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the thermostat may not be working correctly. if it were not the rad fan would not come on. there is probably a test in a workshop manual (probably involving water at a set temp).
even if the pump weren't working the water would get hot because it is sat within the barrels of the motor absorbing heat. if the pump weren't working the water wouldn't be driven through the rad to cool it.
it may have been that the old coolant had too much water or been topped up with too much water?
it could also be that the coolant level had dropped too much and allowed air into the system which will allow the motor to get way too hot.
if you've emptied the system and refilled with fresh coolant. run the motor (waited for it to cool) and topped up at the filler and it seems ok I'd put the bike on the stand and run it at a standstill until the rad fan comes on. stay near it incase the temp warning light comes on. if the light is on, but no fan you'll haver to check your fan and the wiring from it.
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