Originally Posted by Airhead Wrangler
Who made that rule? Needle position and main jets aren't adjusting the same thing at all. Your needle regulates mix from idle all the way up to WFO, Whereas your main jet just limits the amount of gas at WFO and just below.
+1 I have head the 'one notch equals two needle jet sizes' before. Which is complete BS too but at least I can tell where they are coming from.
The bottom line is that unless you have a too lean main jet. Jet needle adjustment will not effect the main. Sure jets overlap and different combos of jets should be tried if best performance is your goal but . . . .