Hi,
I'm trying to break in a new engine and am having loads of problems. I had starting problems, now I've managed to get 3 tanks through it, but it starts revving uncontrollably. It revs high when I close the carb (?? yeh really !! ??), and slows a bit when I open it. I'm noticing fuel on the chassis beside the engine. Do you think I have an air leak ? Where could it be from ?

Any ideas would be really appreciated.

Regards,
32819toon