Cd70 sprockets

[pwuser158913575038]

Hello fellows. Hope you are all in the best of health.
Guys my bike is cd70 dream. I ride it normally at 50-60kph. Problem is that it has vibration. I want to get rid of that. Tuning is done all bolts are tight. I have heard that increasing front sprocket from 15/16 will help. I have also heard that it weakens the engine. I dont want pickup as i dont race. What should i do?
Enlighten me.

[Hassan1991]

You go big in front you loss pickup
You go big in rear you loss speed
Drive and driven relation.
I used different sizes but at the end Stock is best.
Still you can use 15 in front if you really don't care about pickup.

[pwuser158913575038]

Thanks brother