Well it finaly got into the 50's yesterday, and I broke in the .75. I ran four 14 oz tanks of omega 10% w/2 oz of caster added through it on a APC 12-6. Then I started to prop it. I first ran it up with a 12-7Apc and it peaked at 12,100and I packed it off to 11,800. Then I ran it up with a APC 13-6 and it peaked at 12,000 so i backed it off 11,700. The engine idles fantastic wiht a OS #8 and bison pitts muffler. The transition might be a just a little on the rich side, absoulutly no flame outs while running it.