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#251441 - 05/02/09 8:35 pm auto-advance unit  
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nert Offline
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nert  Offline
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just a guy from Jersey [Hopewe...
can any one tell me what this Lucas auto-advance fits?
54427182, its CCW and it is 12'


keep your "oddies" lubricated, and carry a dime
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#251450 - 05/02/09 10:50 pm Re: auto-advance unit [Re: nert]  
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DMadigan Offline
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ca, us
Rotation is easy to tell, hold the taper and twist the point cam. Whichever direction causes the bob-weights to move outward is the direction of rotation. Look in the back, thee usually is a degree marking. That number is not listed for the triple or the '71 A65.

#251514 - 05/03/09 10:37 am Re: auto-advance unit [Re: nert]  
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Rich B Online happy
Rich B  Online Happy



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Stone Creek OH USA
Good question Nert, none of my Lucas stuff lists anything for that P/N as far as fit.


Life is too short to drink cheap, bad beer.
#251530 - 05/03/09 12:11 pm Re: auto-advance unit [Re: Rich B]  
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BSA_WM20 Online content
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BSA_WM20  Online Content
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Sydney Australia
Well 12 deg on the cam is 24 deg BTC and that is not ringing any bells for me.
The aa units were common to every British bike so it could be virtually from any thing post 1959 ( which is about when they started using that unit me thinks)


Bike Beesa
Trevor
#251554 - 05/03/09 2:04 pm Re: auto-advance unit [Re: BSA_WM20]  
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Alex Offline
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Seattle
It's a late Norton 6ca AAU unit that will work with most nortons and BSA's. 12 degree is standard for most british singles and twins and both BSA's and Nortons have the points cam rotate CCW.


A smattering:
'53 Gold Flash
'67 Royal Star
'71 Rickman Metisse
'40 Silver Star
'37 Rudge Special
sixtyseventy Lightboltrocket road racer...and many more.
#251569 - 05/03/09 2:53 pm Re: auto-advance unit [Re: Alex]  
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nert Offline
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nert  Offline
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just a guy from Jersey [Hopewe...
Thanks ALL
Alex, i have noticed in other posts you have an amazing amount of information. thanks for your reply. I have searched the net, brit parts houses, etc and can not find reference to that number. I have a NOS one available to me to purchase. I was hoping it would fit my 6ca BSA lightning, and i guess it will.
thanks


keep your "oddies" lubricated, and carry a dime
#251577 - 05/03/09 3:12 pm Re: auto-advance unit [Re: nert]  
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Alex Offline
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Nert,

MAP and BO price list show it as being a replacement for 54419653, really intended for unit singles. I don't know what the difference is between that and a twin AAU unit. They look identical to me, have the same amount of advance, so maybe the springs are different? bob weight mass? I dunno but it seems like it should work fine. Supplier parts catalogs and price lists and can be very useful in this respect.

Good luck.


A smattering:
'53 Gold Flash
'67 Royal Star
'71 Rickman Metisse
'40 Silver Star
'37 Rudge Special
sixtyseventy Lightboltrocket road racer...and many more.
#251593 - 05/03/09 5:01 pm Re: auto-advance unit [Re: Alex]  
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nert Offline
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nert  Offline
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just a guy from Jersey [Hopewe...
I wonder if the difference is in the cam profile? The points dwell? The weights differance or spring spec doesn't bother me. Full advance normally comes on at about 2000RPM. So i can "adjust that".

If the cam profile is different, I would hate to create the same problems that the 4ca cam profile produced.

Do you know what a good 6ca advance part number would be? I prefer a point system over the Boyer and electronic systems available. And of course NOS is better than used.
thanks

Last edited by nert; 05/03/09 5:04 pm.

keep your "oddies" lubricated, and carry a dime
#251664 - 05/04/09 1:28 am Re: auto-advance unit [Re: nert]  
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EWebster Offline
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What is wrong with the advance unit you have already? Did it end up being an older style?

#251706 - 05/04/09 7:02 am Re: auto-advance unit [Re: EWebster]  
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BSA_WM20 Online content
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Nert.
TTBOMN there were only 2 cam profiles.
The standard egg shape for battery ignitions
Base circle with a flat for ET & magneto flywheel ignitions.

All bob weights are the same size and weight.

There seems to be an infinite number of different size & strength of springs


Bike Beesa
Trevor
#251785 - 05/04/09 2:07 pm Re: auto-advance unit [Re: BSA_WM20]  
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nert Offline
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just a guy from Jersey [Hopewe...
Thanks Trevor
that makes me feel better.

EWebster, my advance unit it showing a bit of wear, spindle to cam center, so it does make it a bit difficult to adjust points accurately and keep ignition timing consistent.


keep your "oddies" lubricated, and carry a dime
#251903 - 05/05/09 4:07 am Re: auto-advance unit [Re: nert]  
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EWebster Offline
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The number you want for an A65 with a 6ca is either 54419344 or 54426429 the one you asked about is not suitable for a twin. They are not difficult to find.

#251944 - 05/05/09 1:19 pm Re: auto-advance unit [Re: EWebster]  
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Alex Offline
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Originally Posted By: EWebster
The number you want for an A65 with a 6ca is either 54419344 or 54426429 the one you asked about is not suitable for a twin.


What's different about them?


A smattering:
'53 Gold Flash
'67 Royal Star
'71 Rickman Metisse
'40 Silver Star
'37 Rudge Special
sixtyseventy Lightboltrocket road racer...and many more.
#252177 - 05/06/09 12:14 pm Re: auto-advance unit [Re: Alex]  
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BSA_WM20 Online content
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Sydney Australia
I have a stack of unit single aa units and a couple of now redundant A 65 ones and I can see no difference in the cam profiles between the B 50 , B 44 & the A 65 ones.
When pulled apart the only difference that I could see was the springs and the hole in the plate to control the advance.
I even have a couple of plates with 2 different holes, stamped with 2 different advance numbers


Bike Beesa
Trevor
#252183 - 05/06/09 12:42 pm Re: auto-advance unit [Re: BSA_WM20]  
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Mr Mike Offline
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Nert,
I don't recall you mentioning what bike you are fitting. I was never opposed to points. In fact my singles have points and the twin electronic. I have interchanged AA's from different bikes and the seem to work just fine. Everything was either points or magneto when I grew up so fiddling with points was never an issue. I decided to go ahead and fit my 66 A65 with a Boyer as timing the earlier bikes with the 4ca pints was very ticklish. I can tell you that the Boyer also provided a more gentle advance that largely cured pinking. I have't had the points cover off in years on the a65 so there is something to be said for the Boyers. Your timing never changes whereas with points it does change as the rublock wears or the points deteriorate thru arcing. But is is a personal choice. The big advantage with points is that you can carry cheap spares in the event you do have a problem out on the road Bnd you can run a long way off a battery if you have charging system problems. I once made it home on battery voltage of about 6-7 volts when a wire from my alternator broke. When you drop below about 10 volts with a Boyer it quits sparking. This site has guys that are strictly electronic and others that prefer points. I guess I am somewhere in between. Also setting points within a few thousandths with trifocals down on your knees is another reason to support Boyer, but it's a personal choice.

Mr Mike

#252221 - 05/06/09 3:44 pm Re: auto-advance unit [Re: Mr Mike]  
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SBoyd Offline
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""TTBOMN there were only 2 cam profiles.
The standard egg shape for battery ignitions
Base circle with a flat for ET & magneto flywheel ignitions.
BSA WM20 ""


That statement seems to be exactly backwards
egg shape is for magnetos or ET
circle with flat spot is for battery ignitions.
>>sb

Last edited by SBoyd; 05/06/09 5:40 pm. Reason: added info

Stop the insanity.
#252242 - 05/06/09 6:13 pm Re: auto-advance unit [Re: SBoyd]  
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nert Offline
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nert  Offline
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just a guy from Jersey [Hopewe...
MR Mike
I have a 66' lightning. I picked up a used 6ca aau and points plate of e-bay. As it is worn and i am in the middle of a rebuild, i wanted to find a new old stock unit to put in.
BSA_WM20
Its amazing how we all collect these little "bitsa" parts. Can't throw any thing out. It has to be better than some other one, and gee it has to have value. Ive waste a lot of time and money replacing a part to one a little better than what i have. Than another one, a little bit better comes along. Before ya know it, ya got a collection. So, now i am looking for NOS.


keep your "oddies" lubricated, and carry a dime
#252312 - 05/07/09 1:06 am Re: auto-advance unit [Re: nert]  
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Mr Mike Offline
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Nert,
A 6ca is a big improvement over what came in the bike. Do you still have the Monoblocs?

Mr Mike

#252322 - 05/07/09 2:26 am Re: auto-advance unit [Re: Mr Mike]  
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nert Offline
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nert  Offline
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just a guy from Jersey [Hopewe...
Mr Mike
yes. the monoblocs are on there. I don't like to change things and upgrade too much. I like it authentic and original. IF i wanted the latest technology and updates, i would buy a new bike.


keep your "oddies" lubricated, and carry a dime
#252383 - 05/07/09 2:01 pm Re: auto-advance unit [Re: nert]  
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Alex Offline
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Seattle
Hey Nert, Monos are great carbs. Better built than concentrics and look the part to boot. Good on ya for keeping them.


A smattering:
'53 Gold Flash
'67 Royal Star
'71 Rickman Metisse
'40 Silver Star
'37 Rudge Special
sixtyseventy Lightboltrocket road racer...and many more.

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