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big job · 11-18-2020, 09:13 AM

My 2 cents, go back to reply #21 pull throttle down key off put hand over carburetor you have to have some suction there. If not forget the carburetor. The intake has to suck and the suck which sucks fuel from the main jet along with air we breath then the plug sparks and it goes boom so simple. I do the simple, like squirt couple pumps of oil in all cylinders
plugs back in then do the suck test > better or the same. If the same, has to be valves
are not sealing or fully seating probably from sitting so long. Very easy to pop the head and pop the manifold off gaskets are cheap. My next red neck test is to put shop air
in each cylinder listen for air from carb and air from the exhaust pipe thats valves and
probably some air from the oil fill cap tells a lot if you don't have a compression gauge.
Wops I should have said to use shop air before pulling the head.

11-18-2020, 09:13 AM	#31
big job Senior Member Join Date: Sep 2013 Location: Dighton, Mass Posts: 1,230	Re: What am I missing? 1930 Model A My 2 cents, go back to reply #21 pull throttle down key off put hand over carburetor you have to have some suction there. If not forget the carburetor. The intake has to suck and the suck which sucks fuel from the main jet along with air we breath then the plug sparks and it goes boom so simple. I do the simple, like squirt couple pumps of oil in all cylinders plugs back in then do the suck test > better or the same. If the same, has to be valves are not sealing or fully seating probably from sitting so long. Very easy to pop the head and pop the manifold off gaskets are cheap. My next red neck test is to put shop air in each cylinder listen for air from carb and air from the exhaust pipe thats valves and probably some air from the oil fill cap tells a lot if you don't have a compression gauge. Wops I should have said to use shop air before pulling the head.