The following happened to me…. We were on the way with two scooters, Sunday towards the ice cafe…. On the way back on a slight slope the retro scooter suddenly went out and didn’t want to start again. After countless attempts at some point the retro jumped again and ran really well. Well, it was nothing to see so further in the normal “ticket plan”. On Thursday morning he rang something But brought his performance……. Friday morning he quit on the way to work I took the patient home by trailer and researched the cause……Motor turned, No noticeable noise …. Until then the compression measurement made serious assumptions. … .3bar…. So disassembled…and … control chain dropped. After visual inspection of all components again built together……he has over 9 bar…. But doesn’t sound good, rather the opposite. So used 139qmb Agregat worried. and this will be installed on the WE, then it should run again. But now a question….. In the scooter papers there is among other things the installed engine, in this case 139qmb No xxx Should man have the papers carefully corrected at the TÜV or no matter? 139qmb is 139qmb What do you think?