Carb Mixture Adjustment

[husaindindar]

Gents. I have a 1988 140hp Yamaha 2 stroke outboard (140BETO). I'm pretty sure its the exact same motor as a 115hp and 130hp V4. The problem I'm having is that the motor is burning too lean. As I give it full throttle it bogs down but if I pull the choke for about a second it catches back on and picks up speed till the redline. I checked the carbs and they are Nikki 6L100 's. Im not sure where exactly which screw adjusts the mixture. Any help on that will be much appreciated.
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