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Yamaha fan kit

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Just a curiosity question, I've got a fan on both my 450 and 250 FX. When the 450 comes on it will run 20 to 30 seconds after I turn the bike off while my 250 FX fan will occasionally come on but turns off as soon as you turn the bike off. Not overly concerned but I am curious why they would operate differently. Is there a relay or anything else I should check?

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It's normal for the 250FX to shut off when the bike is off. 

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My 250fx shuts off with the bike. Interesting that the 450 continues to run. Now I'm curious in the wiring difference.

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2 hours ago, zeke383 said:

My 250fx shuts off with the bike. Interesting that the 450 continues to run. Now I'm curious in the wiring difference.

The two bikes are wired the same.  Both use the ECU to switch the ground side of the fan relay control.  It is most likely a difference in programming. 

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