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Which Magneto is it?

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Post by ajcooper4 Sun Jul 12 2020, 16:36

As a newbie here I am on a steep learning curve - but enjoying it.

It may seem like a daft question but how can I tell which magneto I have on my Lister D. There do not appear to be any manufacturer's marks and I haven't taken anything to pieces yet!

Thanks for your help.

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Post by Appletop Sun Jul 12 2020, 17:02

Easy answer is to pop a photo up but as a newbie you can't.
Most D types had the Lucas RS1, latter ones had the Lucas SR2 and earlier the Lucas ML.
The RS1 is square, looks a bit like a loaf of bread (Wholemeal, not white) and has a Bakelite top, the SR1 is also sort of squarish with a rounded bottom and the whole end of that is either Bakelite or pressed tin with the HT lead coming out of that end, the ML is a much rounder mag in general and has a round deep points cover.
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Post by Appletop Sun Jul 12 2020, 17:07

That's assuming it still has the original mag. It could have a Wico, BTH, Thompson Bennett, Hills and any one of a number of different ones been codged on over the years...
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Post by cranium Sun Jul 12 2020, 19:06

If you bought David Edgington's book,"The Lister D type Story", it would be an invaluable reference and would help you identify the magneto.
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Post by ajcooper4 Sun Jul 12 2020, 21:50

Thank you for all of that. The magneto I have is an offwhite colour on top - definitely not metal possibly bakerlite. One side has a half circle and from the other side runs the HT lead. That's as far as I have got!

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Post by nickh Mon Jul 13 2020, 13:05

Sounds like a Lucas RS1 https://www.themagnetoguys.co.uk/lucas-magnetos#&gid=1407295911&pid=60 top is usually black but I have seen them looking quite faded.
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Post by ajcooper4 Tue Jul 14 2020, 09:35

Pretty sure it's a Lucas RS1. The bakelite cover is extremely faded. When I've replaced the spark plug and HT lead I'll know if it's working!

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Post by Woodsman Wed Jul 15 2020, 09:13

ajcooper4 wrote:When I've replaced the spark plug and HT lead I'll know if it's working!

Just attach any old wire to HT and hold other end about 5mm from casing and flick it over by hand. Fingers crossed.

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Post by ajcooper4 Wed Jul 15 2020, 14:58

The existing HT wire is still attached to the top of the magneto casing. Can I use that for now for this test.

No probs. Go for it!

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Post by ajcooper4 Wed Jul 15 2020, 14:59

Also....sorry such a dim question but I've never had a Lister before...which way do I rotate the fly wheel as the original arrow markings have gone.

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Post by Appletop Wed Jul 15 2020, 16:07

If you are just turning it it doesn't matter, if you are trying to start it use the handle that came with it, assuming you have one? Standard rotation is clockwise as you look at the flywheel. Assuming you don't have a reverse rotation one...
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Post by ajcooper4 Wed Jul 15 2020, 17:24

I do have the starting handle and of course, now I think about it if I am checking for a spark it doesn't really matter. Unless I am being dim - again!

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Post by Appletop Wed Jul 15 2020, 17:37

If you have the handle it will only turn it one way.....
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Post by ajcooper4 Wed Jul 15 2020, 21:07

No spark across HT lead but...turn the handle quickly enough and there’s a clear spark across the points. There’s some life in it it would seem!

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Post by philipagri Thu Jul 16 2020, 07:02

Probably the condenser has failed. There should be two screws holding the bakelite top of the magneto on, be careful not to crack the top if they are on tight. The coil and condenser are underneath. You can replace it with one of the older style car condensers obtainable from motor spares shops but make sure it has the right terminals to fit where the old one comes out.
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Post by Woodsman Thu Jul 16 2020, 08:29

Condenser here

Also check resistance of HT side - between HT terminal and body.

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Post by ajcooper4 Thu Jul 16 2020, 20:46

A lot of resistance and no continuity. HT lead u/s without a doubt. Unfortunately in trying to remove it I have discovered how brittle and crumbly the bakelite top is. Can these be purchased separately does anyone know please?

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Post by Appletop Thu Jul 16 2020, 22:59

Probably, don't know of any offhand but Google might.
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Post by maryalice Fri Jul 17 2020, 07:56

photograph of top please, I cant promise but I might have one but need to see yours first.

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Post by ajcooper4 Fri Jul 17 2020, 10:06

Thank you so much. Here's the photograph.Which Magneto is it? Img_2010

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Post by maryalice Sun Jul 19 2020, 17:43

AJCOOPER4,
I checked my stock of bits and pieces but sadly
i dont have one.

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Post by ajcooper4 Sun Jul 19 2020, 18:15

maryalice wrote:AJCOOPER4,
I checked my stock of bits and pieces but sadly
i dont have one.

Maryalice

That's ok. Thank you so much for looking.

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Post by PetterAS Mon Jul 20 2020, 20:22

I had the Lucas RS1 from my Lister D rebuilt and it came back to me like new but sadly the top was smashed as the parcel hadn't been handled very carefully. I spent quite a bit of time searching the Internet for a replacement but couldn't find a supplier. As they are so brittle I'm not surprised that many will have broken over the years. In the end I managed to glue the puzzle back together and used some car body filler to sort the holes and cracks which remained then gave it a spray with black paint and it looks fine.

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