BSA Owners' Club Workshop Discussions

The BSA Workshop => Twins => Topic started by: Mike Farmer on 21 Mar, 2019, 16:28

Title: A65 clutch springs.
Post by: Mike Farmer on 21 Mar, 2019, 16:28
 :)

Greetings.

This one really has got to me.

Many many times in the past I have assembled A50 A65 clutches(Plus a bunch of others) However I now have a serious problem because having tried every thing I know I cant compress the springs enuff to get the nuts on.

I know that there are deeper cups available but wonder what is the value of using them.

Could my bolts be too short. Its a 4 spring set up.

Your advice sought yet again.

Mike 8) 8) 8)
Title: Re: A65 clutch springs.
Post by: chaz on 21 Mar, 2019, 17:18
daft question?? are they the ones you took off?
been  few years since I did my thunderbolts 1966 and 1967, is it because they are not located so sitting on top of some lugs instead of down in?
as I said , its been a while
Title: Re: A65 clutch springs.
Post by: Bess on 21 Mar, 2019, 19:19
Hi,
    If it helps, bolts should be 1 7/8" long.

Best wishes...
Title: Re: A65 clutch springs.
Post by: Mike Farmer on 22 Mar, 2019, 13:57
 :)

Stripped it down. Mine are only 1+ 9/16th.
Probably only just enough to make that initial grip difference.
Just checking what SRM are selling will let you know. I know they are available at several other places.
I guess that I can always make some---that will be seriously boring????????
Mike 8) 8) 8)
Title: Re: A65 clutch springs.
Post by: A10 JWO on 22 Mar, 2019, 17:31
I bought a new set of springs last year, same problem. Longer springs ?? Bought a complete SRM Clutch in the end, brilliant.
Title: Re: A65 clutch springs.
Post by: Mike Farmer on 22 Mar, 2019, 19:40
 :) :)

After much speaky speak and assistance. It would appear that the length 1:9/16th is correct for the early 4 spring clutch. The later 3 spring clutch pins are indeed 1:7/8th.
So I shall simply fit the longer ones. If that all turns to worms for some reason I'll let you know. I assume the difference was to accommodate the extra clutch plate: thats a guess

Regards

Mike 8) 8)
Title: Re: A65 clutch springs.
Post by: Straw Bear on 22 Mar, 2019, 20:41
Hi Mike I had a similar problem with my A65 that I posted some time ago. I ended up with deeper cups because it was impossible to compress the springs. A friend of mine gave me an idea to use the old springs to align and compress the plates and change to new springs one by one. Hope that helps  :)
Title: Re: A65 clutch springs.
Post by: Mike Farmer on 23 Mar, 2019, 11:31
 :) :)

Hi all.

Thanks for your various inputs. Right now it all helps so as I said going to use longer bolts. There should be plenty of room so I don't see a problem. I particularly like the idea of using old springs to do the initial compression.
I also have a new set that are some 3/16th longer than the original. (Measured not guessed)

Mike 8) 8) 8)