FS80 - What's wrong with my trimmer?

[joatmon]

I have an FS80 I bought during the summer of 01. It's hasn't really been running too good for quite some time. It usually starts and idles fine. It "stumbles" on acceleration. When warm, it seems to get worse. Sometimes, it won't even rev close to it's potential.

Last spring, I took it apart and could find no problem. New plug, new fuel filter, carb looked good, no leaks I could see. Late in the fall, I took it in for service. They put in a new plug, new fuel filter, cleaned the card, looked for leaks, etc. It appeared to be a bit better, but I only used it twice before season end.

This spring, it was running worse than ever. On April 3rd, I lost my patience (good thing I'm not a real doc) and took it back for service. New this, new that, tried a new carb, and still wasn't running right. Tonight, the tech found the problem.

Any takers?

Joat

 

[blsnelling]

Sounds like the L needle is too lean OR exhaust screen carboned over. Yeah, that's it.

 

[joatmon]

Sounds like the L needle is too lean OR exhaust screen carboned over.

Brad,

No and No.

Thanks for playing,

Joat

 

[Fish]

air filter dirty/restricted exhaust?

 

[Honkie]

Dad's fs80 did the exact same......bought a new carb and fixed the problem

 

[tamadrummer]

Check your flywheel gap and also check your ignition coil. It is about the time for that to be giving you trouble.

 

[joatmon]

air filter dirty/restricted exhaust?

Fish,

No and no.

I Stihl respect you Fish,

Joat

 

[joatmon]

Dad's fs80 did the exact same......bought a new carb and fixed the problem

Honkie,

No, the new carb gave same results.

Joat

 

[joatmon]

Check your flywheel gap and also check your ignition coil. It is about the time for that to be giving you trouble.

TD,

Gap is good and coil is mister sparky.

Joat

 

[joatmon]

hmm it was the coil. as it warmed up it started getting weak spark. am i right doc

NC,

Good try, but the coil is fine.

Joat

 

[tamadrummer]

Operator forgot to put fuel in said equipment, keeping piece of equipment from achieving full potential.....:censored:

Im out.

 

[Honkie]

String to big, the cetane rating of your diesel is to low, you have to tune it in the cut, wiggling pin fell out of the wobbling hole.........

 

[joatmon]

Operator forgot to put fuel in said equipment, keeping piece of equipment from achieving full potential.....:censored:

Im out.

TD,

I'm a poor operator, but come on.

Joat

 

[Fish]

Trick question....

Points and condenser

 

[joatmon]

String to big, the cetane rating of your diesel is to low, you have to tune it in the cut, wiggling pin fell out of the wobbling hole.........

Honkie,

Ah, well, hadn't thought of that. Tell me about your hot rod trimmer.

Joat

 

[joatmon]

Trick question....

Points and condenser

Fish,

No.

But I maybe think I Stihl respect you,

Joat

 

[Fish]

well you said you bought it in 01, you didn't say new.

Most guys here don't even know about being two fs80s, the old one being older than they are.

 

[NuConcepts]

this is a fun game. ? hmm it has a good coil, good spark, its getting fuel. exhaust is good. if the tech looked at it must have a good piston. but it has to be something the tech would over look such a gas cap or tank vent

 

[Fish]

You are probably right, I check that without thinking, but it has not been brought up yet, good one.

 

[MrGiggles]

Crankcase vacuum?