Ok so i have been having many issues with this motor. At the point were i just put on new stock carb. Needle set at 2nd notch from top. Only 4 notches by the way. Bike will start and run only when at high speed (down hill) then only stay running when i hold throttle all the way down. If i let off throttle bike dies. Where should i set needle and why is this happening. Just took off better carb. Had it running with that one and had idle but now power at all? Any help is great.