If the bike hasn't been started in a while, then I would suggest putting some StarTron in the fuel tank. Then turn the ignition key on and let it go through it's initial procedure, then turn it off. Do this several times before actually trying to crank the engine. Then give it a try. If it doesn't start, turn the ignition on and off a few more times and repeat.
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I have the exact same bike down to the same color. I had the exact same issue also. The first vid, was low voltage. The second vid was (I would bet anyway) a short internally in the battery. If I understand right, a battery can have the correct voltage but not have the amps needed if the cells short out.
When this happened to me, I charged the battery and it would then load the dash correctly and turn the starter. It would not start. I put a jumper pack on it and it would start but would die if I didn't rev it out. A new battery completely fixed the issue. You could try to check voltage while you are starting the bike to make sure. Lots of autopart stores will load test the battery for you, which is different from just checking to see if it has 12 volts.
I would put my money on a new battery for sure though.
Hard to say, you are going to have to start with the basics......does it have gas? does it smell like unburnt fuel at the exhaust pipe?(meaning you could have a no spark issue). You could pull a plug and see if you have spark. The battery sounds like it is spinning the motor fast enough.
Yep, there is an unburnt fuel smell at the exhaust pipe. I will check the sparks.
I noticed it started up fine before I added STA-BIL fuel stabilizer to the tank. Do you guys think that may have caused the issue?
Not really, depending on how much you used. Pull the plugs and check them with a spark plug tester, or buy 4 new ones and know they are new and good to go. Best to do it with a test though so you can actually see/know that the plugs are actually sparking. While youre there check the fuel lines coming off the tank and follow them making sure they are good to go.
Not a battery issue. I used a brand new battery and issue still persist.
You can also rule out a bad battery by jumping from a known good one, including your car. Just don't start the car. It is possible to purchase defective replacement batteries, so a known good car battery takes away that possibility.