okay.. test it out... get your moped set on top of a point. so it can lean side to side, unless you hold it up, having the back tire off the ground. Rev the hell out of it. get it up as fast as you can... now see how long your bike balances. NOT long, because even though, at higher speeds a gyroscopic force can be made, it won't hold it up long. it is NOT what keeps your bike from falling over when you ride.
you could get more forece yet by adding balanced weight to the outer edge of your wheel, but it still wouldn't be enough to "balance" your bike. Yes, you could feel the gyroscopic force at those speeds, but that little bit isn't nearly enough keep you balanced. On larger motorcycles, this force certainly increses. it would keep you upright alot longer, but even at a constant speed with the gyro-force, it won't keep there.
Oh well, I hate arguing over something so meaningless anyway. But physics is physics.