After removing the primary chain case, exactly how much disassembly is required to replace the mainshaft bearing large seal, quad seal and the small 5th gear countershaft seal? Looks like I need to remove the transmission sprocket for sure, but what about the mainshaft and countershaft assemblies, main drive gear and bearing, shifter arm assembly, etc? What special tools are required? I have the service manual, but it doesn't cover seal only replacement

 

Yuo need to remove the outer primary, comp assy and clutch basket, inner primary, and belt sprocket.Main drive geard and bearing stays put. While you are in there change all the seals like inner primary o ring, jackshaft seal, inner primary bearing seal, primary cover gasket, shifter shaft seal, quad seal..etc....Special tools, just a tq wrench and a sproket nut removal tool from geroges garage.