Iv been giving my bike a good hard run today there was no holding back I pushed as hard as it can go. Firstly I dont think this bike can hit 100kmph with a 76kg rider on it. In fourth gear at full trottle it reaches max speed then goes ok for a while and then it kind of cant hold on and almost dies out, Theres also some backfiring happening. I always ease off as soon as it dies out, if I dont it conks and makes a noise like its a piece of crap then kind of picks up but im not going to push my luck and hurt the poor thing. Does or has this happen with you guys, I was thinking that it may have something to do with not being run in well in fourth.