I had a problem with the accelerator pump on my ms250 quite a few years back. I plugged the hole and it ran flawlessly since then until just the other day. I am using the saw up in my hunting area to cut all the blow down trees out of my hunting spots. The deadfall has made it impassible for both 2 legged and 4 legged critters. Anyway, I am leaving the saw up there for the week chained to a tree and covered with a plastic bag under some pine branches. That way I don't have to pack it in and out every day.
The problem, when the saw is cold, it will fire up after three pulls on full choke and two pulls in run position. It seems to run just fine for the first tank of fuel. I run out and then go refuel it and when I get back to starting it again, it will start with full choke one pull followed by 3-4 pulls off choke, (when hot after refuel it won't start without going to full choke for at least one pull, it used to start with one pull without choke when hot). It will idle fine but when you go to full throttle, it bogs and dies. Sometimes if you get it under a load before it dies, it seems to help it pick up and go to full throttle. After messing with it trying to feather it to full throttle, and if you get it there, it will start to run just fine and run the whole tank through without any problems until you refuel again. If you shut it off, it will still start just fine as long as you don't let it sit for more than a couple minutes, after a couple minutes your right back to the bogging problem again.
Anything obvious I should be looking for. Does a saw need a retune from 30 degree weather to 90 degree weather? Like I say, once it gets up to full throttle after restarting, it runs fine from then on until you refuel again. And sometimes it seems like getting the saw under a load will help it get up to full throttle when it is bogging.
The problem, when the saw is cold, it will fire up after three pulls on full choke and two pulls in run position. It seems to run just fine for the first tank of fuel. I run out and then go refuel it and when I get back to starting it again, it will start with full choke one pull followed by 3-4 pulls off choke, (when hot after refuel it won't start without going to full choke for at least one pull, it used to start with one pull without choke when hot). It will idle fine but when you go to full throttle, it bogs and dies. Sometimes if you get it under a load before it dies, it seems to help it pick up and go to full throttle. After messing with it trying to feather it to full throttle, and if you get it there, it will start to run just fine and run the whole tank through without any problems until you refuel again. If you shut it off, it will still start just fine as long as you don't let it sit for more than a couple minutes, after a couple minutes your right back to the bogging problem again.
Anything obvious I should be looking for. Does a saw need a retune from 30 degree weather to 90 degree weather? Like I say, once it gets up to full throttle after restarting, it runs fine from then on until you refuel again. And sometimes it seems like getting the saw under a load will help it get up to full throttle when it is bogging.