interceptor carb not sucking air

[mbpinto123]

hi everyone, I have a 1969 series 2 750 that runs very good!  The problem I have noticed is that the left side carb does not have very much draw when you put your hand over the mouth.  The right side carb sucks your hand into it and will shut the engine down.
boyer ignition, timing is dead on
brand new amal carbs
recent valve job
bright blue spark
carbs are sync properly
compression is 155 on left 150 on right
bike starts first kick
left cylinder feels colder than right but eventually gets hot.
any ideas? 

[Arizoni]

Sounds to me like the carbs are not sync'd properly.
They should be both drawing in the same amount of air at all engine speeds.

[ERC]

Either your valves are NG or Arizoni is right on the money. Pull the plug wire off when running to see which one slows down or kills the motor.   ERC

[barenekd]

Sounds like the slides aren't synced. Put a finger down the carb throats and feel the slides as they start rising when opening the throttle. They should start rising together. If one starts before the other, the engine won't ever run right. Adjust the throttle cables to cure this.
Bare

[gunnerasch]

Bad seal under the carby that isnt sucking as much.

[mbpinto123]

Well I thought I had the carbs sync properly..I decide to double check and low and behold...  thanks for the suggestions....