Well I started our race season with one... and I FINALLY found the SCHWEET spot for the carb... the engine has a load of bottom end, but I found that if you ise with a Paris Ring pipe the engine lacks top end... I am now using an RDLogics pipe and that helped quite a bit.
Run time is awesome... just toying around I got over 10minutes to the tank... (I have a bit more fuel lin than the average joe)
You do have to be VERY deliberate with the carb settings, my engine likes to be a hair over lean on the bottom, and the top I'm approx 4 turns out, anything other than that the motor runs like a cow. I am also running 30% nitro, so I ahd to also add another .3mm head shim & run a cold plug (MC9)..... My friends engine likes to run the factory settings on the carb and standard plug
So as you can see be sure to take your time with it, you wont be disappointed!