Too rich

poptheclutch wrote:

By " throttle plunger" are you referring to the slide aka piston valve in parts diagram, or is that something else ? 

Sorry, Yes I'm talking about the throttle slides. If they are hung up slightly, then the metering rods (needles) are higher allowing a richer amount of fuel to flow from the mains when the air flow is high enough to pull fuel from the mains.  As I mentioned before, you shouldn't see any fuel flow from the mains until about 1500-2000 rpm on acceleration.

With the engine stopped, you should be able to raise the plunger with your finder and release it and hear it drop hard with a click sound at the bottom of its stroke. If they don't drop with a click, then you should figure out what's hanging them up. Either hardened diaphragms or dirty throttle slides or........

Slides are working like they should. Whatever is going on it's on all 3 carb bodies, as there is fuel pooled in all the intakes, all the plugs are sooty. I'm thinking it's something with starter circuit.

 The starter plungers appear to be sealing. One thing I thought odd was, I flushed thru the starter pick up tube to check seal of the plunger. When I did the alcohol I was using came out from around where the tube goes into the carb body (looks like a little well there) as well as the hole where it is supposed to come out of when the starter plunger is raised.