Monkeh, perhaps you need to richen the High Speed Needle (big one coming from the carb.) Then, prime the engine some more.

Or, try opening the servo more.

IF when you're pulling the starter it makes a sound as if it's trying to start, for half a second (EG. *pull**vrooom...**pull**pull**pull*), then you need to richen it, and get more fuel to the carb.

Hope this helps...

And remember, richer setting never hurts as much as Lean would...

-Steve