Okay, my NRG used to be 70cc .. ive now put a standard engine in, along with standard carb and 53 jet, but it keeps on cutting out .. in the video i'm at full throttle and it bogs/cuts the revs drop.. but once i let the throttle free and slowly build up its fine but seems to hit a barrier and wont go over 30mph.. It has all standard transmission, new spark plug, my old cdi and coil and flywheel off my old engine which i know worked fine and i'm lost at what it could be.. i'm throwing money at it and i need to sell it for money for a 125 at the end of feb .. help please! View My Video