The Ford Barn - View Single Post - Why do I have to keep pulling the choke out ?

40-A Twins · 11-02-2020, 02:03 PM

Thanks for all the tips.
I started it up today with the gas cap off and no improvements, so we can rule out plugged gas cap.
I adjusted GAV from closed to open 1 turn trying to find a spot where it ran good but no big improvements.

I always drain the gas by removing the carb drain plug, and it dribbles out a good rate.

Exhaust stinks like it is running too rich.
Gas is dripping out the back of the carb so the float valve is leaky.

I aimed propane into the carb intake and it sped up. I was trying to use propane to search for manifold leaks but fan wash is probably diluting the propane too much to be useful.

I looked over the intake manifold when replacing the gaskets a few days ago and did not see any cracks. Manifold flanges looked good.

It runs just as poorly when I put a Tillotson carb on.

Is it time to open up the motor and check tappet clearances ?

11-02-2020, 02:03 PM	#17
40-A Twins Senior Member Join Date: Oct 2020 Location: Oregon City, OR Posts: 121	Re: Why do I have to keep pulling the choke out ? Thanks for all the tips. I started it up today with the gas cap off and no improvements, so we can rule out plugged gas cap. I adjusted GAV from closed to open 1 turn trying to find a spot where it ran good but no big improvements. I always drain the gas by removing the carb drain plug, and it dribbles out a good rate. Exhaust stinks like it is running too rich. Gas is dripping out the back of the carb so the float valve is leaky. I aimed propane into the carb intake and it sped up. I was trying to use propane to search for manifold leaks but fan wash is probably diluting the propane too much to be useful. I looked over the intake manifold when replacing the gaskets a few days ago and did not see any cracks. Manifold flanges looked good. It runs just as poorly when I put a Tillotson carb on. Is it time to open up the motor and check tappet clearances ?