If you have yours apart Mitzy on a street bike. I would do just the drive side of all the gear dogs, unless you have a real high power engine and flog it. Shimming the gearbox correctly is the big one for me, not that I have done hundreds of R3's , but every box I have looked at has been pretty loose. This is not a rocket specific problem, there are plenty of bikes with fairly ordinary assembly. I have had two brand new 2016 R1 Yams with gearbox failure so far. Just with a pipe and a tune, not hotrods.