Before you do all that, bang the end of the starter with the handle end of a hammer. Hammer head and hammer haft in line with the starter, rather than tapping it with a wooden stick. The idea is to jolt the bendix on the starter. Centrifugal force thrusts the starter drive cog onto the flywheel and then after starting it withdraws. Yours is stuck, the hammer trick can free it.
First check your battery is fully charged. A starter motor takes a lot of voltage to spin an engine over. Usually around 9 volts on a 12 volt system. Do you get any other noises like clunks, 'machine gun' style clicking?
The sound your describing is possibly the starter motor spinning but not 'catching' the flywheel. You'll need to remove the starter motor for this to check why it's not engaging. It could be a worn starter motor or the drive teeth to turn the flywheel could be worn.
How old is the bike? Starter motors do wear out, especially if they are used regularly.
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