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66 carb prob? Something else?????????

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mike:
Ok, 66 coupe autolite 4100. Rebuild 10 months ago. Car used once or twice a week. Car can be sitting for a week or a day... step on the gas once, close plate, step on the gas one more time to pump some gas...turn the key, and it's magic! starts right away. No hickups, no smoke, no gas smell. fast idle kicks on and it's all good. Turn the car off, back on again and no problems. Let it sit for 15 minutes, and it's a whole different ball game. It does not turn...and when it does after 10 or 15 seconds of turning the key, it starts very sluggish, ruff, with gas smell and some smoke.As it gets going it eventually smoothes out.  I have tried adjustng the choke spring so as to keep it open or closed longer. no luck. I was told that maybe the power valve on the carb was bad. I had the carb checked by the same guy who rebuild it. He adjusted the floats and change the power valve gasket. He idin't think that was the problem as there was no gas sitting in there. "Long story short... ruff starting after sitting warm and sitting for some minutes?????
Thank youuuuu

66GTKFB:
Think about technique. When you start warm, do you hit the accelerator pedal? Do you 'pump it' after a second or two? Do you floor it? Do you start without touching the pedal (recomended technique in the book)? Remove the air cleaner and observe what happens when starting (use a helper to start the car).
Jim

Soaring:
With that 4100, don't pump it after the car is warm.  That will flood it. Just slightly push the gas pedal down maybe an inch or so, then start it.  Like Jim said, it's all in the technique of what you do to start it.  If it does get flooded, then push the pedal to the metal and start it. 

mike:
ok, tried all of the above. starting without touching gas pedal. once all the way before starting. slightly before starting, slightly after trying to crank, all the way after trying to crank, slightly after it starts, couple of times after it starts... sluggish, and then it starts smoothing out.????

Soaring:
It's flooding if you have a strong gas odor after it starts.  Do you notice a big puff of smoke coming out your tailpipe as soon as it starts?  You may as well just take the carb off and put a new kit in it.  That's what I would do.  Apparently your mechanic friend didn't know what he was doing. 

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