I don't hold out much hope for the fan lasting long, especially if you live/ride in a damp humid climate, which I believe Kyushu is. I think it would be OK in a car installation (under a bonnet), but on a bike...?

Then again, you might get away without the fan on a bike, because the heatsink is exposed to the air and will naturally dissipate heat better than in an enclosed installation in a car?

I think you're just going to have to try it out and see what happens...

Just out of interest, does the fan blow air onto the heat sink, or does it draw air away from it?

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