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Radiator Fan - '04 Rev3 250

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The fan on my bike pretty much runs all the time. Have new coolant, impellar is fine, bike runs good. Seems like it should cycle on/off more often but I'm new to the bike. Is this normal?

Ambient conditions are on average 16C (60F).

thanks.

if the fan is definitely cutting in and out then it is probably a faulty thermostat, if the fan runs right from a cold start then somebody may have wired it on permanently as a workaround for a faulty thermostat.

I dont think the rad cap would be the problem, providing that it isn't losing water from it.

16 degrees C is quite warm though, and you would expect the fan to run regularly under these conditions, depends how you ride the bike too, how fast and at what rpm etc.

Bob

  • Author

Thanks for the tips!

Out of curiosity, what are the signs that the bike is overheating or very near, less spewing coolant from the cap?

thanks.

If the bike is overheating then you will notice that it will pink and knock a lot, it might feel like it is starting to bog down when you open the throttle.

Providing that air can freely pass through the rad then I shouldn't have thought that it is overheating, the fact that the fan is running a lot suggests good circulation of coolant to supply heat to the thermostat. I would put my money on a sensitive thermostat, perhaps worth checking your carburation, too lean and it will run hot as well, although that is the last point of call.

Good luck,

Bob

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