Rebuilt my Quad

[Titanic1]

I've rebuilt my quad from the ground up with new engine, wiring, carb, stator, starter, coil and everything. I turn the key, lights and fan come on, but when I hit the start button, all I get is a click from the starter solenoid. What am I missing? any help would mean a lot

 

[ArcticRider]

Take a look at the coolant temperature sensor. It's located just below the thermostat housing

 

[Titanic1]

Take a look at the coolant temperature sensor. It's located just below the thermostat housing

Thanks for this