Originally Posted by wingracer

Yep.

Most all onroad motors have short needle carbs so the minute you touch the throttle, only the HSN is in control of the fuel. LSN only controls it at idle unless it is so rich that it floods the crankcase and can't clear it all out quickly. A good, high timed onroad motor will often not let you go very lean on HSN before the classic lean bog hits. It's kind of a nice, unintended safety feature