My jog RR has suffered from this for quite a whole now, when I had my 50cc cylinder on it would build up when I pulled the throttle and then take off, now I've put a 70cc cylinder on and it's even worse it takes ages to build the revs up and then it just shoots off like mad, what is causing this anyone know?
when you fitted the 70cc barrel you moved the powerband up, what you need to do is fit lighter rollers to get the engine revving higher when pulling off, you will need to experiment to get the right weight rollers.
