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.

Honda CB750F 1981 (B) EUROPEAN DIRECT SALES PRIMARY SHAFT - buy PRIMARY SHAFT spares online

✓access the PRIMARY SHAFT schematic✓find Honda PRIMARY SHAFT spares easily✓PRIMARY SHAFT parts quickly delivered

www.cmsnl.com

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.

Honda CB750F 1981 (B) EUROPEAN DIRECT SALES PRIMARY SHAFT - buy PRIMARY SHAFT spares online

✓access the PRIMARY SHAFT schematic✓find Honda PRIMARY SHAFT spares easily✓PRIMARY SHAFT parts quickly delivered

www.cmsnl.com

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!