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Author Topic: Does anybody know what this washer is for?  (Read 2788 times)

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Offline jmelche2

  • 1974 CB550
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Does anybody know what this washer is for?
« on: September 22, 2025, 12:41:35 PM »

Found it lying next to my bike.  CB550

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Offline Ozzybud

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Re: Does anybody know what this washer is for?
« 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
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1976 Z50A PARAKEET YELLOW
1970 CT70  CANDY SAPPHIRE BLUE
1971 CT70H CANDY TOPAZ ORANGE
1972 CT70H CANDY EMERALD GREEN
1973 CL200 CANDY RIVIERA BLUE
1974 CB350F GLORY BLUE BLACK METALLIC
1973 CB350F FLAKE MATADOR RED
1975 CB360T LIGHT RUBY RED
1975 CB400F VARNISH BLUE
1975 CB550 FLAKE SUNRISE ORANGE
1976 CB750F CANDY ANTARES RED

Offline Ozzybud

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Re: Does anybody know what this washer is for?
« Reply #2 on: September 22, 2025, 01:46:38 PM »
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1976 Z50A PARAKEET YELLOW
1970 CT70  CANDY SAPPHIRE BLUE
1971 CT70H CANDY TOPAZ ORANGE
1972 CT70H CANDY EMERALD GREEN
1973 CL200 CANDY RIVIERA BLUE
1974 CB350F GLORY BLUE BLACK METALLIC
1973 CB350F FLAKE MATADOR RED
1975 CB360T LIGHT RUBY RED
1975 CB400F VARNISH BLUE
1975 CB550 FLAKE SUNRISE ORANGE
1976 CB750F CANDY ANTARES RED

Offline bryanj

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Re: Does anybody know what this washer is for?
« Reply #3 on: September 22, 2025, 03:52:07 PM »
Have you had the head off?
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Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!

Offline Alan F.

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Re: Does anybody know what this washer is for?
« Reply #4 on: September 22, 2025, 04:48:22 PM »
Upper shock mount? Nut missing?
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Offline jmelche2

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Re: Does anybody know what this washer is for?
« 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.
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Offline bryanj

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Re: Does anybody know what this washer is for?
« Reply #6 on: September 23, 2025, 08:04:43 AM »
Head nut washer
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Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!

Offline jmelche2

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Re: Does anybody know what this washer is for?
« 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
« Last Edit: September 23, 2025, 12:02:01 PM by jmelche2 »
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Offline bryanj

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Re: Does anybody know what this washer is for?
« Reply #8 on: September 23, 2025, 02:58:43 PM »
How about between generator rotor and bolt head
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Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!

Offline M 750K6

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Re: Does anybody know what this washer is for?
« Reply #9 on: September 23, 2025, 03:22:20 PM »
Engine mount?
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Offline bryanj

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Re: Does anybody know what this washer is for?
« Reply #10 on: September 24, 2025, 01:22:10 AM »
Dont remember seing plain washers on mountings
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Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!

Offline Ozzybud

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Re: Does anybody know what this washer is for?
« 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.
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1976 Z50A PARAKEET YELLOW
1970 CT70  CANDY SAPPHIRE BLUE
1971 CT70H CANDY TOPAZ ORANGE
1972 CT70H CANDY EMERALD GREEN
1973 CL200 CANDY RIVIERA BLUE
1974 CB350F GLORY BLUE BLACK METALLIC
1973 CB350F FLAKE MATADOR RED
1975 CB360T LIGHT RUBY RED
1975 CB400F VARNISH BLUE
1975 CB550 FLAKE SUNRISE ORANGE
1976 CB750F CANDY ANTARES RED

Offline jmelche2

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Re: Does anybody know what this washer is for?
« 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,
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Offline Ozzybud

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Re: Does anybody know what this washer is for?
« Reply #13 on: September 25, 2025, 07:28:46 AM »
If this helps its #89
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1976 Z50A PARAKEET YELLOW
1970 CT70  CANDY SAPPHIRE BLUE
1971 CT70H CANDY TOPAZ ORANGE
1972 CT70H CANDY EMERALD GREEN
1973 CL200 CANDY RIVIERA BLUE
1974 CB350F GLORY BLUE BLACK METALLIC
1973 CB350F FLAKE MATADOR RED
1975 CB360T LIGHT RUBY RED
1975 CB400F VARNISH BLUE
1975 CB550 FLAKE SUNRISE ORANGE
1976 CB750F CANDY ANTARES RED

Offline bryanj

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Re: Does anybody know what this washer is for?
« 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
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Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!

Offline Ozzybud

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Re: Does anybody know what this washer is for?
« 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.
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1976 Z50A PARAKEET YELLOW
1970 CT70  CANDY SAPPHIRE BLUE
1971 CT70H CANDY TOPAZ ORANGE
1972 CT70H CANDY EMERALD GREEN
1973 CL200 CANDY RIVIERA BLUE
1974 CB350F GLORY BLUE BLACK METALLIC
1973 CB350F FLAKE MATADOR RED
1975 CB360T LIGHT RUBY RED
1975 CB400F VARNISH BLUE
1975 CB550 FLAKE SUNRISE ORANGE
1976 CB750F CANDY ANTARES RED

Offline bryanj

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Re: Does anybody know what this washer is for?
« 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
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Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!

Offline Ozzybud

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Re: Does anybody know what this washer is for?
« Reply #17 on: September 25, 2025, 01:53:31 PM »
He said it was .800 inch
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1976 Z50A PARAKEET YELLOW
1970 CT70  CANDY SAPPHIRE BLUE
1971 CT70H CANDY TOPAZ ORANGE
1972 CT70H CANDY EMERALD GREEN
1973 CL200 CANDY RIVIERA BLUE
1974 CB350F GLORY BLUE BLACK METALLIC
1973 CB350F FLAKE MATADOR RED
1975 CB360T LIGHT RUBY RED
1975 CB400F VARNISH BLUE
1975 CB550 FLAKE SUNRISE ORANGE
1976 CB750F CANDY ANTARES RED

Offline CycleRanger

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Re: Does anybody know what this washer is for?
« 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!  ;D
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Offline bryanj

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Re: Does anybody know what this washer is for?
« Reply #19 on: September 25, 2025, 02:30:31 PM »
That gives the od and he seaid 20.5mm, does not corelate to id
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Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!

Offline jmelche2

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Re: Does anybody know what this washer is for?
« 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.
« Last Edit: September 25, 2025, 02:50:15 PM by jmelche2 »
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Offline Ozzybud

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Re: Does anybody know what this washer is for?
« Reply #21 on: September 25, 2025, 03:16:02 PM »
90512-300-000 is a flange washer.
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1976 Z50A PARAKEET YELLOW
1970 CT70  CANDY SAPPHIRE BLUE
1971 CT70H CANDY TOPAZ ORANGE
1972 CT70H CANDY EMERALD GREEN
1973 CL200 CANDY RIVIERA BLUE
1974 CB350F GLORY BLUE BLACK METALLIC
1973 CB350F FLAKE MATADOR RED
1975 CB360T LIGHT RUBY RED
1975 CB400F VARNISH BLUE
1975 CB550 FLAKE SUNRISE ORANGE
1976 CB750F CANDY ANTARES RED

Offline bryanj

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Re: Does anybody know what this washer is for?
« Reply #22 on: September 25, 2025, 03:47:15 PM »
8.1 will be for an 8mm bolt/stud
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Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!

Offline Ozzybud

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Re: Does anybody know what this washer is for?
« 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. 
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1976 Z50A PARAKEET YELLOW
1970 CT70  CANDY SAPPHIRE BLUE
1971 CT70H CANDY TOPAZ ORANGE
1972 CT70H CANDY EMERALD GREEN
1973 CL200 CANDY RIVIERA BLUE
1974 CB350F GLORY BLUE BLACK METALLIC
1973 CB350F FLAKE MATADOR RED
1975 CB360T LIGHT RUBY RED
1975 CB400F VARNISH BLUE
1975 CB550 FLAKE SUNRISE ORANGE
1976 CB750F CANDY ANTARES RED

Offline seanbarney41

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Re: Does anybody know what this washer is for?
« 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!  ;D
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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If it works good, it looks good...

Offline Ozzybud

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Re: Does anybody know what this washer is for?
« Reply #25 on: September 29, 2025, 06:48:24 PM »
Quote from: seanbarney41 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!  ;D
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!

LOL..  I think he was more concerned with something not being attatched on his next trip around the block.
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1976 Z50A PARAKEET YELLOW
1970 CT70  CANDY SAPPHIRE BLUE
1971 CT70H CANDY TOPAZ ORANGE
1972 CT70H CANDY EMERALD GREEN
1973 CL200 CANDY RIVIERA BLUE
1974 CB350F GLORY BLUE BLACK METALLIC
1973 CB350F FLAKE MATADOR RED
1975 CB360T LIGHT RUBY RED
1975 CB400F VARNISH BLUE
1975 CB550 FLAKE SUNRISE ORANGE
1976 CB750F CANDY ANTARES RED
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