Jpal101,

When I set up mine, I first set the high speed needle valve to slight rich position, from there, I check the high idle to full throttle transition to make sure it is smooth without either being rich or lean, if not, I will adjust the regulator 1/8 turn at a time, clockwise to lean, and counter-clockwise to richen until the transition is smooth. The idle setting is done by using the idle adjustment valve, which is located right next to the high speed needle valve, but needs flat blade screw driver to turn either clockwise to richen or counter-clockwise to lean, again 1/8 turn at a time. So far, all my YS110 seems to work well with this method.

You can also check the procedure here: [link]http://www.ysperformance.com/[/link] Once you are in, select "Instructions" to see the write up.

Good luck,

Kevin