Good day. I bought a Sym Jet 50 R 2 timer since Nov 2014. I did the 500 he inspection and always ran very well. Last week I drove down the mountain he ran 60-63 kmh loud tacho.(According to tacho straight track also 60 kmh) When the mountain went up he also ran 45-50 kmh and got slow on the straight at once. And slowly but also slowly went back to the 50 stopped again to 50 went up again. Since that he needed forever until he speeded up. So until he comes at 50 kmh. And he sounds dull from the sound. Ok I made to the dealer directly the 2nd inspection and explained the problem. That he no longer has the power as at the beginning. According to dealer the scooter has nothing. Carburettor cleaned, vario rolls changed, ignition candle air filter etc. The piston would be ok. But the scooter simply has no more power. As if the 1-2 Ps has less. So it is cruel when cars are behind me and I need totally long until he drives 50 kmh. I notice e simply that he has at least 30% less power.