Originally Posted by marksbonneville
I have a question regarding a shim (spacer) located behind the front primary sprocket up against the main bearing. My factory parts manual does not show one, my Haynes manual list it as an oil seal, and I honestly do not remember whether or not I removed this shim during disassembly but I "think" one was there. Any help would be appreciated.
Get a proper factory workshop manual here: http://www.classicbike.biz/Triumph/Repair/Repair.htm
It should explain the purpose of the shim, and how to calculate it