Hello I bought myself a KSR GRS 125 where there is a problem with the gearbox According to the previous owner, the service was made shortly before winter with (Zündkerze,Filter,Oil) after that the moped was wintered after the winter break everything was still good but about 1 month ago was according to the statement of one at the other moment the 4.Gang away The moped has 16600km on the clock You can ride the circuit normally goes buttery and without harrowing The 4.Gang behaves like the idle no power transfer ung I just don’t know what it can be it doesn’t crack anything and there are no unusual noises so when you drive you turn 1,2,3, and leave 4th off and switch from 3rd to .5 Maybe someone has an idea what it can be that the 4th course is just gone