March 18, 201511 yr I know there are several posts similar to this but putting them together was difficult. I have a 08 rev3 250. Have ridden it a few times for about 10 mins and as far as I can remember the fan worked and bike was quiet. Rode it today for about an hour in total. After about 20 mins could hear a rattle/tapping noise. Couldn't find it, but it seemed to be more prominent when bike was being tipped to turn. Anyway no changes in power or tell tale signs of overheating. I Stopped again to check and when looking for rattle could smell coolant. Pushed bike back to garage and checked following. The fan was not coming on. Fan - linked the two wires and fan works Coolant Level - added a small amount and radiator was full. Ran bike, coolant was still and not disturbed Drained coolant, appears to be correct qty. impeller looks good and when kick start is pushed impeller turns. Removed thermostat, carried out the boiling water test and it clicks. Any ideas, am confused now.
March 18, 201511 yr Has to be the fan switch not making contact Fit a new one and it'll work fine .Doesnt sound like you've damaged anything
March 19, 201511 yr I`d leave the wires linked together. Pat attention to the fan. When it starts going he fan just does not start, but can be pushed start from a finger. It`s electrical, forget the jitsie impellor.
March 23, 201511 yr Author Quick update to finish this off Impellor fine Cleaned connections and fan fine Thermostat fine First ride and could smell coolant again. Checked the radiator and saw that the fins were caked with mud. Power washed them through and job done. Rode for an hour or so again, then the knocking noise came back. Put fuel on to reserve and it went. I think low fuel was the noise first time around.
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