MS290man
Super OPE Member
I know if you have a saw with a burnt piston you should run a pressure check to make sure the seals are still good but what other symptoms would also lead you to run a pressure check?
Finding an elusive air leak before it blows up. Sometimes on a saw that seems impossible to dial in. Sometimes you get one of these and it's best to do the pressure test early and determine if the does or doesn't have a leak. Can save a lot of time in the long run.
Could something be wrong with my mityvac?
Test it.
When I place my thumb on it the gauge reads pressure and vacuum.
Then I would say it's fine and you're overlooking something else in your testing method(s). Don't forget decomp buttons and spark plugs as leak sources along with the cylinder base and case seams. Your blockoffs are also obvious places to look for leaks.
What are you using for a test point?
Thought you were a chain guy
I have tried to vacuum test and pressure test many saws and I cannot get a single one to pass and cannot find any leaks with soapy water. Could something be wrong with my mityvac?
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