Carb trouble

[Khristian B.]

I recently bought a '82 750F and I noticed, after it warmed up with the choke on, when I gave it some throttle, it sputtered and/or died or lost power just for a second until the main jets kicked in. I was getting some fuel leakage from the #1 and #4 carb overflow.  Bigger brains than mine were required to fix this so I've enlisted the aid of a couple of friends.  We've since pulled the tank, drained it, cleaned it, pulled the filter; again, clean. Next, we pulled the carbs. Filthy. Cleaned and recleaned from top to bottom and reassembled correctly (jets especially). Two of the floats and float needles, on the #3 and #4 carbs seem to be / are  aftermarket; plastic floats and needles with no adjustments. The pilot screws were all out to 2.5 to 3.5 when we first pulled off on all the carbs. They've since been turned back to 1.5. The accelerator pump diaphram on the #2 carb seemed fine.

 The carbs were reassembled and put back on; now the problems:

It ran 100% better after cleaning (of course) started right up and strong throttle right away.
It's now sat for about a week and I seem back at square one; I get the same throttle response after it's warmed up; just a touch on the throttle and it dies / wants to. I'm still getting over flow from from one carb.

Our thoughts:

The pump diaphram wasn't primed when put back on,
Carbs sync problem,
Pilot screw adjustment,
Stuck needle/ bad float

Any helpful hints would be most welcome.

[brcree]

  Hey man, I have a 76 cb750 k6  myself and had a great deal of trouble with my carbs over flowing as well.  Let me say it doesn't take much to unseat the seats. I had a augzilary tank that was open to the air. After taking the carbs off for the third time I took the seats out and examined them with a jeweler's glass. I found small bug parts between the seats....what the hek?  Well after looking into the tank I found dead mascetos. They made there way down the fuel line to the carbs. I put a filter on the gas line and no more overflow.I'm saying all this to let you know that if you have any trash in your tank no matter how small it can cause probs. It hasn't leaked since! The float bowels have a small tang on the rocker area between the posts that hold the float. You bend this tang to adj. float bowl.