I have a GTS150 and just modified my electric choke. Inside the choke i was led to understand is a thermal arrangement using a resistor. When cold and the engine is started, the solenoid pulls a pin away from the carb that allows extra fuel into the engine. Over a short period this resistor reduces the voltage to the coil and the coil eventually drops out returning the carb to normal. There should be five wires coming from the rectifier pack under the lid in the large box to the left of the engine, the 5th wire goes to the choke coil and the other wire from the choke coil goes to ground. There should be a 2 pin connector floating around in the box for the choke one wire is coloured Brown (12v feed) and the other is Green (ground or 0v). With mine, i simply fitted a dash switch from a 12v supply to the coil and the other side of the coil to ground. This should manually control the choke.
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I started out with absolutely nothing and still have most of it left 
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