Topic: Sprocket carrier seal/bearing retainer different threads?

[Garage_guy_chris]

Tonight i got around to working on the rear wheel i was gonna do the bearings and seals, I started working on my polished carrier to destroy the threads and wrecking the part. I grabbed a second one. I took it appart to find about 1/3 of the threads chewed and the outside all chewed up and ruined. So i grabbed what i thought was a later DOHC hub to try my luck and found it had a SOHC sprocket carrier?!?!? upon disassemble i found more damaged threads but not enough to trash the part.. but upon looking closer this last bearing retainer has a much coarser thread. I figured it was just a early vs late part or something.

I checked CMSNL and found all the seal/bearing retainers are the same P/N 41231-283-000 and all have a fine thread. At this point i have no idea what it is the only thing i can think of is its early sandcast or something?

anyone have any ideas about this coarse vs fine threaded retainers?

I have the one coarse thread then the two fine thread retainers?


Here are the carriers outside of condition they all appear the same?!?!

[shinyribs]

Do they all the cush drives have the same amount of offset?

69-76 cushdrives are one thing. But the 77-78 models had the primary sprocket moved outboard 10mm and the cush drive was spaced to match. Maybe that is the difference?

[Garage_guy_chris]

They are all the same with the same offsets, which leads me to believe they are 69-76, the 77-78 don't have the 8 ribs from the stud bosses. the coarse one looks different because someone has painted it along its life

[754]

Do the retainers look factory?
 Common machine shop practice is the machine a bigger OD thread and make a retainer,  if stuck or in a hurry.

[Garage_guy_chris]

I think i have this figured out...  I believe its a CB650 cush drive plate

Here is the 750 retainer P/N 41231-283-000




Here is the 650 retainer P/N 41231-422-000