Posted by badfish7 on April 14, 2019 at 08:49:24 from (73.176.126.64):
I have a 9n that runs fine at low rpm but coughs and sputters at higher rpm/power. The roughnerss at higher rpm smooths out of I pull the choke about halfway or so, then goes back to rough (too lean) when I let go of the choke knob. The old fuel bowl valve was missing the screen on top and clogged so I replaced it. Now I have the problem where if I tighten the bowl up to where the gasket seals and there is no leak, no fuel flows at all from the tank when I open the valve two turns (or more). I did this with a dry fuel bowl so I could see what was going on. If I loosen the bowl to where fuel flows down freely, its so loose it leaks at the seal and runs down on the engine block.
I have both a new carb and the original rebuilt marvel shebler, same with both, so I don’t suspect its the carb. Fuel line (copper) and brass are all in good shape. Any ideas?
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