Your owner's manual should describe the proper procedure to start that 90 hp Yammie. If you don't have one, go to www.yamahapubs.com
and take a look - use to they would let you take a look at the owner's manual online.
I looked at the carb setup for your motor in the diagram of the online catalog (above). The auto choke looks like it is a pump attached to the middle carb that is energized by a solenoid - there are two wires that lead to it. I will assume that the two wires are ground and (12 volt) command. You should be able to observe the pump being energized by removing the air silencer that is in front of the carbs. Do this when the motor is cold. I would guess the choke would energize only when the starter is engaged. The motor should start with the throttle in neutral and no extra idle added. You should be able to see fuel mist being squirted into the throat of the carbs. I am guessing at this, since I have never done it myself.
If you do not see any fuel being injected into the carb intake, then either the pump/solenoid is bad or the command from the ignition circuitry is not getting to the choke. Gonna need a voltmeter to test it at this point.
Good luck [img]smile.gif[/img] ,