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About Magneto and Dynamo

Norton Models (not Commando or P11)

About Magneto and Dynamo

Postby pierodn » Sun Mar 05, 2017 3:24 am

Hi.
I am looking for to buy a Magneto and Dynamo for my Norton 99 engine.
I have seen a lot of these parts on ebay, but before to buy them i want to know what are the right parts.
Please, can you explain?
Thanks for help.
Piero

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Re: About Magneto and Dynamo

Postby Rohan » Sun Mar 05, 2017 3:30 pm

What year is this 99 engine Piero.

What does the parts book say about them ?

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Re: About Magneto and Dynamo

Postby pierodn » Sun Mar 05, 2017 11:40 pm

Rohan wrote:What year is this 99 engine Piero.

What does the parts book say about them ?


Hi.
Engine is 1957.
A lot of MagnetoLucas Model K2F are for sale on Ebay.
But the Magneto must be clock or anti clock wise, for the Norton engine?
If i think to the rear distributor points of my Atlas/P11, it turns clockwise so i think the magneto must be clockways too.
But i am not sure.
I dont have the parts book, sorry.
Piero

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Re: About Magneto and Dynamo

Postby dynodave » Mon Mar 06, 2017 6:13 pm

Piero
I have 4 mag/dynamo engines.
1950, 52, 53 and 1957-99 # 75050 (last engine for 1957 per BruceMain-Smith book)
They all have mag 42111 D or H The 99 mag may not be correct date is 1955
Remember to look out for AAU also... Automatic Advance Unit
free forum information is very often worth about 1/2 of what you paid for it.
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Re: About Magneto and Dynamo

Postby Rohan » Mon Mar 06, 2017 9:18 pm

pierodn wrote:But i am not sure.


How can you restore a bike without having the parts book ? !!
Always worth checking what it says in there first.

If you look into the timing chest of any dommie engine, you can figure out which way everything rotates.
The crank turns forwards (clockwise), the half time gear reverses it (so its anti-clock)
and the magneto and camshaft are same as the half time gear - so both anti-clock.
And the generator is gear driven so reverses (again), so its clockwise.
All looking into it from the oil pump side.

So you need an anti-clockwise K2F, and a clockwise E3L

Watch that Triumph used a very similar anti-clock K2F,
and a similar generator - but it spun anti-clock = opposite !! so not so similar...

The direction of spin can be reversed, by changing components, but will cost $$...
And unless its says they are completely rebuilt, anything you find will likely need a rebuild...

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Re: About Magneto and Dynamo

Postby pierodn » Tue Mar 07, 2017 12:16 am

Rohan wrote:So you need an anti-clockwise K2F, and a clockwise E3L


Hi.
May be the contrary?.
If you see from the timing side AAU, the magneto turns anticlockwise but if you see from the left rear side the magneto turns clockwise.
About E3L, i have found a E3CL, it is the same or works the same?
Let me understand better, please.
Thank you.
Piero

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Re: About Magneto and Dynamo

Postby Rohan » Tue Mar 07, 2017 1:21 am

pierodn wrote:but if you see from the rear the magneto turns clockwise.
Let me understand better, please.


So if you stand in the right spot, it will always be spinning whichever way you need ??? !!! ??? !!!
nope...

The little label on a K2F tells you all you need to know.
And is ALWAYS viewed from the DRIVE END of the magneto.

Image

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Re: About Magneto and Dynamo

Postby Rohan » Tue Mar 07, 2017 1:58 am

Not sure I know what an E3CL is - not in my Lucas lists.

It has to have the 3 fitting screws provision like this one - at 9, 12 and 3 oclock.
If not, it likely won't fit a dommie.
Pardon the rust, it hasn't been used since 1952.

Should be clockwise too - big arrow on the body.
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Re: About Magneto and Dynamo

Postby pierodn » Tue Mar 07, 2017 4:38 am

Hi Rohan and Dyno,
thank you for your precious help.
Piero

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Re: About Magneto and Dynamo

Postby pierodn » Thu Mar 09, 2017 12:17 am

Hi.
Please, this magneto works for 99?

http://www.ebay.com/itm/Norton-Atlas-K2 ... 0e&vxp=mtr

Thank you.

Piero

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Re: About Magneto and Dynamo

Postby dynodave » Thu Mar 09, 2017 5:14 am

pierodn wrote:Hi.
Please, this magneto works for 99?

http://www.ebay.com/itm/Norton-Atlas-K2 ... 0e&vxp=mtr

Thank you.

Piero



ebay one would probably fit.
The guy says it "was pulled from a 63 atlas".
He might not be lying BUT it is NOT a 63 atlas mag.
63 is K2FC 42368D I have two of them for my bikes
It is a bitza. tag says 42453 2-67, but the parts on the points end are from an earlier mag like a 42111.
I may be out of touch, but IMO way to much money for a core that needs rebuild..
first thread on shaft looks mashed
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Re: About Magneto and Dynamo

Postby Triton Thrasher » Thu Mar 09, 2017 10:47 am

Reversing dynamo direction of rotation is easy and free.

But first you've got to know that your dynamo has the wrong direction.
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Re: About Magneto and Dynamo

Postby Rohan » Thu Mar 09, 2017 6:40 pm

Yes, although bear in mind that armatures are wound to suit direction of rotation.

If they are spun in t'other way, the output is less.
Although the difference may be slight....

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Re: About Magneto and Dynamo

Postby Bernhard » Sat Mar 11, 2017 4:39 am

dynodave wrote:
pierodn wrote:Hi.
Please, this magneto works for 99?

http://www.ebay.com/itm/Norton-Atlas-K2 ... 0e&vxp=mtr

Thank you.

Piero



ebay one would probably fit.
The guy says it "was pulled from a 63 atlas".
He might not be lying BUT it is NOT a 63 atlas mag.
63 is K2FC 42368D I have two of them for my bikes
It is a bitza. tag says 42453 2-67, but the parts on the points end are from an earlier mag like a 42111.
I may be out of touch, but IMO way to much money for a core that needs rebuild..
first thread on shaft looks mashed


+1
Atlas had a K2FC from the factory, this might have been swapped by a P.O, but if it rotates the right way round would still do the job.

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Re: About Magneto and Dynamo

Postby Rohan » Sat Mar 11, 2017 4:26 pm

Having an auto advance unit instead of manual spark advance makes a lot of sense these days.
And for probably most of the past 50 years as well......

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