dead spot in throttle

[buzzstpoint]

There seems to be a dead spot in the throttle at low rpm. Mainly when taking off or doing less then 5mph and you give some gas. Not like it's coughing, but as if you were to kill the bike then hit the throttle.
If I recall right, it's about 1500 2000 rpm when this happens.
It's a pain everytime I take off from a stop.

Carbs were completely rebuilt last year, with all new seals. I'm not sure if it's an adjustment of what. I started with 3 turns out on the air/fuel, and seemed to find the nice spot of acceleration.
Ideas?

 

[16VGTIDave]

Sounds like a lean stumble. May be pilot screw adjustment, vacuum leaks, undersized pilot jets, dirty carbs, etc. I'd start with carb cleaning, bench syncing, and go from there. The number of turns on the pilot screw is irrelevant for tuning purposes.

 

[buzzstpoint]

Puled the carbs. may be dirty. found the tiny holes in the jets under the fuel bowl to be filled with a green substance. Looked like corrosion from copper. But now the floats are not working. I'm have to take the carbs off and set the float height.

 

[buzzstpoint]

Set the floats, cleaned the carbs. Fired right up. No dead spots.
Took it for a ride, no more hesitation.

I pulled the plugs.

• Right side plug, has a bit of white on half the plug. Other half looks normal.
• Left side plug has black dry soot on the plug.

Anyone good at diagnosing plugs?