About Magneto and Dynamo

Rohan · Mar 20, 2017

pierodn said:
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 ?

Norton46 · Mar 20, 2017

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

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

pierodn · Mar 21, 2017

Thank you.
Piero

pierodn · Apr 3, 2017

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

Rohan · Apr 3, 2017

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 ?

pierodn · Apr 4, 2017

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

Bernhard · Apr 6, 2017

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.

pierodn · May 1, 2017

dynodave said:
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

Rohan · May 1, 2017

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 ?

pierodn · May 6, 2017

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

texasSlick · May 7, 2017

pierodn said:
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

Piero

It is possible to disassemble an AAU. A press is required.

I would send it to a repair shop .... try <http://www.davelindsley.co.uk/magneto-advance-retard-options.html>

Regarding number of teeth. The sprocket MUST have same number of teeth as sprocket on intermediate gear, or else it cannot run in time.

Slick

Triton Thrasher · May 7, 2017

The collar on the back of a Lucas auto-advance seems to be a slightly tapered press fit.

It is not impossible to dismantle and reassemble with hand tools, but it requires a man with a knack.

Rohan · May 7, 2017

texasSlick said:
Regarding number of teeth. The sprocket MUST have same number of teeth as sprocket on intermediate gear, or else it cannot run in time.

Indeed.
I don't think you can get an aau with 18 teeth that wouldn't fit a Norton ?
The springs are often rather past their best, plan on getting/fitting replacements.

I wasn't aware the aau came apart in any shape or form, I'd be curious if anyone has pics of this ?

Triton Thrasher · May 7, 2017

Rohan said:
I wasn't aware the aau came apart in any shape or form, I'd be curious if anyone has pics of this ?

It's not in the bike manuals.

http://www.britbike.com/forums/ubbthreads.php?ubb=showflat&Number=627815#Post627815

Rohan · May 9, 2017

Triton Thrasher said:
It's not in the bike manuals.

Now that is interesting. Whence cometh the pic ?
Lotta bits in this thing.

The first thing we notice is that is for a Turnip !
Could they be different, given that fibre gear there ?
If things are on a taper, couldn't that allow it to come apart in use ?
I can't quite see where any peening is holding it together ??

There are certainly some solid rivets used, in Nortons ones at least....

Triton Thrasher · May 9, 2017

Rohan said:
Triton Thrasher said:

It's not in the bike manuals.

Click to expand...

Now that is interesting. Whence cometh the pic ?
Lotta bits in this thing.

The first thing we notice is that is for a Turnip !
Could they be different, given that fibre gear there ?
If things are on a taper, couldn't that allow it to come apart in use ?
I can't quite see where any peening is holding it together ??

There are certainly some solid rivets used, in Nortons ones at least....

I've only seen one type of Lucas magneto auto advance. It can have different types of wheelie rivetted on. No doubt there are clockwise and anticlock types and no doubt they share most parts.

Triton Thrasher · May 9, 2017

Here's a set of instructions.

https://4ef41158-a-62cb3a1a-s-sites...Q-KGTxCpv7TnNxh-fFH1DHb8fHmr4=&attredirects=0

Rohan · May 9, 2017

Don't beat around the bush, say that RGM sell them and show them...
$$gulp$$

http://www.rgmnorton.co.uk/buy/magneto- ... y_4367.htm

Likewise the link, abbreviated.
Thanks ! - I think, I seem to need to update something to view it ?

https://4ef41158-a-62cb3a1a-s-sites.goo ... repair.doc

Cheers.

Triton Thrasher · May 9, 2017

Rohan said:
Don't beat around the bush, say that RGM sell them and show them...
$$gulp$$

http://www.rgmnorton.co.uk/buy/magneto- ... y_4367.htm

.

I don't know much about RGM, but I've never seen ATDs at a bargain price.

pierodn · Jun 9, 2017

Hi again.
A question please.
I have understand that for my 88 engine mag turns anticlock and dynamo clock.
But is the Dynamo 6 or 12 Volt?.
Thank you.
Piero

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