All, been a long time. So without any apparent solution to my problem I had gone ahead and ordered a new cylinder and piston. It came all the way from Germany or Austria apparently as it took 4 months to arrived. So I put the whole thing together today, went quite well after I even got the Stihl collar for the piston and rings, it went in like a breeze.
The saw starts up OK after doing the two choke routine as described in the book, but then stalls. Starts again, idles maybe 2-3 seconds, stalls. Finally after it got warm, it would rev up and function, but as soon as off the throttle it stalls.
- Crankcase pressure and vacuum tested at +/- 7 psi
- Both engine on its own and in the saw with the Stihl intake adapter and exhaust rubber plate. The impulse line is in play as well with this adapter plate.
- Compression upon reassembly - 125 psi
- Fuel line pressure tested at 5 psi by pinching after inlet filter (not sure why the service manual calls this the fuel return line) - it's the one that is cone shaped coming out of the intake backplate
- Leakage test performed on carburator at 11 psi (this is on the port that goes to the actual return line)
- Carburetor is brand new from Stihl
- Fuel inlet filter is spotless (not new)
- Tank vent functions, holds vacuum and allows air out
- On visual, the impulse line looks fine during vacuum test (I don't see it collapsed)
I'm really at a loss and don't want toss this saw. I seem to have good spark, but the plug is practically dry. I can't help but think it's not getting fuel.
Would like any tips, please. Thanks in advance.