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Pretty normal I believe mate, here's how I think it works: When your bike in the "on" or "reserve" positions fuel will only flow when there's vacuum, so when you turn the bike off the fuel delivery stops. When you don't get reserve turned on in time the carbs run dry and the bike stops. Off bike = no vacuum = no petrol to carbs = won't start. Some bikes have "prime" instead of "off", and when the carbs are dry you switch it to prime, the carb bowls fill with petrol, and off she goes. Without a prime setting, you need to get vacuum happening (hit the starter) and wait for the petrol before it'll kick.

Justin.
 
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