I need a little scooter genius!

[stash13]

just replaced the crankshaft and it starts beautifully. problem is, it wont stay running.

Ive adjusted valves, cleaned carb, adjusted a/f, checked timing, tried an array of jets, spark plug and fuel flow is great.

any ideas?

[Rebel]

So you start it, it runs and then it dies. What is it doing while it is running. Is there any chance it could be flooding out? Could you have a vacuum leak.