i have honda 125 model 2010...there are 2 issues in my bike..i bought it second hand and had to go for changing piston rings and valves as it was giving smoke...but the ride was very very smooth...but after head opening there is a little vibration in my bike as i go at 70-80km/h...whihc wasnt before the head was opened..mechanic is saying once 2/3 tunings r done then it wud go away..meanwhile he tightened the tapits after 500kms...second issue is that on speed over 60km/h the bike handle is shaking like anything...pehley nahi tha i dont know what has happened to it..i changed the tyre rings as well yesterday still the shaking is there..what can be the problem??ill be glad if someone can help me with it..regards