ORIGINAL: chubbysuncle

Oh Stop! Heres's a simpler version. The needle under the High speed needle is a midrange needle. When you're accelerating from an idle the low speed needle needs to be rich enough to provide the fuel necessary to get the motor pulling and gaining RPM's until the high speed needle can take over and continue the acceleration. Kinda like a relay race. The guy fast off the line but only a short distance is first then the guy that can run super fast but sucks off the line is second. With a midrange needle you've kinda got a guy that can do both but kinda sucks at both. If you know what you're doing you can use the midrange needle to make the switch between LSN and HSN perfect. IN THEORY![:-].