Excuse my English, if you have any problems with this engine look here.
http://it.youtube.com/watch?v=HQeAnmcvRfA

G'day Mate,
That's fine, but what happens when you try to fly it at 1/2 throttle?
It's usually the midrange, that's the problem.

I watched the video. Nicely set up engine. How would this video be helpful if someone were having problems? A rhetorical question, but I had to ask.

Super Tigre engines are really simple.......Make sure the spray bar is facing the right direction (straight down) adjust the mixtures and go fly.