Scoutboy74
Moderator
If the throttle plates are hanging in their bores at any point, that's a problem. You need to be sure of this, as fixing would require carb removal. I suggest having the throttle cable and return spring completely unhooked so you can manipulate the throttle linkage by hand with no other influencing factors involved. If you feel the linkage bind at all, the carb will need to come off for a throttle plate inspection and adjustment. A plate misalignment would have a negative impact on vacuum at idle as well.
I don't see you needing larger jets. There's some other explanation for these oddities, and I think the answer lies elsewhere within your carb. How's that for ominous? I've yet to be impressed with a remanned carb. The attention to detail and quality control just isn't there like it should be. The gaskets and other wear parts are often of poor quality. Your fuel bowl gasket being just one example. If we completely dismantled this carb, I bet we'd find others. We May eventually reach a point where you will have to decide if putting up with decent to slightly erratic operation is something you can live with for awhile or not. I'm not giving up or losing interest. I'm just being real. There are only so many external tweaks, fiddle-diddles and experiments to try. The next level is a bit more involved. As in pulling the carb apart for a do over on the rebuild. We're not there yet, but that decision May be on the horizon.
You're essentially right about the mix screws. They restrict fuel flow at idle. The further clockwise they are turned, the greater the fuel restriction, or leaner the mixture. Whichever you prefer. Right now, your idle mix is towards the Rich end of the spectrum.
I don't see you needing larger jets. There's some other explanation for these oddities, and I think the answer lies elsewhere within your carb. How's that for ominous? I've yet to be impressed with a remanned carb. The attention to detail and quality control just isn't there like it should be. The gaskets and other wear parts are often of poor quality. Your fuel bowl gasket being just one example. If we completely dismantled this carb, I bet we'd find others. We May eventually reach a point where you will have to decide if putting up with decent to slightly erratic operation is something you can live with for awhile or not. I'm not giving up or losing interest. I'm just being real. There are only so many external tweaks, fiddle-diddles and experiments to try. The next level is a bit more involved. As in pulling the carb apart for a do over on the rebuild. We're not there yet, but that decision May be on the horizon.
You're essentially right about the mix screws. They restrict fuel flow at idle. The further clockwise they are turned, the greater the fuel restriction, or leaner the mixture. Whichever you prefer. Right now, your idle mix is towards the Rich end of the spectrum.