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A65 swingarm silentblocks #780307 08/01/19 10:24 pm
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Adam M. Online Content OP
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Whats your guys opinion about those silentblocks or rather riding with them.
My 67 swingarm has them and they look OK - couldn't find any clearance with my swingarm when it was still in frame.
However this is old rusty frame I could remove a swingarm without any problems and a long spindle holding it together was oiled and completely without rust ( quite different from my 70 BSA ).
I already read about conversion to the roller bearing done by Kommando, but am curious what other people using them think.
They were used on A 65 nearly to the end of production and changed to bushes in 69 model, so I expect them to be relatively problem free. In my youth I used to have a bike with such swingarm silentblocks and don't remember any problems with bike riding abilities, but what we remember from our youth is very often not accurate.

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Re: A65 swingarm silentblocks [Re: Adam M.] #780313 08/02/19 12:27 am
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Jon W. Whitley Offline
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I will venture to repeat the old adage that "if it ain't broke, don't fix it."


Jon W.


1957 6T Thunderbird 650
1968 T100R Daytona 500
1971 TR6R Tiger 650
1970 BSA A65F 650
1955 Tiger 100 - Project
1971 BSA A65 650 - Project
1972 Norton Commando 750 "Combat"

Re: A65 swingarm silentblocks [Re: Adam M.] #780323 08/02/19 2:32 am
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Tridentman Online Content
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I have ridden many tens of thousands of miles on BSA A7s and A10s----many with a sidecar attached.
The A7/A10 swinging arm Silentbloc was virtually identical to that in the early A50s/A65s.
The Silentbloc (no k) performs very well over very high mileages.
I would not change it unless there is perceptible play in it.
Problems when they arise are often due to oil getting into the rubber and degrading it.
Changing them is a real bast**d of a job.
I remember once when I was about 20 having to change one.
The only way we could get the damn thing out was by burning the rubber out using an oxy-acetylene torch.
There was so much black smoke that some stupid neighbor called the fire brigade!
Best of luck with the bike!

Re: A65 swingarm silentblocks [Re: Adam M.] #780325 08/02/19 3:06 am
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BSA_WM20 Offline
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And because 3 yeses are better than 2
IT is not the absolute best type of bushing but for the power output & type of riding we do is very hard to beat.
If you are thinking of doubling the Hp then it might come up a little short
I have done hundreds of thousands of miles on good ones & old ones that were rock hard without a spot of bother.
OTOH the rollers fitted to my SR 500 required replacement every year .
People conflate our 40Hp ploddres with problems that become apparent with 200 Hp rocket ships.


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Re: A65 swingarm silentblocks [Re: Adam M.] #780362 08/02/19 12:35 pm
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gavin eisler Online Content
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+4 for leave them alone, they work very well. I am not sure why BSA changed them to plain bushes, possibly because the later OIFs went the same way adopting the bush from triumph practice.
I know from experience that worn bushes are very noticeable compared to sound silentblocs. Perhaps some of the silentbloc scares come from a popular mod on Norton featherbeds, road models used silentblocs, suppliers such as Unity Equipe used to offer a " manx" conversion which replaced the rubbers with plain bushes, supposedly to sharpen the steering up. I doubt if anyone would be able to tell the difference.


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Re: A65 swingarm silentblocks [Re: Adam M.] #780388 08/03/19 12:38 am
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Adam M. Online Content OP
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Thanks for the answers, guys.
I will do according to your advice - lots of experience between four of you + my experience with my own roller bearing conversion in 70 BSA I sold which wasn't the best. After a couple of years my swingarm got notchy and stayed notchy, one side more than the other.
Not possible to feel during normal riding, but I knew and wasn't very happy about it.

Re: A65 swingarm silentblocks [Re: Adam M.] #780832 08/07/19 4:48 pm
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I spray painted my B40 frame instead of Powder-coating it because of the silentblok bushings, I didn't want to disturb them nor replace them

After all these years, I have not had an issue


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