I recently bought a 4g trans, and installed it, I noticed quite a bit of vibration, took it off tore it down and found that the clutch drum was 22 thousands out of round ,. I put it on the lathe and removed the 22 thousanths and now it runs as smooth as a baby's bottom so my suggestion is to check the runnout of all rotary parts you get , iot will save ware and tare on you bike
clfxwill