer Z series gauges, Scan Gauge II, Tough Country bumpers
Yes, I have put in a new spark plug already with no help. It seems to be a timing problem but the key on the flywheel wasnt broken, so I am kind of confused. Every time I pull the plug after trying to start it, it is wet. So it is getting fuel, its just not igniting at the right time I guess.
Only thing I can add to the mix is check the muffler. There is a screen between exhaust port and muffler on a lot of trimmers that clogs up from burning oil and will screw them up big time. I've fixed 5 or 6 that were headed for the trash heap due to that simple thing.
No, I didnt put brake fluid in it, lol. I read that one too. The muffler isnt the problem either. I took the screen out of it earlier , it was clear too, and still nothing. I even tried starting it without a muffler, and still nothing. This one has me completely stumped. It is getting a good blue spark and it is getting gas, so it should at least fire up, right?
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