Most likely nothing. If you fall over then the overflow lines will drain into the can. Some bikes consistently leak - one of the regular racers with a yamaha 450 has to drain his catch can after each moto...
Once you get your catch can setup check it after a good ride and see
Funny, I have mounted the catch can and my bike runs smoother, no surging whatsoever like it used to. Seems that the stock short carb vent tube has been causing some issues with carb and fuel delivery.
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