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Just got done running two tanks thru the Jett. . . all I can say is WOW.  I started with an 11 x 7 and without touching anything got 15.5K on the first tank.  I switched to a 12 x 6 and got between 14.5K and 15K.  I'm sure the neighbors are lovin' me!!! . . .
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All of this without going thru the whole tuning instructions and the pipe sliding back and forth whenever I changed RPM.
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Obviously Dub is right about running this engine on a test stand before putting it in an airplane.  Much easier to notice and fix issues on the stand. . . like the sliding pipe and header bolts loosening . . . I can also tell that I'll need to seal the engine compartment will since the carb likes to spit fuel.  Got a little work to do on the transition between now and then. . .
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After only two tanks I can tell that it is loosening up nicely.  Can't wait to hear this engine in the air!!!<br type="_moz"/>