Any one know what this is?

[Azdevil09]

Rebuilding my first engine. 81 cb750k. during the disassembly this little guy "fell" out when I had the oil pan off and was disassembling the lwr case. Not sure what it is nor where it came from.

 

[ScottishBadger]

Primary Gear Collar, part number 23105-425-003, item number 5 on the CMSNL page link.
https://www.cmsnl.com/honda-cb750f-1981-b-european-direct-sales_model14867/partslist/E15.html
Only way it can "fall out" is if it slipped out when someone was inserting the Primary Shaft, or if you removed the shaft first and didn't catch it maybe?

 

[Azdevil09]

Primary Gear Collar, part number 23105-425-003, item number 5 on the CMSNL page link.
https://www.cmsnl.com/honda-cb750f-1981-b-european-direct-sales_model14867/partslist/E15.html
Only way it can "fall out" is if it slipped out when someone was inserting the Primary Shaft, or if you removed the shaft first and didn't catch it maybe?

Sorry for the LONG delay. New job and it’s been a grind.

Thank you very much. You are spot on. I believe I removed the lrg primary gear when tearing down and must not have seen that collar on there when I did. (First tear down). Nonetheless, thank you VERY much for calling that out. Life saver!

 

[Azdevil09]

Primary Gear Collar, part number 23105-425-003, item number 5 on the CMSNL page link.
https://www.cmsnl.com/honda-cb750f-1981-b-european-direct-sales_model14867/partslist/E15.html
Only way it can "fall out" is if it slipped out when someone was inserting the Primary Shaft, or if you removed the shaft first and didn't catch it maybe?

Hey ScottishB, round two for you. Any ideas what this is?

 

[ScottishBadger]

Hey ScottishB, round two for you. Any ideas what this is?

Same page, item 26, thrust washer?

 

[Azdevil09]

Same page, item 26, thrust washer?

Man I don’t ever remember taking off that main bearing behind the splined washer. But I’m ping to open the awe and double check as it certainly makes sense since I added that splined washer.

 

[Azdevil09]

I

Same page, item 26, thrust washer?

i don’t think that’s it.
1) I can’t get the bearing off to access (haven’t tried that hard but I would have remembered removing).
2) I believe I see it in the below pic.

 

[Azdevil09]

I

i don’t think that’s it.
1) I can’t get the bearing off to access (haven’t tried that hard but I would have remembered removing).
2) I believe I see it in the below pic.

Confirmed. Although they are identical!! Right is from primary shaft. Left is mystery part in question.

 

[Azdevil09]

Thought I’d give this a bump. This little bugger is keeping me from reassembly.

 

[Azdevil09]

Whelp. I was operating under the assumption is was the washer behind the clutch housing as others had mentioned on another forum. Ended up putting the the motor back together only to find out it was not the correct diameter. So got the motor fully assembled and left with that “thrust washer”………… I’m sure it will all be fine…..

 

[brettp]

I feel for ya. I have no idea what that is for, I would have helped if I could.

 

[Azdevil09]

Lots of first time learnings happening that’s for sure!!