carburetor question

[scotcher65]

there is a drain screw on the bowl of the carb, can you drain the bowl while the carburetor is still attached to bike? Is this a good idea for getting ride of any dirt that may collect in the bottom of carb?

[Shotround]

Better to bite the bullet to open it and clean it right the first time.

[Druegeme]

I think the main purpose is to measure the float level. You get a small transparent tube and slip it on the brass connector, then open the drain valve. You can then see how far the gas comes up in the tube relative to the upper edge of the bowl.

You could also use the drain when you plan to store your bike for a while.