Author Topic: Does anybody know what this washer is for? (Read 2154 times)

jmelche2 · « **on:** September 22, 2025, 12:41:35 PM »

Found it lying next to my bike. CB550

Ozzybud · « **Reply #1 on:** September 22, 2025, 01:41:01 PM »

Quote from: jmelche2 on September 22, 2025, 12:41:35 PM

Found it lying next to my bike. CB550

Battery box mounting, CB750F, CB360T. And I'm sure others

Ozzybud · « **Reply #2 on:** September 22, 2025, 01:46:38 PM »

https://www.cmsnl.com/honda-cb750f-750-super-sport-1976-usa_model490/partslist/

Used on the 550 per page.. not sure where

bryanj · « **Reply #3 on:** September 22, 2025, 03:52:07 PM »

Have you had the head off?

Alan F. · « **Reply #4 on:** September 22, 2025, 04:48:22 PM »

Upper shock mount? Nut missing?

jmelche2 · « **Reply #5 on:** September 23, 2025, 04:16:38 AM »

Quote from: bryanj on September 22, 2025, 03:52:07 PM

Have you had the head off?

Yes - the head is off.

bryanj · « **Reply #6 on:** September 23, 2025, 08:04:43 AM »

Head nut washer

jmelche2 · « **Reply #7 on:** September 23, 2025, 11:56:28 AM »

All head nut washers accounted for. This washer is significantly larger than the head nut washer. This washer measures 20.50mm.
Thanks, Jim

bryanj · « **Reply #8 on:** September 23, 2025, 02:58:43 PM »

How about between generator rotor and bolt head

M 750K6 · « **Reply #9 on:** September 23, 2025, 03:22:20 PM »

Engine mount?

bryanj · « **Reply #10 on:** September 24, 2025, 01:22:10 AM »

Dont remember seing plain washers on mountings

Ozzybud · « **Reply #11 on:** September 24, 2025, 07:21:50 PM »

You can do a reverse search on cmsnl for that size washer. Its used 2 places on the 550 the seat lock assembly. And under the airbox holding I'm not sure what.

jmelche2 · « **Reply #12 on:** September 25, 2025, 03:52:44 AM »

Hmmm? Getting close. I had the airbox out so I will have to start looking there. Thanks,

Ozzybud · « **Reply #13 on:** September 25, 2025, 07:28:46 AM »

If this helps its #89

bryanj · « **Reply #14 on:** September 25, 2025, 08:36:14 AM »

What size hole in the washer? 25mm od is big for a 6mm bolt which is what the airbox one would be

Ozzybud · « **Reply #15 on:** September 25, 2025, 12:33:34 PM »

My washer on my CB550K1 is 20 mm(.80 inch) with a 7mm hole in the middle. Just like the one he pictured.

bryanj · « **Reply #16 on:** September 25, 2025, 01:31:06 PM »

Cant tell what size the od or id is from the pic, we dont have us coins in uk

Ozzybud · « **Reply #17 on:** September 25, 2025, 01:53:31 PM »

He said it was .800 inch

CycleRanger · « **Reply #18 on:** September 25, 2025, 01:58:15 PM »

Man, this mystery washer thread has really got me on the edge of my seat!

bryanj · « **Reply #19 on:** September 25, 2025, 02:30:31 PM »

That gives the od and he seaid 20.5mm, does not corelate to id

jmelche2 · « **Reply #20 on:** September 25, 2025, 02:31:41 PM »

Hold on - went to measure the ID and it measures 8.1mm, rechecked the OD and it measures 23.3mm. Not sure how I came up with 20.5mm.

Now I'm questioning if it is number 76.

Ozzybud · « **Reply #21 on:** September 25, 2025, 03:16:02 PM »

90512-300-000 is a flange washer.

bryanj · « **Reply #22 on:** September 25, 2025, 03:47:15 PM »

8.1 will be for an 8mm bolt/stud

Ozzybud · « **Reply #23 on:** September 29, 2025, 10:39:53 AM »

May have found where your washer came from. Fixing the flat tire on my 550.. the washer on the rear hub brake arm is a match.

seanbarney41 · « **Reply #24 on:** September 29, 2025, 12:37:31 PM »

Quote from: CycleRanger on September 25, 2025, 01:58:15 PM

Man, this mystery washer thread has really got me on the edge of my seat!

No #$%*! If all the oem hardware is not in place serious concourse points could be lost! The humanity...

Jmelche, just ignore us. We are just having fun. You actually deserve big respect for ypur efforts to keep all the hardware correct!

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Author Topic: Does anybody know what this washer is for? (Read 2154 times)