Hi everyone I need some help with my boys 50. I have seen this thread on here before but never saw any final complete answers. It idles fine and revs up but as soon as there is a load on it the bike struggles to move. I thought is was a clutch issue so I got a new one put in but no success. I am pretty stumped as where to go from here. I got a new top end kit to put in just want to know if this should be my next step. Thanks for the help!!