New answers tagged scooter
I think the fuel pump is a good place to start. I believe this scooter doesn't actually use a fuel pump, but a fuel diaphragm. I found two versions on this website which should be for your scooter.
As was noted in the comments, the problem is probably that there is a key in the splines and the pulley which needs to be aligned in order for it completely fit onto the shaft. While this is not your piece, it will show you exactly what I'm talking about. The splined area has a keyed area which is visible: The crankshaft will have one which is opposite ...
The 'worst case scenario' that I can think of is this. Your spark plugs become fouled because the motor ran too rich and the bike doesn't start. You would need to remove the spark plugs and clean them with a carb or brake cleaner and re-install them. Don't worry about your vehicle. It's fine.
It will not damage the engine at all. All that will happen is that it will run richer, thus using more fuel. If you did it for thousands of miles you'd probably end up with more deposits in the engine/exhaust, but even that is easy to sort.
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