WOT = Wide Open Throttle

Plug chop - going WOT and killing the motor (clutch in so motor stops spinning). You then pull the plugs to look at color. This method gives you a broad indication of rich/lean of your main jets. Bring gloves, plugs are hot!!

Here's a good plug color 'chart' with pics:
http://www.verrill.com/moto/sellingguide/sparkplugs/plugcolorchart.htm

Changing your idle circuit via the air screws does not affect fuel. They control air...

"Never underestimate the power of human stupidity" - Robert Heinlein