Are you talking about a straight gas /oil mix? I do not have any numbers for that. The only time that I used a straight gas/oil mix was for the initial break in period which was all of 1/2 hour. I ran it rich and with the glow driver attached. It probably was running about 6700 RPM if I remember. Also, the Zama carb that is stock in the unit does have low and high needles. I had to cut slots on the needle heads so that I could use a screw driver for adjustments.A screwdriveris probably the best way to adjust the needles because you will need to make several minute adjustments.