Author Topic: '71 CB500 Top Fork Bridge  (Read 1090 times)

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Offline blip

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'71 CB500 Top Fork Bridge
« on: December 19, 2014, 03:46:51 PM »
I started to tear down the bike today and noticed that the top fork bridge is cracked near the clamp on the left side. Can someone please list the years and models that are interchangeable? I should probably get one now rather than later. Thanks.

Offline MoMo

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Re: '71 CB500 Top Fork Bridge
« Reply #1 on: December 19, 2014, 03:51:06 PM »
Easy way to check is to find the part number(motogrid.com ) is a good site then put the number into their search engine and it will list all compatible models.  I've a friend who has his son repair broken top crowns...Larry

Offline blip

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Re: '71 CB500 Top Fork Bridge
« Reply #2 on: December 19, 2014, 07:22:51 PM »
Thanks but that page doesn't list interchangeable parts. From what I can find the 71-76 CB500/550 may work. can anyone confirm this before I purchase one and find out it won't work? also are there any billet ones available with the clamps for stock bars or anything other then clip ons?

Offline calj737

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Re: '71 CB500 Top Fork Bridge
« Reply #3 on: December 19, 2014, 09:09:59 PM »
They are interchangeable, and billets are available. I have a stocker if you need one. Let me know.
'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline blip

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Re: '71 CB500 Top Fork Bridge
« Reply #4 on: December 19, 2014, 09:27:25 PM »
Thanks calj737. I do need one. What are you asking for your stock one? I am located in saskatchewan Canada, are you willing to ship to Canada? (I will pay the shipping cost.)

Offline calj737

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Re: '71 CB500 Top Fork Bridge
« Reply #5 on: December 19, 2014, 09:52:38 PM »
PM sent.
'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline SohRon

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Re: '71 CB500 Top Fork Bridge
« Reply #6 on: December 20, 2014, 09:51:30 AM »
The most likely reason for a cracked yoke clamp is that the spacer washers (the little "D" shaped washers in the following pic) were either left out or were too thin.




If you can't find an actual part, they can be reproduced by using a washer of the correct diameter and @ .090 thickness, then grinding the flat on one edge. The flat is important because it allows the washer to fit up against the forks

« Last Edit: December 20, 2014, 09:57:53 AM by SohRon »
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Assembling my '74 CB550: http://forums.sohc4.net/index.php?topic=86697.0
Assembly of the Right-hand Switch (a rebuilder's guide):  http://forums.sohc4.net/index.php?topic=80532.0
Installing stock 4X4 exhaust: CB500-CB550 K: http://forums.sohc4.net/index.php?topic=82323.0
CB550 Assembly Manual: http://forums.sohc4.net/index.php/topic,151576.0.html

Offline blip

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Re: '71 CB500 Top Fork Bridge
« Reply #7 on: December 20, 2014, 10:06:58 AM »
After noticing the crack and doing some research that was the cause. continuing to disassemble the bike the washer was still in the other side that is not cracked.