tpence2177
ArboristSite Operative
So I inherited a fairly low hours Stihl FS90 from my dad that he had accidentally dropped off a trailer going down the road. Dad couldn't get it started after a new carb and coil so he just got a new one drained the gas and set it aside for several years. I was wanting a dedicated brush blade trimmer to go with my FS80 so I didn't have to swap them out all the time. Got it to my house and got it apart and I found out why it wouldn't start. The rocker arm had come off the exhaust valve. Got that fixed. Primed it up and it flooded really bad the first time I tried to start it (acted like the tank wasn't venting because gas would pour out of the mouth of the carb even with just turning the trimmer over a couple of times, as well as I could hear a hiss when I opened the gas tank.) so I pulled the plug over night and loosened the gas cap. Next day I got it to crank but it only stays running if I press the primer bulb. Trimmer runs great as long as I feed it gas with it. Does it sound like the fuel lines are on backwards? That was my next adventure considering so far this thing has cost me nothing. Piston and cylinder looks great from what I can tell. Don't have a way to measure compression right now though so I am unsure of that. I would think it would be ok though. Primer fills up just fine with no staying deflated or anything. Thanks everyone for the help!
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