Topic: swingarm shock bushings

[WHALEMAN]

I plan to have my K2 swingarm powdercoated while it is off. Does anyone know if I have to press out the bottom shock mount bushings as they have hard rubber in them. I tried to quickly get them out but after 30+ years they are tight. They are still avaiable. If the heat will hurt them I would rather get them out now as I don't want to be trying to beat them out of a new powdercoated swingarm.

[supersport_CB400F]

I left mine in and blanked them off with washers, fixed with a bolt they seem fine.

[seaweb11]

With one frame I left them in, they taped them and all was well. On another one, at a different coaters they "cooked" the frame in an oven 1st to get all the oils off before sandblasting and part of  them fell out. What was left in had to be pressed out at a machine shop

[pae]

Any one know what diameter the outer ring of the bushing is? (I assume thay are rubber rings with a metal inner and outer sleeve bonded on)

I'd like to press mine out before powdercoating, but it looks like they are well rusted in, and have a PO's cruddy paint job over them too, so it's not east to tell what size rod to press them out with.

regards, Phil

[supersport_CB400F]

Any one know what diameter the outer ring of the bushing is? (I assume thay are rubber rings with a metal inner and outer sleeve bonded on)

I'd like to press mine out before powdercoating, but it looks like they are well rusted in, and have a PO's cruddy paint job over them too, so it's not east to tell what size rod to press them out with.

regards, Phil

They’re probably different sizes for different bikes; I ended up replacing mine with phos bronze bushings.

[spitfire]

I have just had the swingarm on my 1976 CB750F1 powder coated, I checked with the firm and they advised me to remove them due to the temperatures used in the process. I cleaned all the paint from the area, put the swingarm in a vise and using a socket drifted them out, it was not easy. I found a socket that matched the OD of the bush, inserted a bolt through the socket to act as a guide and using my biggest hammer bashed them out. Once removed the bushes cleaned up well, but I have bought a new pair, am not looking forward to fitting them to my newly coated swingarm.

Cheers

Den

[supersport_CB400F]

I have just had the swingarm on my 1976 CB750F1 powder coated, I checked with the firm and they advised me to remove them due to the temperatures used in the process. I cleaned all the paint from the area, put the swingarm in a vise and using a socket drifted them out, it was not easy. I found a socket that matched the OD of the bush, inserted a bolt through the socket to act as a guide and using my biggest hammer bashed them out. Once removed the bushes cleaned up well, but I have bought a new pair, am not looking forward to fitting them to my newly coated swingarm.

Cheers

Den

I used a sash clamp and lots of grease to fit the new ones, no damage to paint and it wasn't as bad a job as as getting the old ones out!





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[spitfire]

Thanks biffta, sounds like a painless way of doing it.

Cheers

Den

[Bodi]

The pictured bushings are for the swingarm pivot, the shock rubber cushioned bushings can be a real bugger to get out. I used a socket just a hair smaller (outer diameter) than the bushing and found a piece of pipe just larger. Sandwiched in a vise so the bushing would be forced into the larger pipe it took a LOT of pressure to break free then came out fairly easily. The new ones went in pretty easy after lightly sanding the hole smooth to get the rust off, heating the swingarm leg a bit, and cooling the bushing in the freezer. A bit of anti-seize as lube and it pressed in easily with the same vise.
The rubber is probably hard as a rock now, new ones are a good plan. Make sure you mask the hole so it doesn't get powder coated!

[pae]

Thanks guys. I'd planned to use a socket just about the same size as the outer sleeve to push with and a larger socket to support the other side, similar to Bodi. Centring the socket on a bolt sounds neat - hadn't thought of that, thanks 

I measured mine at ~7/8" OD

regards, Phil