Hi wildbill,

First thing I would like to say, do not give up, this hobby needs patience, perseverence, persistence, which I'm sure you have. My very short experience which I learned at the field and learned from senior people over here. Check your fuel lines, either it's taking air, check your fuel tank as well as inside line of fuel tank which is attached to the clunk. Also check whether your engine is running too lean, check on ground is must, ofcourse transition as well, do you check your plane by lifting it nose up? nearly 35 degrees, when you lift the nose up how engine reacts? does it tend to get slow, or runs with same rpm then slightly increases, if that so, then engine seems to be ok, and Im sure glow plug is new as well? Try to run pinch test on it too if you can. I hope your problem would be solved, as many experts would give you good advices about your problem, but never back yourself off and give up. There is always a solution and hope. Good Luck

Mody