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About Magneto and Dynamo

Norton Models (not Commando or P11)

Re: About Magneto and Dynamo

Postby Triton Thrasher » Sun Mar 12, 2017 12:22 am

Rohan wrote: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......



I've tried manual advance on singles and twins and it's hard to see the point of it.
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Re: About Magneto and Dynamo

Postby Rohan » Sun Mar 12, 2017 5:05 pm

Ditto - having manual control of the spark timing when auto advance does a great job just doesn't make sense.

Unless Lucas maybe had tons of spares for them ...??
Wasn't all magneto production to stop in 1963 (?).

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Re: About Magneto and Dynamo

Postby pierodn » Sun Mar 19, 2017 11:30 am

Rohan wrote: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.
Image


Hi.
Please, i can see from the picture the dynamo's gear.
But i dont know and i have never seen the camshaft sprocket with the dynamo gear.
Could you post a picture?
Thanks.
Piero

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Re: About Magneto and Dynamo

Postby Rohan » Sun Mar 19, 2017 3:38 pm

Bits as shown.

The fibre gear is approx 85 mm.
The camshaft sprocket needs to be of the generator drive type,
and also the star washer and the peg-driven flat ring.

Be aware that the single cylinder mag-dyno parts all look similar, but are not interchangeable. !
I don't know who's brilliant idea that was, but they should be crucified as a good start...

Image
hopethishelps.

Rohan
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Re: About Magneto and Dynamo

Postby pierodn » Sun Mar 19, 2017 9:28 pm

Rohan wrote:Bits as shown.

The fibre gear is approx 85 mm.
The camshaft sprocket needs to be of the generator drive type,
and also the star washer and the peg-driven flat ring.

Be aware that the single cylinder mag-dyno parts all look similar, but are not interchangeable. !
I don't know who's brilliant idea that was, but they should be crucified as a good start...

Image
hopethishelps.

Hi.
Thank you so much.
Fibre gear?
I had seen one in steel, are they different?
Piero

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Re: About Magneto and Dynamo

Postby Rohan » Mon Mar 20, 2017 12:41 am

pierodn wrote:I had seen one in steel, are they different?


You'd want to have a good close look at it, to see it was genuinely the same.
I've heard of them, but not seen one.

The large gear on the end of the cam as built by Nortons was a fibre gear, with friction drive.
This makes it run quiet.
I've also heard that in case of big troubles with the generator, the fibre gear will have some 'give',
rather than running everything to destruction - it will shed some teeth as a last resort !!

Tell us how the steel one goes ?

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Re: About Magneto and Dynamo

Postby Norton46 » Mon Mar 20, 2017 5:24 pm

For what it is worth!
Norton Model 99 equipment information from Lucas Master Catalog
Image
Image
Image
Image
Image

I have a much nicer Mag 42453A than the eBay item above, that is currently surplus to my needs. Would need to be rebuilt but it's all there and the threads are good.

Mark

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Re: About Magneto and Dynamo

Postby pierodn » Tue Mar 21, 2017 12:01 am

Thank you.
Piero

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Re: About Magneto and Dynamo

Postby pierodn » Mon Apr 03, 2017 1:28 pm

Hi agin.
Some doubt.
The mag is manual or utomtic or 88 and 99?.
Thank you.
Piero

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Re: About Magneto and Dynamo

Postby Rohan » Mon Apr 03, 2017 3:34 pm

What does the parts book say Piero ?
I don't know how you can restore a bike without a parts book....

Dommies for many years, from the 1st for 1949 even, got an auto advance unit and a K2F magneto.
And it was good...

It was only somewhere in the early 1960s that they (SS and Atlas only ?) suddenly had manual advance and a K2FC,
I still haven't seen a good explanation of why that might be.
Unless Lucas had a surplus of K2FC maggies ?

Auto advance is set and forget, it does it all for you.
Why go backwards ?

Rohan
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Re: About Magneto and Dynamo

Postby pierodn » Tue Apr 04, 2017 9:05 am

Hi Rohan.
I am not starting now with the 99 Bobber building.
But i still havent bought mag and dynamo.
Today there was one good usable K2FC manual to buy at good price on Ebay but
I still wayting for a reply from Skip to buy from him, but no news.
Remains the question about the differences from manusl and automatic: it means that manusl does not use the AAU and only the sprocket?
Regatds
Piero

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Re: About Magneto and Dynamo

Postby Bernhard » Thu Apr 06, 2017 6:36 am

Re; “Remains the question about the differences from manual and automatic: it means that manual does not use the AAU and only the sprocket?”

That is correct.

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Re: About Magneto and Dynamo

Postby pierodn » Mon May 01, 2017 12:00 pm

dynodave wrote: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


Hi Dino,
Please, can i use a 42111D on a 1964 650 SS?.
Thank you.
Piero

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Re: About Magneto and Dynamo

Postby Rohan » Mon May 01, 2017 2:35 pm

As long as it spins anticlockwise, it doesn't really matter what age of K2F you use.

One that is closer to the year of manufacture of your bike would be more authentic,
but this is neither here nor there.

You'll need the auto advance unit = aau.

Compy maggies (K2FC) supposedly supply a stronger spark than the K2F at high rpms - for high speed cruising.
But if you intend to cruise at +100+ mph all day, you have probably got the wrong bike ?

Rohan
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Re: About Magneto and Dynamo

Postby pierodn » Sat May 06, 2017 12:09 pm

Hi.
Please, two questions about my AAU.
First: it is complete but rustied and seems seized. Is possible to desmount, it seems not!.
Second: even if it has sprocket 18 theet, there is not the number so i cannot recognized if it.
Thank you.
Piero

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