If you are running the stock carbs ? The float level height is 15 to 17 mm's. With the carb setting on a table upside down, and the bowl off, measure from the gasket seating surface to the top of the float. Top being when it is upside down. Would normally be the bottom if the carb was up right in the normal operating position. Your measurement should be between 15 and 17 mm's. If it is not adjust the height by gently bending the tab that seats against the float valve until you have the right measurement. If the level is to high it could cause your bike to run rich, if it is to low it could cause your bike to run to lean. So I would say that it is important for it to be as close to correct as possible.