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OT I NEED SOME STHILL IDEAS,

E

ericlb

Well-known Member
ive been working on a stilh fs 290 weedeater/ brush cutter, it ran fine, then all the sudden it wont wind up, it will sort of idle, now what ive done, changed fuel lines [all of them] replaced filter in the tank, cleaned the exhaust screen it was dirty, disassembled and cleaned the carb, didnt find anything in it even the screen in there was clean, ive always used fresh clean fuel in the proper mix ratio, problem is the same, it will start but will not wind up, choke is working properly nothing plugged that i can find, any ideas of what to do next [ the mix screws have not been tampered with and are set where they have always been after all it did run just fine,
 
should have added the trigger is working the throttle arm it isnt broken there, and i cant find anywhere its sucking in air around the carb gaskets, both diaphrams were checked with a light, i didnt see any cracks in either of those
 
Sounds to me like your fuel mix is not right. Stihls are real picky about the mix. If it is off a little it will not run. I have a Stihl weed eater that I have to mix just for it cause it that picky.
 
I have been replacing carbs rather than rebuilding them on stihl's. There are some internal check valves that just won't come clean. New carbs are almost as cheap as carb kit .
 
There may be dirt trapped against the mixture needles that is restricting the fuel.

Try opening the fuel mixture screws out a good number of turns (5 or 10 turns, count the turns as you go), crank it over a few times to flush some fuel through it, and then return the mixture screws to their original positions (count the turns as you go). That worked on my Stihl FS96(#?) string trimmer.

If you still have the original plastic restrictors that limit how far the mixture screws can be adjusted, remove them and adjust it to run best. Good luck.
 
Double check your fuel mix. My chain saw and weedeater each have a different mix. I got the bright idea to mix it down the middle and use it in both. The chain saw ran good but the weed eater would'nt wind up, of course I had to put a carb kit in it, spark plug, fuel line and take the carb apart again before I thought about the fuel mix.
 
yes im careful about that i have 50;1 on 2 chainsaws and 2 weedeaters,and a blower, 40:1 on another weedeater, and 32;1 on a old homelite xl chainsaw,and a same series water pump, several gas cans clearly marked
 
i got it! thanks ss55, i removed the limiter caps and played with the mixture screws, somehow the highspeed screw was 3= turns out from where it should have been, dont know how that is possible with the caps in place, but it runs like new now! thanks guys again
 
i have the same weedeater and same problem had to have the carb worked on in the dealer shop cant remember what exactly it was but they gad to replace something inside it.runs fine now.RICK
 
My Stihl dealer told me the new machines are set extremely lean and are individually tested to meet emissions standards before they leave the factory. Once in use they run even leaner over time and can damage the engine if they can run at all. It generates extra repair work for his shop, but gives his products a bad name.

Legally he cannot remove the restrictor caps. He doesn't say anything if a customer removes them.

Just like in cars, fuel injection systems and four cycle engines will be more stable, more reliable and run cleaner than two cycle carburated engines.
 
I would have voted for this answer. I found this in a Ryobi that I liberated from the dumpster.

Glad you found it.

Aaron
 
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