I recommend going to a Savage clutch bell and bearing like on the MT2 SS. If you are going to run the stock style clutch bell get two 5x8mm and one 5x8mm flanged bearings to replace the stock roller bearing. This is what I did not my MT until I up graded to the Savage clutch bell. The stock CB just wears out to fast for me and then eats up the spur.
Hope this helps.
Savage CB go down to 13 teeth.