The BSA A7-A10 Forum

Technical => Clutch, Primary, Gearbox => Topic started by: wilko on 03.07. 2013 09:20

Title: Clutch?
Post by: wilko on 03.07. 2013 09:20
Anyone here with a complete six spring clutch they dont want? Need one for a BB34 single with a plunger single gearbox? I'm presuming they are the same for A10's? I live in Victoria.Thought of a Triumph clutch conversion but  what adaptor for a Rigid or plunger box. I doubt they would make one.
Title: Re: Clutch?
Post by: chaterlea25 on 04.07. 2013 00:02
Hi Wilko,
I have fitted 4 spring clutches to a couple of plunger framed singles
The adaptor taper is bored deeper so as the clutch will sit further in on the gearbox shaft
On one bike I also had to shim out the cushdrive sleeve a bit
On another ZB single The adaptor I bought at an autojumble fitted perfectly and primary chain alignment is perfect

Its worth the effort  *smile* *smile*

HTH
John
Title: Re: Clutch?
Post by: Topdad on 04.07. 2013 10:28
Thats interesting John , a friend just got a ZB we#re sorting the gearbox but haven't thought about the clutch and he's going to 2 bike jumbles shortly so I'll tell to look out for these adaptors,regards BobH.
Title: Re: Clutch?
Post by: chaterlea25 on 04.07. 2013 22:38
Hi Bob,
If buying from an autojumble you really need the gearbox shaft with you as it is very hard to distinguish single and twin type adaptors just by looking at them  *conf*
It can take a bit of work to get it all lined up depending on the adaptor, finding an original one made all the
difference to the bikes I converted

HTH
John
Title: Re: Clutch?
Post by: wilko on 05.07. 2013 01:32
Well i tried a plunger adaptor on a swinging arm box and it sits about 1/4 inch out further. So yes you would have to carry a rigid or plunger mainshaft around with you.
Title: Re: Clutch?
Post by: berger on 20.01. 2020 00:13
I have not been to the pub, I got a clutch adaptor from flea bay to fit the triumph clutch on the rrt2 which is now nicely in place on betsy the beezer. don't you just hate pattern parts!! with this adaptor I would have ended up with a 4mm spacer behind the crankshaft engine sprocket sleeve to line things up *problem*. luckily for me I had found an original one of these adaptors some months ago --BUT only after I had bought the pattern one *bash* *pull hair out*. the original fits bang on in line with the crank sprocket so I am now a happy bunny. does anyone want to buy a 4 spring clutch adaptor that I am sure will fit YOUR!!!! gearbox mainshaft bang on *dribble* o well I deserve a slurp tomorrow because these kind of jobs take a lot longer than you first think, ps I am glad i'm doing it inside with a nice open fire because otherwise I would have gone to the PUB! *beer* *beer*
Title: Re: Clutch?
Post by: berger on 20.01. 2020 11:50
can anybody tell me if there was or should be a ball bearing in the button on the pressure plate of the 4 spring clutch? the one I have looks like it once had one in it and I haven't got a clue, cheers *beer*
Title: Re: Clutch?
Post by: JulianS on 20.01. 2020 12:01
No ball just the hardened button.
Title: Re: Clutch?
Post by: berger on 20.01. 2020 18:07
cheers JulianS *beer* just got to get the badly made nut for the mainshaft sorted now , maybe at the local model engineers club.
Title: Re: Clutch?
Post by: JHG1958 on 16.02. 2020 20:14
Yes I have 2 (don’t ask why). I plan to get a new clutch from SRM with a belt drive as I have some wrist problems.  Drop me a message and we can sort something out.

John