JoDyO,

If that doen't help richen up the low speed needle valve 1/4 turn. This is one of those things that you should get some help with. If you are just learning let your instructor handle it for you. Tuning an engine can and usually does get very frustrating for a beginner. If your not a beginner you should know how to set up an engine. Props come off for numerous reasons. The number one cause is that you didn't tighten it enough. Number two is that the engine hydulocked on you. Take out the glow plug and hold the plane upside down. Then without the plug in use your starter and get any excess fuel out of the cylinder. Then start over. By the way what your talking about is called a transition. Thats when you go from idle to full throttle quickly. It should be smooth without any hesitation.

JMHO,

Gibbs