I have an '02 Pampera 250 that my wife rides. The rad is small and depends a great deal on the fan for cooling, even when the bike is moving. If the fan is jammed by debri the bike will immediately overheat and blow coolant, it has happened, no mystery. We never had any other running problems though, but the bike does not get ridden a lot and when it does its just casual trail riding. I personally wrecked the rear brakes getting too aggressive on it and overheating the caliper. Had to rebuild everything. If I rode this bike regularly I would have to modify it or it would be destroyed. Two things I would do is adapt an EC airbox and radiators. Maybe drop the compression a bit as there is more than enough low end and it has a stiff kick. Its a fun, light little bike great for my wife but its no EC, thats for sure.
Partially blocked rad might do it, but I'm surprised you didn't blow half your coolant. Actually sounds like the motor had a partial seizure.
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