SOHC.co.uk Forums > CB350/400

Rear disc conversion

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Bryanj:
Does that swing arm have taper roller brgs or does the arm pivot on the bolt? If it pivots on the bolt you need to modify it!
PM me for why

allankelly1:
I would have thought if you are running plain bushes you should never pivot directly on the bolt but there should be a sleeve that is a slide fit in the plain bushes is the width of the frame and the bolt then passes thru this assembly and tighten up using the sleeve to keep the frame width right?

Also this sleeve should be wide enough to allow a slight side float of the arm
In the frame with the bolt fully tight?

Best wishes Al


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allankelly1:

--- Quote from: Oddjob on November 07, 2021, 07:01:35 PM ---Mine is running needle rollers, as should the Dresda arm of yours.

--- End quote ---


Thanks Oddjob for the info

Looking forward to adding this little tweak to the bike even if it needs a tweak

Also offer is still there if I can help you with any 3d project

Best wishes Al


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Bryanj:
Thats the problem Ken and all as if it pivots on the bolt without a collar or spacer to get trapped in the frame you cant do the bolt up tight without restricting swing arm movement and if you leave it loose enough for arm to move the holes in the frame wear.
 Have a box arm that is fitted with bushes that pivot on the bolt, its crap and useless unless i get them bored to fit a standard collar and narrowed enough for the collar to be trapped with clearance for arm.
Thats what the phenolic thrusts in original arms and flanges on brass replacements are for.

allankelly1:

--- Quote from: Bryanj on November 07, 2021, 07:46:37 PM ---Thats the problem Ken and all as if it pivots on the bolt without a collar or spacer to get trapped in the frame you cant do the bolt up tight without restricting swing arm movement and if you leave it loose enough for arm to move the holes in the frame wear.
 Have a box arm that is fitted with bushes that pivot on the bolt, its crap and useless unless i get them bored to fit a standard collar and narrowed enough for the collar to be trapped with clearance for arm.
Thats what the phenolic thrusts in original arms and flanges on brass replacements are for.

--- End quote ---
Sounds like a easy engineering fix

I will see what I receive and then if require modify so the the pivot bolt can be tightened but still maintain some slight side float no matter if it is a taper / needle bearings or a plain push set up

Can’t be any harder than the rear disc conversion


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