Maybe someone knows something about a very unstable engine run.
I have a 9HP Ariens sno blower, and the motor races up and down in a continuous cycle. It races up and it races down, ad infinitum.
When under a snow throw load, it normalizes, but once you are in a no load situation, it races, such as in a turn or at idle.
It does this with the tines engaged or off.
One clue is if you apply the choke at halfway, this cuts the extreme RPM range in about half.
Vacuum leak?
I have a 9HP Ariens sno blower, and the motor races up and down in a continuous cycle. It races up and it races down, ad infinitum.
When under a snow throw load, it normalizes, but once you are in a no load situation, it races, such as in a turn or at idle.
It does this with the tines engaged or off.
One clue is if you apply the choke at halfway, this cuts the extreme RPM range in about half.
Vacuum leak?