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BSA A65 Clutch differences info required please. #752167
10/10/18 1:08 pm
10/10/18 1:08 pm
Joined: Aug 2001
Posts: 175
england uk.
B
billy banger Offline OP
BritBike Forum member
billy banger  Offline OP
BritBike Forum member
B

Joined: Aug 2001
Posts: 175
england uk.
Hello Everyone, I am swapping out a clutch on a A65 engine which i think is circa 1965 Engine number A65 .E. 20xx I have the primary cover off and there is part of the clutch missing, namely the plates and outer cover plus cups, springs and screws and its a four spring one and i don't have an outer plate plus it looks like the plates are different on the tabs because my locking tool for the three spring clutch will not fit the four spring one. I have another motor and i have removed the clutch, chain and front engine sprocket and i wish to put the three spring set up on the A65 E Motor. Is this a straight swap out or is there something i should know about. Also the E motor has an open windings alternator which is five wire plus the rotor has no woodruff key fitted but has a thick washer with a peg in it which locates into the rotor and it is broached to go on the crank and it looks factory. Anyone know anything about this.
The other engine has an encapsulated Alternator and it also is a five wire. Is there anything special about these alternators, are they for ET Transfer ?. The encapsulated alternator also has a thick washer with the peg and is broached. Both rotors have three peg holes in them. One has the three holes in a triangle pattern An S by one hole An R by another hole and the other hole has a M by it. Is this for dialing in the fluxation of the magnets on a ET set up. The rotor off the E motor has two holes close to each other and one hole further away with an S next to it. If i decide to swap the alternator out for a two wire encapsulated one and i swap out the rotor, is the engine sprocket a different one to the keway rotor type. Any info gratefully received. Cheers. Billy.

Last edited by billy banger; 10/10/18 3:50 pm.
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Re: BSA A65 Clutch differences info required please. [Re: billy banger] #752190
10/10/18 3:54 pm
10/10/18 3:54 pm
Joined: Aug 2001
Posts: 5,103
Stone Creek OH USA
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Rich B Offline
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Rich B  Offline
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Joined: Aug 2001
Posts: 5,103
Stone Creek OH USA
The complete 3 spring can be swapped for the 4 spring complete. There is some differences in the slots of a 3 spring versus 4 spring is why you are having issues with your locking tool.

Both alternators are 5 wire ET alternators. The timing of the rotors with the pegged disc is shown in detail in the service manual I don't remember the details at the moment. Actually, I don't even remember what I had for breakfast frown. But, BA did explain which holes to use in the service manual.


Life is too short to drink cheap, bad beer.
Re: BSA A65 Clutch differences info required please. [Re: billy banger] #752209
10/10/18 6:49 pm
10/10/18 6:49 pm
Joined: Aug 2001
Posts: 4,107
argyll. scotland, uk
gavin eisler Online content
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gavin eisler  Online Content
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Joined: Aug 2001
Posts: 4,107
argyll. scotland, uk
The non ET rotor should engage on the shaft, so long as the shaft has a key way cut in it, I think this should work with the ET engine sprocket. but are you really going to use the original sprocket with a new / different clutch? Dont waste money on a new chain if you do.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: BSA A65 Clutch differences info required please. [Re: billy banger] #752245
10/10/18 11:42 pm
10/10/18 11:42 pm
Joined: Aug 2001
Posts: 4,552
Owego, NY, USA
Mark Z Offline
BritBike Forum member
Mark Z  Offline
BritBike Forum member

Joined: Aug 2001
Posts: 4,552
Owego, NY, USA
The doweled rotor and spacer ARE for ET ignition, but will work just fine with battery/coil ignition. The rotor should still have a keyway for a woodruff key, so this setup will work without the dowel if you fit a woodruff key. Also, it must have a matching crank sprocket, which is thinner than the non-ET crank sprocket by the thickness of the spacer.


Mark Z

'65(lower)/'66(upper, wheels, front end, controls)/'67(seat, exhaust, fuel tank, headlamp)/'70(frame) A65 Bitsa.
Re: BSA A65 Clutch differences info required please. [Re: billy banger] #752253
10/11/18 1:10 am
10/11/18 1:10 am
Joined: Nov 2012
Posts: 680
Isle of Wight, UK
K
koan58 Offline
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koan58  Offline
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K

Joined: Nov 2012
Posts: 680
Isle of Wight, UK
It is all ET stuff, unencapsulated early original. The other probably later aftermarket.
Read stuff like
http://www.britbike.com/forums/ubbthreads.php/topics/633297/1/repairing-an-et-ignition-system

It's a challenging prospect, but if you're familiar with Brits anyway, take it on! Otherwise Stuart has sensible advice.


Moderated by  Allan Gill, Jon W. Whitley 


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