dinu...

Hi, Around 1 month back i have got my RX135 1999 model 4 speed. And i am finding some problems in that. The previous owner have't maintained the bike properly. the gear shifting is too difficult as it is tight. how can i make it smooth. He has changed some alteratins in the silenso and nw the sound it too high and not good. i wanted to make it original sound . and now the 2T oil is adding with petrol in the tank . Is there any problems on this?