Re: SU carb question

["Nolan Penney" <npenney@mde.state.md.us>]

When you adjust the mixture on an SU, you do it simply by raising or lowering 
the jet.
This does two things, it changes the needle relationship, and it changes the 
liquid
fuel position in the jet.  The engine is drawing a very small amount of liquid 
through
that jet, so tiny changes in that circuit have great effects on the overall fuel
mixture and how the engine runs.

Moral of the story?  Fuel float settings are critical.