Cooling problem - water is boiling
Checket the Whole system. Fan, fan "switch", temperature measurer, thermostat. Everything seems OK in accordance with the manual. -Or almost everything.
The thermostat: Checket it and it´s not stamped/opereated as mentioned in the manual, so I dismanteled the housing- took the thermostat out and reassembled the housing.
I really can´t figure out why the manual says that the thermostat should lie between 69,5 and 73,5 degrees celcius. On this particular MC and on another I´ve checket (I have 5 GPX´s) the thermostat is stamped 82 degrees and I´ve checked both in heated Water. Both opens at approx. 85 degr. and is fully open at 90 degr.
The MC runs fine and if kept on centerstand/Idle at approx. 800 revs/min it heats up to 98 degrees celcius and the fan starts. At 2500 revs/min the temp is 96.
The mc kan be ridden 15 km at 60 - 110 km/h without any bigger problems - but is warmer than normal though. -BUT if I give a 3/4 - full throttle it heat up so much that the Water starts boiling BUT the fan doesn ´t start and it´s very hard to get Down in temperature.
I think the above indicates a thermostat problem OR defective waterpump - though I´ve never heard of a defective pump........ the thermostat is removed from the housing, so it can ´t be the thermostat.
Any comments on what I might have missed ?(except for the waterpump I´ve not checked yet).
I´ve tried to the same as on cars squeez the rubber cooling hose, rev it and feel if the hose gets stiffer. Maybe I can feel a Little stifnes but not much. Any other way except dismantling the pump (all in all I´m not especially fond of timeconsuming Work - will rather ride my bike(s) ).