My riding experience: 1 day. Already I'm an idiot. This will probably be a good laugh for most of you.
I purchased a used bike, Yamaha VStar 250, <2,000 miles, <4 years old. Battery has not been replaced, but owner kept his bike garaged with the battery on a tender. I don't know how old the gas is, but it's safe to assume it's probably less than 6 months old.
I was taking a cruise to remind myself how to ride. Halfway through, stalling out on a turn, I had a mental blip. I switched shifting up with shifting down. After a few times trying to start it in 5th instead of first with the choke fully engaged, clutch in, (thinking I was stalling out), the engine doesn't turn. It wasn't until afterward that I found neutral and realized I was in the wrong gear all that time.
At first, I could hear a turning noise and the turning would stop and I'd hear a faint buzzing noise. Now I only get the buzzing noise. During the turns, you could see power to the headlamp diminish. I can hear gas sloshing around and I tried starting on the reserve, but that did nothing (can you even start a bike on reserve??). The owner warned me that I ought to fire it up soon and burn through the bas, as the tank had sat around for a relatively long period. However, it has started fine initially, when it actually was in first, and before my mental lapse as to where the gears actually are.
I suspect I may have flooded the carb by attempting to have actually accelerated the bike from a stop in fifth gear a few times. I also think there could be battery or bad gas issues.