Last night i tried to run the engine again. It behaved like a spoiled child and did nothing i asked When it ran above idle speed the ecu had a hard time keeping the rpm's straight an it flamed out everytime. It did run nicely steady at 40K one time but then it shutted down directly, low speed error..... With or without cone made no difference. I could not see any rubbing but the noise was there every run. I took the engine apart and found that the glow plug ring had come loose. I did not like the way it was soldered but i had no hardsolder experience....... but that is not that difficult Tonight i cleaned the cc and ring and tried so solder them with silver solder and flux. GREAT! Better then i hoped Tomorrow i will run it again and see what happens