Author Topic: bsa a10 clutch id (Read 14320 times)

a10sausage · « **on:** 25.06. 2009 17:17 »

hi folks...i have just removed the primary case on my goldflash and i am popping new plates and springs in.....i got a bit of a shock and found this clutch....is it from an a65...any info would be ok.....the plates and springs went stright in that i bought for a 4 spring version....cheers

snowbeard · « **Reply #1 on:** 25.06. 2009 17:28 »

interesting! the basket looks appropriate for an A10 6 spring clutch, but someone must have changed the pressure plate? perhaps you can take three studs off the inside hub of a 6 spring and use this three spring cover? or they may have replaced the hub with a three spring one, but I don't know the arrangement of the teeth in a three spring...

I bet it is only the cover replaced, since your 6 spring plates fit?? someone else with a broader knowledge should be along shortly

very interesting, maybe I will try to find one of these covers after all if it turns out to be an easy conversion! maybe when you have it apart you can get pics of more of the internals?

a10sausage · « **Reply #2 on:** 25.06. 2009 17:37 »

the whole clutch is a 3 springer....and the friction plates and pressure plates that i have just put in are for a four spring as i bought these thinking i was going to find a four spring clutch when i removed the primary case cover...i have just installed the plates and springs as the where the same as the ones i have just removed from this 3 spring clutch....i have just test ridden it and given it a good thrashing and its a fantastic clutch...no slip...perfect smooth action......yee haaa!...ps....i am glad i changed the plates as i found the cush drive on the end of the crank had wound out and shed its split pin....i have fixed that as well....phew!

snowbeard · « **Reply #3 on:** 25.06. 2009 17:41 »

oh ho! I was just admiring the rest of the bits in the pic, like the extension on the sidestand (man I hate trying to dig that thing out from under my hot pipe with a boot edge) and I noticed your cush drive is stuck! I had a similar issue with mine getting bound at full spring compression. I didn't notice so much in the ride, but once I knew it was like that I had to get it freed up before I was comfortable riding it again...

your nut (which is in good nick, not all beat like most) may have loosened and allowed enough room for the lobes to get stuck, or it could be put together with an incorrect spring? too few turns could allow it to bind, but the right spring should bottom out before the lobes get crossed enough to stick, pointing to a loose nut.

just one more thing to obsess over

a10sausage · « **Reply #4 on:** 25.06. 2009 17:44 »

hi snowbeard....spot on observation on the cush drive....its now fixed.....i found its split pin on the bottom of the primary case!

Richard · « **Reply #5 on:** 25.06. 2009 18:04 »

Snowbeard
it is such an easy mod to the side stand

I x old bolt, 1 X stick welder, 5 minutes job done no more melted boot on the exhaust pipe.
one of the first mods done to the S/R.
Drop it of at Minety and I will do it for a pint

Richard

snowbeard · « **Reply #6 on:** 25.06. 2009 18:26 »

thanks Richard, I could probably try it myself but I have only a 110V wire feed welder? where is Minety in any case?? I'm out in Colorado, near Denver...

a10sausage · « **Reply #7 on:** 25.06. 2009 18:53 »

might be on to something...i think it might be a triumph t14o clutch that also fits an a65

snowbeard · « **Reply #8 on:** 25.06. 2009 19:11 »

I have to say up front I know little to nothing about this topic, but I am interested to learn and have been trying.

I had thought I gathered that most unit clutches were two or three row chains? are there some that have single row baskets?

LJ. · « **Reply #9 on:** 25.06. 2009 19:15 »

Hope you did that cush nut up really tight! its a common mistake to allow the split pin to do the work of keeping the nut on, hence what happened to your one. I think also that nut has the job of holding everything up to the main bearing or pulling the bearing towards it... someone will explain better I expect. What about the condition of the crankshaft splines? There is a new thread here just started about them.

Great news that the clutch is better, I've heard that it is a good clutch the three spring one and I do believe it is a BSA one. I have in my Big Box of Bits a single spring one that I'm tempted to fit, dunno how it will hold up to the phenomenal power of the A10!

coater87 · « **Reply #10 on:** 25.06. 2009 20:34 »

Wow!

This is really interesting! My clutch is a six spring, and I have no idea how they managed it but EVERY bolt is bent and stripped smooth.

Does anyone know if this is a possible bolt on, or anything about this conversion at all (like part #s

).

Lee

LJ. · « **Reply #11 on:** 25.06. 2009 22:17 »

Quote

This is really interesting! My clutch is a six spring, and I have no idea how they managed it but EVERY bolt is bent and stripped smooth.

These old bikes hold alsorts of mysterious suprises eh!

Richard · « **Reply #12 on:** 25.06. 2009 23:28 »

Snowbeard
Minety is in the deep south west of the UK in a county called Wiltshire very near to where the Famous Cricklade branch of the BSAoc started, I was only joking about bringing it here but if you want to that will be great.
LJ
I do beleive you can fit a tab washer to the cush drive, they fit them on the unit singles but I do not think they have the split pin I think that by the time the nut gets to the split pin you would or should hear the nut rubbing against the chaincase cover, so you are correct in what you say.

"BSA - GOLD STAR cushdrive nut tab washer 65-2521" this is the same part for the b33 which I had in my box of spares so when I did my A10 rebuild I fitted that to the cush drive assy.
Richard

snowbeard · « **Reply #13 on:** 25.06. 2009 23:54 »

ha, Richard, be right by then...

LJ. · « **Reply #14 on:** 26.06. 2009 08:09 »

Quote

you would or should hear the nut rubbing against the chaincase cover

Ha Ha! But I wouldn't would I?

and your right in what you say about the tab washer... *IF* you can get your fingers in between the spring coils to tab it over, its a sod of a job. My M21 has no split pin at the end of the crankshaft and I worry about that sometimes. All good stuff though eh?

Now Richard... How about a small Avatar photo so we can follow who this 'Minety' guy is, easy to do and i'll follow you through with some help if you need be.