Good evening dear community, I have a problem with my 4stroker. Model is AGM GMX 450 one. It started with that when I drove and it went up a mountain (before about 10km without problems ) my scooter from normal 45 km/h to suddenly 30 km/h and continued to fall. The engine gave a stuttering of itself as if he wanted to turn up, but it could not. At home was the first guess of the carburettor. Since I had a new one I just changed it. A Chja, when he had the power loss on the mountain he did not go on any more. With the new carburetor he still did not go on. After eternal search for rum ( even checked the control chain ) and change the spark plug I finally found the error. My spark plug was broken, the spark plug had ignition errors. With a new ignition coil he goes on now I already thought everything palletti . My problem that I have now is: When I give in the stand gas everything goes normal up to about 1/3 I tried to adjust the mixture by carburetor needle, but no matter which notch I put the plate my scooter smokes blue, so too fat. I don’t know anymore. I suspect that the gammlige choke is broken but I don’t have a plan anymore, I hope you can help me. Mfg