Ugh...more work, same outcome. @#$%^&*
I have been working every day straight since Memorial Day, so progress has been slow on this engine. Tonight, I wrapped it up again and restarted it. Same as before, immediately starts surging.
This time, I:
-inspected all parts of governor linkage, found no flats or sticking spots
-removed sump, removed rod cap, removed crank. Inspected governor/oil slinger, all bearing surfaces, and camshaft. All good, no issues. Had to replace a seeping lower crank seal anyway, also replaced PTO side shaft seal.
-I did find something bad. There are very noticeable scratches, even call one a gouge in the cylinder, could see them from the bottom of the bore, looking in the crankcase. This could mean broken rings. Leakdown showed leakage out the exhaust valve, not the breather tube...
-removed head, removed and relapped exhaust valve, reset clearance to .008" Cleaned head and deck surface, installed new head gasket. I noticed an oil sheen on the piston, combustion chamber, and tops of the valves. Could be oil ring is broken. However, spark plug was not oil fouled.
-reinspected intake pipe again, reinstalled with new gasket, used tiny inch pound torque wrench to general specification for #8 hardware.
-performed static governor adjustment
Running out of ideas...I am considering putting on a different intake pipe, just because I have one. I am also considering installing a 'test' bowl nut that I have. The main jet in the bowl nut has been opened up slightly with pin drills.
We shall see...
Seth K. 'lousy witchdoctor' Pyle
Nothing is sailor-proof...