Chainsaw Repair

Hey 660...thanks for the reply.

I did a pressure test, it just wasn't all that sophisticated.  I pressurized the saw by covering the carb w/ a 1/4" piece of plate steel I drilled holes through and using a rubber gasket.  Muffler was sealed with one of those Stihl triangular things between muffler and cylinder.  Pressurized it to about 10 psi.  The manifold got bigger, so I think I had enough pressure.

I checked the pulse tube and manifold for leaks with a soap solution.  They pass.

I did change the fuel filter, but did not change the fuel line.  I will order one of those.  Will also check cylinder base bolts. 

It feels like a fuel delivery problem to me.  The fuel tank vent on top has two fine screws- one about halfway in the line and another at the end of the line.  I took the line off completely and ran the saw and it didn't make a difference.  Are those screws correct?