With the extra weight of the chain , sprocket and clutch the bike is heavier on that side.
Here is a little experiment to try ---
#1 take the cushions off of your couch and place them on either side of the bike
#2 place a level acrossed the frame tubes
#3 Let go of the bike , Which way did it fall ?
This is the heavy side and the tire will wear quicker on this side.
To remidy this problem you need to do one of two options.
#1 drill holes in the frame or engine plate on the heavy side to lighten it or
#2 pack the frame rails on the light side with sand, concrete or lead.
I have been doing this for years and my tires wear out dead even.
It makes wheelies effortless and staight as an arrow.
Rob
Please let me know how you make out