willbarryrec
ArboristSite Operative
Hey folks.
I thought I was doing all right on fixing saws but this one has got me licked and I need a mental kick in the pants......So of course I thought of you all!
Anyway Stihl Ms 200t my arborist buddy gave to me after his dad slightly ran up on it with a truck :msp_scared:...Broke the chain brake,clutch cover and a few other minor things....It was still running but he said it didn't owe him anything.
So I tore it down,Vac tested it and checked out the P/C.....which was slightly scored on the exhaust side ..It looked to me like the saw had been running rich, built up some carbon and the carbon smeared the piston around the rings......I thought the piston and cylinder cleaned up well with some acid....I got some rings from the bay and put it back together and now it runs but.........
It will fire up and even idle at first but at full throttle it seems to load up like it's getting too much mix...it will bog down and struggle to keep running and at idle down it just quits,it will restart with a few pulls and holding full throttle....I really think it is flooding out and just getting way too much fuel.....but why?
The compression seems to be good .
I put a carb kit in it and made sure the gaskets were in correctly.
I adjusted the carb to factory settings? 1 1/4 turns out on the low and the high has a limiter cap ,I set that in the middle of it's range.
I have tried adjusting the metering lever down until it won't pull fuel anymore.
I pulled the exhaust and made sure that nothing funky had happened..nothing I could see.
I looked at the impulse line and it looked fine.
I thought about the tank vent acting up and pressurizing the tank...pushing too much fuel thru the carb?
I haven't messed with tank vents too much,it does seem like if I run it with the air filter off so I can see it will squirt some fuel out the vent every so often... is that normal?
When I run it for a minute the fuel tank will hiss at me when I crack it open....but a few of my other saws do that too?
Anyways I would really like to get this thing running right and thank you all in advance for your help!:yourock:
I thought I was doing all right on fixing saws but this one has got me licked and I need a mental kick in the pants......So of course I thought of you all!
Anyway Stihl Ms 200t my arborist buddy gave to me after his dad slightly ran up on it with a truck :msp_scared:...Broke the chain brake,clutch cover and a few other minor things....It was still running but he said it didn't owe him anything.
So I tore it down,Vac tested it and checked out the P/C.....which was slightly scored on the exhaust side ..It looked to me like the saw had been running rich, built up some carbon and the carbon smeared the piston around the rings......I thought the piston and cylinder cleaned up well with some acid....I got some rings from the bay and put it back together and now it runs but.........
It will fire up and even idle at first but at full throttle it seems to load up like it's getting too much mix...it will bog down and struggle to keep running and at idle down it just quits,it will restart with a few pulls and holding full throttle....I really think it is flooding out and just getting way too much fuel.....but why?
The compression seems to be good .
I put a carb kit in it and made sure the gaskets were in correctly.
I adjusted the carb to factory settings? 1 1/4 turns out on the low and the high has a limiter cap ,I set that in the middle of it's range.
I have tried adjusting the metering lever down until it won't pull fuel anymore.
I pulled the exhaust and made sure that nothing funky had happened..nothing I could see.
I looked at the impulse line and it looked fine.
I thought about the tank vent acting up and pressurizing the tank...pushing too much fuel thru the carb?
I haven't messed with tank vents too much,it does seem like if I run it with the air filter off so I can see it will squirt some fuel out the vent every so often... is that normal?
When I run it for a minute the fuel tank will hiss at me when I crack it open....but a few of my other saws do that too?
Anyways I would really like to get this thing running right and thank you all in advance for your help!:yourock:
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