I also noticed that I could rotate the shaft by hand about 1/16-1/8 inch before the advance springs kicked in making it harder to turn, and the rotor arm probably had 1/8 inch play in it.
Rotational play yes, I will look into distributor bushings. I added a spoonful of oil to each cylinder and 2,3,4 all came up to 125 psi while 1 came up to 136 psi, so bad piston rings maybe?
Yeah 0 side to size play. Since the oil in cylinders helped with compression I put Marvel mystery oil in cylinders through spark plug hole to hopefully free stuck piston rings if I have them. Letting it soak for 48 hours. I also put some in fuel tank and engine oil. I plan on doing an oil change after that clears the crud out.
I would look at the rubbing block on dist to see if there is uneven wear. would try another set of points and condenser to see if that is why the dwell is so inconsistent. Have never seen a dwell bounce that much.
I put my old points and condenser and no changed but instead of just cranking engine I actually started it up and checked swell at idle. That gave me a much more stable reading and I was able to adjust it to about 30.5 degrees of dwell.
that is an indication you are running lean. adjust your choke and if needed, your idle mix.
I’ve tried to adjust the mixture extremely rich (like 4-5 turns) and that seems to help slightly but it doesn’t completely solve the problem. When you say adjust the choke do you mean adjust it so where it isn’t fully opened when warm? I don’t floor it when cold unless the electric choke plate has fully opened.
Agreed
It’s a brand new carb so I don’t think my idle circuits plugged and I was having this problem before I replaced it too. It is possible that the new carburetor is jetted down however, although I’m not sure if that would these problems.
When I turn the idle mixture screw all the way in there is definitely a stumble but it will not stall. It doesn’t seem to stumble nearly as hard when increasing fuel mixture but there’s a slight rpm decrease and stumble when I get up to 2.5 to 3 ish turns out. It’s a brand new carb so I can’t imagine idle circuit is plugged or bowl not holding fuel. The mixture screw acted the same with my old carb as well.
Where did you get a new Rochester carb?
Something is wrong with your carb. It should start to stumble below 3/4 turn and die about the time you get less than 1/2 turn out
I already rebuilt my old carb and that did not my fix the problem so then yes I went with the Amazon special. Yes it most definitely runs rich when I turn it 2.5+ turns and I can smell it but I’m not able to make it stall by increasing fuel mixture.
Yeah I can hear start stumble at about 3/4 turn but I’m able to turn it all the way in without it stalling, although it will stumble hard. It’s possible my idle rpm is too high, which is in turn creating enough vacuum to continue to suck fuel through the Venturi’s. Although I’ve adjusted it to idle at 750 in gear like it’s supposed to be.
