1. Engine completely rebuilt a few years ago - running fine
2. Full tank
3. New AGM batttery
4. Start engine - runs fine - drive 1 mile and stop for 30 min.
5. Get back on bike. Engine restarts fine.
6. Idle for a minute with petcock on Fuel
7. Suddenly - engine starts to die, as if there is no gas.
8. Crank engine - won't restart
9. Set petcock to Prime and crank again.
10. Eventually engine restarts.
11. Idle with petcock on Prime for a minute.
12. Engine again dies as if there is no fuel.
13. Restart engine with petcock still on Prime.
14. Engine restarts eventually.
15. Move Petcock back to 'Fuel and ride bike a few miles - runs fine.
What's going on ?? Has never happened before.