edmxz2002
ArboristSite Member
I have a 2019 550xp mk2 that's revving high then stalling.
Cold start, choke for 3 pulls, shut choke off pull 1 or 2 pulls it starts. Runs a little rough. Blip the throttle and it either dies right away or the rpm's race up to full throttle for 3 seconds then dies.
I have read about setting the auto tune by idling for a few minutes then running at full throttle while dragging the chain down a log. I can't do that because it won't go to idle and goes full throttle with the trigger released.
Things I have chaced include removing the muffler and checking piston. It looks perfect. Removed carburetor and opened it up and cleaned it. It looked spotless and the diaphragm and gaskets are in good condition. Held 10 psi for over 5 minutes when checked from the end of the fuel line in the tank.
I checked compression and got 120psi on my gage that I know reads low.
I removed the clutch, oil pump and flywheel to get a look at the crank seals. I think I am looking at the bearing? Not like crank seals I have replaced or seen on other saws.
I have a vac/pressure tester but I don't have anything or anyway to block the intake.
Any ideas or directions on what I should check next?
Any help will be greatly appreciated.
TIA.
Cold start, choke for 3 pulls, shut choke off pull 1 or 2 pulls it starts. Runs a little rough. Blip the throttle and it either dies right away or the rpm's race up to full throttle for 3 seconds then dies.
I have read about setting the auto tune by idling for a few minutes then running at full throttle while dragging the chain down a log. I can't do that because it won't go to idle and goes full throttle with the trigger released.
Things I have chaced include removing the muffler and checking piston. It looks perfect. Removed carburetor and opened it up and cleaned it. It looked spotless and the diaphragm and gaskets are in good condition. Held 10 psi for over 5 minutes when checked from the end of the fuel line in the tank.
I checked compression and got 120psi on my gage that I know reads low.
I removed the clutch, oil pump and flywheel to get a look at the crank seals. I think I am looking at the bearing? Not like crank seals I have replaced or seen on other saws.
I have a vac/pressure tester but I don't have anything or anyway to block the intake.
Any ideas or directions on what I should check next?
Any help will be greatly appreciated.
TIA.