Now that I have had a chance to fly it and brake it in, it is a great engine. I am getting 9100 rpm with a 18x6 zinger prop, 20/20 fuel with a pitts smoke muffler. I have about 2 gallons of fuel through her and she has converted my cap into a total 3d machine. I the ys 120f was fun but the ys 140L is a totally different beast.

Hope this works for you,

Thanks,
Chris