Reply To: Non-start (no fuel pump prime)-new owner – 2018 Gt650r
Thermostat jammed probably , it should open and allow the radiator to get hot , there is a sensor in the bike called WTS (Water Temp Sensor) , sometimes that could also be the culprit.
Also , there is also another sensor called Fan Switch (That triggers the fan to turn on)
Fortunately, we have the service manuals in the forum which locate where they are and how to test them 🙂
Good to hear its alive and kicking!
13.5-14.5v yes to the regulator.  If it gets hot just being there, i mean hot, replace it right away.