Hey guys my engine F4 2013 is broken, the internal chain from the engine has burst causing this many internal damage (bent valves etc) I am very upset and disappointed with this bike to change the brand, as it only has 6200 kms and have a very smooth ride, seems to be a manufacturing problem as another user from another city f4 2013 also happened ...... I'm hoping the same factory as can solve, now they are on vacation. ......... some of you know if this happened to another user ???