LittleTree
ArboristSite Lurker
Hi there, finally decided to post a thread after quite a bit o research and not so many results.
I rebuilt a M2 550xp. Went through ALL of It, from the crank bearings to the new Spark plug. Pressure/vac tested the case, It Is good. Went for a little break in and some small cuts, and the saw Will not idle for more than a few seconds. Also, when being able to keep it alive enough to pull the throttle, It Will hesitate a bit before getting the higher rpm. Sounded like a spark issue, checked the Spark, nice and Blue. So I pulled the carb and pressure tested It. Metering side diapghrams were leaking. So I replaced them, put the saw back together and tried to start it. Same problem again. After that i remembered that i forgot to vacuum test the carb from the primer bulb nipple, so i tore the saw down again and vacuum tested the carb. It will not hold the vacuum. Seals and diapghrams, all good. Looking on the internet i came to the conclusion that there Is some fuel check valve around the carb which Is not sealing correctly.
When vacuum testing the carb, i am able to hear a little noise of air sucking in somewhere into the venturi, but to find out where exactly from isn't a thing to me. Wrote here to know if some of the experts knows where i should look and maybe what to do.
I rebuilt a M2 550xp. Went through ALL of It, from the crank bearings to the new Spark plug. Pressure/vac tested the case, It Is good. Went for a little break in and some small cuts, and the saw Will not idle for more than a few seconds. Also, when being able to keep it alive enough to pull the throttle, It Will hesitate a bit before getting the higher rpm. Sounded like a spark issue, checked the Spark, nice and Blue. So I pulled the carb and pressure tested It. Metering side diapghrams were leaking. So I replaced them, put the saw back together and tried to start it. Same problem again. After that i remembered that i forgot to vacuum test the carb from the primer bulb nipple, so i tore the saw down again and vacuum tested the carb. It will not hold the vacuum. Seals and diapghrams, all good. Looking on the internet i came to the conclusion that there Is some fuel check valve around the carb which Is not sealing correctly.
When vacuum testing the carb, i am able to hear a little noise of air sucking in somewhere into the venturi, but to find out where exactly from isn't a thing to me. Wrote here to know if some of the experts knows where i should look and maybe what to do.
