Derbi gpr overheating full rebuild but after 10 mins heat warning light comes on.water pump is fine

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Hi, Neil and the usual suspects are:
1. Low coolant level.
2. Restricted radiator air flow.
3. Faulty thermostat.
4. Coolant pump or fans inoperative.
5. Vent hose crimped.
6. Air in the coolant.
For more information about your issue and valuable "FREE" downloads that you will need please visit the websites below. Good luck and have a nice day.
derbi gpr 2007 cooling system problem
2001 Derbi GP1 OVERHEATING
https://scootergrisen.dk/scooterhjemmeside/download/derbi_gp1_servicemanual.pdf
https://www.oemmotorparts.com/oem2.asp?M=Derbi
http://www.derbi.com/fr/images/stories/modelos/37/manual.pdf
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