I have this sound only and only when I park my bike after riding in the hot weather for a long time.
So what happens is I ride the bike in traffic, fan kicks in a couple of times. Naturally the engine gets very hot. I arrive home and park the bike and leave it for at least 3-4 hours. After I come back and turn it ON I get a similar sound, when the fuel pump primes itself, but I only get this sound once.
I have a theory as to why this happens but I'll let you answer first.






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