ms 192 t hard start/stalls immediatly

goat

howdy
l'm new to this here forum

l'm a decent mechanic
but l havn't played with chain saws too much

l was just given
a 192 t

it is well used --
climbed quite a few trees

anyway

the only way l can get it started
is chain saw massacre style
( full throttle, with the chain moving)

no matter what l do after that
(try to let it idle, or keep the thing ripping)
it stalls

and takes several pulls to start again

not really sure where to begin trouble shooting...

thanks in advance
goat

windthrown

My first guess would be a bad impulse line. That is what drives the fuel pump in the carb. Its a tube that runs from the carb to the base of the engine. They can be a PITA to check and replace on many a Stihl saw though. A steady hand, long skinny screwdrivers, pliers, torx wrenches and lots and lots of cursing are usually required. I have replaced them on 200T and 020T saws, but not a 192T. I would imagine that they are the same. If its not that, check the fuel line. Any cracks or plugged up fuel filter will cause similar starting problems. Also check for air leaks (loose carb, bad crank seals), and pull the muffler to check for cylinder scoring. If it is scored bad, it is toast and there is nothing you can do but replace the P&C. Also check the muffler screen to see if it is caked up with carbon or clogged up with oil. That will cause similar issues, as will a badly clogged up air filter. Also pull the plug and check it for fouling. If it is none of those thing, reset the carb to the nominal factory setting (H, L and L/A screws) and try to start it. Maybe the carb is worn out and cannot hold a tune. I had that problem on my 020T after I replaced the impulse line. H & L adjusting screws had loose threads. I had to get a new carb for it.

goat

thanks windthrown

my instinct was that it was a fuel pump/ line issue
and wondered what that 'extra' tube was for

l'm out on ajob building a tree house
so it might be afew days till l'm equiped for proper disassembly

but the ff looked fine
and no obvious dammage to the lines

the air filter was rather clogged when l got it
but l have a new one
(and tried starting the saw with out a air filter for trouble shooting purposes)

the plug was clean

seemed like kind of a large gap
but l haven't looked up what it should be

reccon l'll check the muffler
here in the field

try the impulde lines
and fiddling with the carb
when l'm back in a shop with tools and a bench and such

goat

goat

so l checked the muffler

no clogs
though l cleaned the screen and spark arester anyway

(tried starting it with out the muffler too)

cylinder didnt seem badly scored

fixed the plug gap
(it was way off)
(gaped it by eye since l dotn have a gague here)

did soem fiddling with the carb screws

it starts easier now
though l stil have to start with the throttle engaged and the the brake off

but it only runs if l keep it at full throttle

dies if l try to idle

and after a few seconds it starts to surge

the carb floods and spits gas

after a little of that it stalls

thoughts?

so thats all for today
back to work you know

goat

Garry Brockley

you clutch springs sound like they need doing, clutch is constantly engaged.

__________________

Eric Frei

It's sucking air I bet, maybe crankcase seals ?

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sharkey

How bad is the cylinder scored? Rebuild your carb, reset the needles and check your intake boot. When the saw is levered on the intake boot tears. Here is a 4 part video series that will walk you through the repair;

goat

thanks yall

l dont really know how bad is bad
on the cylinder scoring

but it didnt look bad to me....

l'll rebuild the carb and check the boot
(thansk for the link)

when l'm back in the chop her ein a day or two

goat

goat

so l know this thread is like a year old
but l'm finally getting around to working on my 192

(it was on the back burner, trucks to fix; houses to build -- haven't been doing much tree work)

any way
one little question
which one is the impulse line?

(any one have an exploded diagram for these saws?)

thanks
goat

goat

well l finally took a real look at the saw
(l dont have internet where l am working)

pretty easy to figure out how it works and all
which line is which etc

boot is fine impulse line is fine
carb diaphragm is fine

but the cylinder/piston is toast
(dont know how l missed that the first time around )


gonna look into replacement parts

but for now l have a cute little door stop

thanks again

goat