Author Topic: Rear swing arm - interesting pivot bushes - plastic?  (Read 661 times)

Offline McCabe-Thiele (Ted)

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Rear swing arm - interesting pivot bushes - plastic?
« on: July 24, 2021, 05:14:46 PM »
Just started looking at my rear swing arm/forks - the bearings appear to be some sort of plastic or nylon arrangement. Is this right & do I need to replace or convert to a brass arrangement if what I have found on the internet is right? Tried to search here but could not find a post on the subject though I guess it must have come up in the past.
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Offline 4wDaz

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Re: Rear swing arm - interesting pivot bushes - plastic?
« Reply #1 on: July 24, 2021, 05:25:55 PM »
I replaced mine with the set that nurse Julie sells, good quality and well worth the money

Offline Bryanj

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Re: Rear swing arm - interesting pivot bushes - plastic?
« Reply #2 on: July 24, 2021, 05:29:37 PM »
Original are a type of plastic and use a seperate "top hat" thrust washer. You can happily replace with brass ones.

BE CAREFULL the collar wears more than the bushes and costs a lot, last i saw were over £80

Offline Nurse Julie

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Re: Rear swing arm - interesting pivot bushes - plastic?
« Reply #3 on: July 24, 2021, 05:29:56 PM »
The very hard plastic ones are the originals Ted. If you are going to remove them, replace with the bronze Bushes. Report back here for tips on how to remove the old ones 😊
Im a Nurse, trust me, this won't hurt.....much !!!

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Offline McCabe-Thiele (Ted)

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Re: Rear swing arm - interesting pivot bushes - plastic?
« Reply #4 on: July 24, 2021, 05:59:05 PM »
The old ones pulled out with my fingers!
Do you sell a better option PM me when you can if you do.
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Offline McCabe-Thiele (Ted)

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Re: Rear swing arm - interesting pivot bushes - plastic?
« Reply #5 on: July 24, 2021, 06:06:15 PM »
Original are a type of plastic and use a seperate "top hat" thrust washer. You can happily replace with brass ones.

BE CAREFULL the collar wears more than the bushes and costs a lot, last i saw were over £80
Not sure what you mean by a top hat washer - mine just had a sort of oil seal at each end?
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Offline Bryanj

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Re: Rear swing arm - interesting pivot bushes - plastic?
« Reply #6 on: July 24, 2021, 06:33:15 PM »
The bush ought to be a tight fit in the swingarm, then a felt sealing washer, then a shaped phenolic piece where one bit goes into the swingarm with a bigger diameter that acts as a side thrust for the swingarm then a shaped steel cup washer. If the bushes pulled out easy they were either the wrong ones or badly fitted by a po, normally you have to destry them to get them out

Offline Nurse Julie

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Re: Rear swing arm - interesting pivot bushes - plastic?
« Reply #7 on: July 24, 2021, 06:57:44 PM »
The old ones pulled out with my fingers!
Do you sell a better option PM me when you can if you do.
These are the ones I sell and what we fit to all our own bikes Ted. I will PM you later or tomorrow.

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Offline McCabe-Thiele (Ted)

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Re: Rear swing arm - interesting pivot bushes - plastic?
« Reply #8 on: July 25, 2021, 12:44:52 AM »
The bush ought to be a tight fit in the swingarm, then a felt sealing washer, then a shaped phenolic piece where one bit goes into the swingarm with a bigger diameter that acts as a side thrust for the swingarm then a shaped steel cup washer. If the bushes pulled out easy they were either the wrong ones or badly fitted by a po, normally you have to destry them to get them out

When I looked at my swing arm I said to myself - oh no Ted not another end float problem.
The rear swing arm has definitely been out before by a PO as it all came apart far too easily & the grease nipple was too big & had snapped off - I managed to get the broken part out okay.

The parts manual just shows the bushes & an oil seal on each side - no cup washers etc. Hopefully NJ's Brass bushes might fix things up my seals looked in fair shape - tbh I would have preferred some decent copper spacers or thrust washers on either side arrangement. To be continued..................................
« Last Edit: July 25, 2021, 04:36:54 PM by Macabethiele (Ted) »
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Offline Bryanj

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Re: Rear swing arm - interesting pivot bushes - plastic?
« Reply #9 on: July 25, 2021, 08:44:06 AM »
The flange part of the brass bush acts as the side thrust face for the swing arm.
I was quoting the assembly for the 500/550/750 and having had time to look at cmsnl the 400 pic is different with the thrust part of the bush, still should be a very tight fit in the arm though.
Freeze the bushes before fitting

Offline AndyD

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Re: Rear swing arm - interesting pivot bushes - plastic?
« Reply #10 on: July 25, 2021, 03:48:04 PM »
Good timing - just stripping down the swing arm on the CJ360 which has the same bushes and the old plastic bu**ers don't want to come out easily!
Is there a technique to removing them - no worries about damaging them as they'll be replaced but don't want to damage the swingarm itself.
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Offline Bryanj

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Re: Rear swing arm - interesting pivot bushes - plastic?
« Reply #11 on: July 25, 2021, 05:25:43 PM »
Hacksaw blade through the hole but you will probably have to cut twice at 180 degrees, wish i could weld steel like those plastic bushes get in the metal arm!

Offline Oddjob

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Re: Rear swing arm - interesting pivot bushes - plastic?
« Reply #12 on: July 25, 2021, 05:58:44 PM »
One cut is usually enough Bryan so long as it cuts right through the wall of the bush, you can see the bush collapse when you do it right and it will knock out very easily when it has.
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Offline Sesman

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Re: Rear swing arm - interesting pivot bushes - plastic?
« Reply #13 on: July 25, 2021, 06:24:38 PM »
Seconded. I followed Oddjob/Bryanj advice and they basically pushed out. Iv’e used the brass bushes supplied by NJ and the end result is perfect. I got lucky though, the spindle was in perfect condition.
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Offline Kelly E

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Re: Rear swing arm - interesting pivot bushes - plastic?
« Reply #14 on: July 26, 2021, 04:19:44 PM »
To remove swingarm bushings I take 3 washers that fit in the swingarm. I grind a flat on opposite sides of the washers so they will fit through the bushings. Drop them into the swingarm so they are laying on the inner edge of the bushing below. Then I use a metal rod to hammer out the bushing by pounding on the washers. Once you have the washers made it only takes a few hammer hits to drive out the bushings. It is way easier than cutting with a hacksaw blade.
You need three washers so they don't bend while you're beating on them.
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