lucgallant
ArboristSite Lurker
Hi guys,
have a question for the experts. I've got an MS192C, about 10 years old. Bought it brand new back then. Ran good for about 6-7 years, then started giving me grief where it was hard to get warm. Once warm runs quite well, and I've done tons of tail cutting with it. Some days it started and ran perfectly and others it would stall a few seconds after starting. It always starts, it's just what it does after that that is inconsistent. I am super anal and have always ran premium and about 4 years ago I switched to Stihl Moto Mix.
So I suspected the carburetor, and bought a new Stihl one, but to no avail. I set the L and H screw per what the instruction sheet said.
Essentially it only runs if you keep pushing the purge bulb. So I suspect the impulse line preventing the fuel pump from continually feeding fuel.
Long story short I've got the saw completely apart, but the engine is still in the saw. I'm going to vac and pressure test the fuel system and engine so that I can be confident in those respects, per the service manual.
The impulse line was in place however for all I know maybe it's leaking at either end where it fits onto the fitting..
I've been browsing this forum reading about similar idling / acceleration issues and of course there are always so many possibilities.
Here's my immediate question. When I tested the compression a month or two ago, I got about 95 psi. Maybe 100 psi. Can someone who knows these saws tell me if that's decent or out to lunch? If I am going to do the piston and rings now is the best time. I don't want to get the whole saw back together and then have to dismantle it to do that.
Thanks!
have a question for the experts. I've got an MS192C, about 10 years old. Bought it brand new back then. Ran good for about 6-7 years, then started giving me grief where it was hard to get warm. Once warm runs quite well, and I've done tons of tail cutting with it. Some days it started and ran perfectly and others it would stall a few seconds after starting. It always starts, it's just what it does after that that is inconsistent. I am super anal and have always ran premium and about 4 years ago I switched to Stihl Moto Mix.
So I suspected the carburetor, and bought a new Stihl one, but to no avail. I set the L and H screw per what the instruction sheet said.
Essentially it only runs if you keep pushing the purge bulb. So I suspect the impulse line preventing the fuel pump from continually feeding fuel.
Long story short I've got the saw completely apart, but the engine is still in the saw. I'm going to vac and pressure test the fuel system and engine so that I can be confident in those respects, per the service manual.
The impulse line was in place however for all I know maybe it's leaking at either end where it fits onto the fitting..
I've been browsing this forum reading about similar idling / acceleration issues and of course there are always so many possibilities.
Here's my immediate question. When I tested the compression a month or two ago, I got about 95 psi. Maybe 100 psi. Can someone who knows these saws tell me if that's decent or out to lunch? If I am going to do the piston and rings now is the best time. I don't want to get the whole saw back together and then have to dismantle it to do that.
Thanks!
