I'm trying to find out what is the best oil for my bike, and also makes the bike shift smoother?

I usually run a 20w-50 motorcycle specific oil. But have never had a problem with auto oils either (as long as it doesn't have the "energy conseration" label).

The shifting on these bikes will always be a bit notchey, it's just their nature.

I use 20W 40 Yamalube.. No problems yet.. :D