Hi Guys Just recently bought an CFmoto leader 150cc bike as an learner bike and have only clocked about 260k's on it at 200k's it started making their weird knocking sound so i took it to local cfmoto dealer and they said its sounds like a big problem. possibly crankshaft/piston and they spoke with CFmoto/mojomotorcycles who advised them i should take it back to the place of purchase. Had it checked out at the shop where i got it from and they advised me its an "normal engine characteristic" which i'm having a hard time believing apparently the tapids(sp?)/exhaust combined make this noise and I shouldn't worry about it. I'm going to chase up cfmoto and get an 3rd mechanic to check it out it, I'm hoping by attaching a youtube vid I could get some feedback sorry for the crappy quality only had the ipad to record with. also the bike is 2 weeks old today. update 1: even after fist service problem persists update 2: 29/08 just got an update from racecourse motors cam shaft and rocker arm(s?) damaged valves were overtightened parts not in stock looking at a 2-3 week wait from china.