Allis 190

Was round baling hay today with the 190. I recently tuned ,plugs cap points and rotor. I timed it 26 degrees before top dead center at 2200 rpm's. Okay this machine seems to have an errant missed cylinder at around PTO speeds. As it heats up to working temperauter it sometimes gets worse seems like a dead cylinder but dont believe so. Oil never shows water, water never shows oil. I t has a new coil so spark is good. When its working temperature and shut down it is extremely hard to start. Is this fuel vaporization? It has the mechanical pump and fuel line around the back of the block could the fuel be boiling? As for the errant miss it is erratic and not timing or spark? a valve? or could this also be fuel troubles? Any help will be great.                                                                                           JerryM(IL)

 Yes the plugs show some but not excessive over fueling but are all ash grey at the tips, carbon from the gas not oil.  Also new condensor at tune up new air cleaner. This errant miss is worse on rough ground, but I know all the wires are snug new copper ones and well crimped. Could it be ballist resitor break down? I will run a compression test in a day or two but believe all the cylinders run 130 or better. This miss is wide spread might my one and a half rounds in the field then a subdued pop(miss) then make another round before it happens.

might check for slop in the Distributor shaft. mine gave me fits until I replaced it with a reman unit. I found out there is a lube schedule for it that Dad or I never did.