Motor was ticking loud,parked it and the motor made a noise , now the starter is just spinning, could it be the flywheel?

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.

I don't know year--make--model? Use a digital multimeter across battery post, everything off. The generic spec for a full charge is around 12.6 volts. Generic info says if it gets down to 12.4 volts or less, get it charged. Check your charging system. Check flywheel teeth and starter drive gear, see if looks ok.
You can do voltage drop test for starter motor circuits. If you try that, make sure tranny is in park or neutral and parking brake is set. You may be way ahead of me with your testing? Just my opinion.

If the starter spins but does not engage the flywheel, either the starter is faulty or there are teeth missing from the flywheel.

When buying starter motors it is essential that the starter pinion teeth are of the same pitch as the flywheel ring gear. Not all starters from the same make fit different engines because of this problem. However I would be checking that I had put the starter in the housing properly as any misalignment will cause your problem

If I understand your statement correctly, noise but the engine will not "turn over." This sounds like the starter motor is running but the gear that engages the flywheel gear-teeth is not making contact at all or is moving into too-slight contact, just enough to make a lot of noise. In U.S. cars the device on the stater motor that moves the starter gear forward is called a "Bendix." As the starter motor starts to turn, the Bendix shoves a small gear forward, engaging teeth on the flywheel which spins the flywheel to start the engine. If the Bendix is sticking or has failed the gear will not move forward at all or not far enough.

Sarting with the least cost first, I'd look toward a "sticky" bendix. Try using a light penetrating oil or perhaps, WD-40 to free-up the Bendix.

sounds like your starter needs shimmed and/or replaced or you have a flat spot on your flywheel. the sound your hearing is from the starter motor gears not properly aligning with the flywheel gears and quite literally grinding material off of one or the other. if you continue to force it your flywheel will need replaced if not already

The teeth on the flywheel need to be close enough for the starter motor to catch them when it engages. If you removed it and now the starter just free-spins when starting then you may have installed the flywheel backwards and the starter motor cannot reach the teeth on the flywheel. If its making a loud grinding or pinging sound you may need to manually turn the engine a bit to align the flywheel.

The grinding noise is the starter hitting the fly wheel. This means that the starter is spinning but may not be engaging all the way. Your Flywheel is probably missing a few teeth now. I recommend replacing starter and flywheel. If you're on a tight budget then you could just replace the starter but it will cost you more in the long run.