Did you make sure that it has the proper coolant mix ratio as it sounds like it has a large % of water ! it must have the correct mix ratio to maintain proper temp ! It might look like it has the correct mix because of the colour but if you have not done a coolant change your self then there is no way of telling if it is correct so I would flush the system and replace it with a recommended brand and mix ( some are already pre-mixed )
SOURCE: '01 GSXR 1000 won't start at temps above 170 or so.
Check the coolant sensor.Probably reads to the ECU that the engine is cold while it is not and the ECU injects more fuel that it should.Unscrew the coolant sensor (it is located on the cylinder head or on the thermostat casing) and boil it in water and measure it's resistance before (cold) and after boiling it (hot).It should not be the same.
SOURCE: bike starts and stalls, then doesn't turn over.
if it won't turn over when it's standing, but will when it's not, then it's a pretty safe bet that it's an electrical short!
SOURCE: 2005 Rmz250 wont start when hot.
YOUR BIKE HAS A POWER VALVE (DIAPHRAM FUEL PUMP) THAT GIVES A SHOT OF GAS EACH TIME THE THROTTLE IS TWISTED. WHEN THE BIKE IS HOT, IT FLOODS EASILY. DON'T HIT THE THROTTLE WHEN STARTING THE BIKE WHEN THE ENGINE IS HOT.
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