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The fan is controlled by a thermo switch . It's located on the radiator and has power going to it always and when temp goes up it grounds circuit and fan come on.
If you have changed your thermostat then i would check and see if your hoses are not pinched also see if your radiator is plugged so it does not flow properly. Is there a water pump that needs replacing. I am not sure what all is involved but a few things to look at.
Check oil level capacity, to ensure in specs. Check spark plugs, ensure its clean and correct plug for your quad.the only other could be is ign coil breaking down when warm. Check fire at plug when this happens. First ensure oil level is correct. Make sure your electric fan is on when bike is warmed up.
There are 2 sensors for temperature. One near T stat housing for ECU reading. Other one in water passage for the light. The ECU turns the fan on by tripping the fan relay. The light comes on to tell you it's too hot. Check fan to make sure it turns. Check fan fuse to make sure it's not blown. Unplug fan motor and hot wire it to make sure it runs. If it does, locate fan relay and swap it with one of the others with the same numbers on it to see if fan comes on when engine heats up. If fan cycles normally the temp light sensor is probably bad.
Rotors are bent.... overheats pads and calipers.. OR ..caliper mounts are bent.. either way.. you have a bind that is causing the pads, calipers, rotors, and/or fluid to overheat. It just takes a few minutes to get it too hot.
You could try replacing the ignition coil. If it's failed, then it may run ok for a few seconds, but as it heats up it fails. Trying to start again immediately will be too soon for the coil to have cooled down. Leave it a few minutes to cool down and it will run again, but only for a few seconds again.
Hope that helps
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