Author Topic: Magneto  (Read 365 times)

Online manxman

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Magneto
« on: 28.10. 2019 05:44 »
How do I connect a magneto cut out to turn off the motor. There is nothing in my new wiring harness to cut off the ignition !

Online Triton Thrasher

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Re: Magneto
« Reply #1 on: 28.10. 2019 06:29 »
Run a lead from it to a handlebar button that earths it to the bar when you press the button.

Online Greybeard

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Re: Magneto
« Reply #2 on: 28.10. 2019 08:54 »
How do I connect a magneto cut out to turn off the motor. There is nothing in my new wiring harness to cut off the ignition !
There are some mag end caps with a stop button built in.

Online manxman

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Re: Magneto
« Reply #3 on: 28.10. 2019 11:21 »
I was inquireing about how to connect to the mag. There is no connection on the cap.

Online Greybeard

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Re: Magneto
« Reply #4 on: 28.10. 2019 12:03 »
I was inquireing about how to connect to the mag. There is no connection on the cap.
I think, most are like pic 1
Then there are these, in pic 2

I cannot find an image of one with the stop button in the cap.

Offline lawnmowerman

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Re: Magneto
« Reply #5 on: 28.10. 2019 12:46 »
I was inquireing about how to connect to the mag. There is no connection on the cap.
I think, most are like this: https://tinyurl.com/y2prox25
Then there are these: https://tinyurl.com/y5keh9vl

I cannot find an image of one with the stop button in the cap.

GB. I have one fitted as standard on my 1960 Matchless G12. Aluminium dome with a metal pushbutton in the middle.

Jim
1959 A10 SR
1938 Wolseley 14/60
1955 Ferguson TEF20 tractor
1965 Ferguson 135 tractor
1952 Matchless G80 rigid
1960 BMW R60
1954 Matchless G80S
1955 Ariel 500 VH
1951 Sunbeam S7DL
1960 Matchless G12 with Watsonian Monza
......and loads of lawnmowers

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Online Triton Thrasher

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Re: Magneto
« Reply #6 on: 28.10. 2019 12:57 »
I was inquireing about how to connect to the mag. There is no connection on the cap.

Post a photo.

Online groily

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Re: Magneto
« Reply #7 on: 28.10. 2019 13:09 »
Here's one, on a mag (off an AMC twin). But the stop button has been replaced by an insulated sleeve, brush and spring, for remote stop. Which may provide a useful clue if it's this sort in question. Originally, there was just a mushroom-headed bit of spring-loaded bar, that shorts out the live cb centre screw when you press it. Not handy, some say (including me), hence mods.

There are plain end covers, held by a pillar and clip, with no take-off for a wire or button even - but they usually live on K1Fs which people stop with the decompressor.

The three basic standard K2F versions have provision, with a wire off the plastic covers retained by pillar and clip, or via a stud connected to a brush and spring in the middle (big screw-on alloy type) - or there's the button sort.

On BSAs I think - but not completely sure - that the alloy dome was used on some twins in the early-to-mid 50s, before going to the clip-on plastic sort with wire off, and then finally to the screw-on alloy job towards the end.
Bill

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Re: Magneto
« Reply #8 on: 30.10. 2019 00:23 »

 manxy- may I suggest an edit to the topic to specify something more specific ie; "Magneto End cover/cutout....?"

 Until you post a pic we can only guess, but for what it's worth in my case I did much as groily suggested, having soldered a washer over a short length of copper pipe inside plastic tube on the inner end, and a fibre washer over the copper (cut plastic flush and made copper protrude past cover to accommodate f-washer) outside, and a set screw up the end, works a treat *wink2*
Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'
Have a '74 850T Moto Guzzi since '92-best thing I ever bought doesn't need a kickstart 'cos it bump starts sooooooooo(mostly) easy
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Re: Magneto
« Reply #9 on: 30.10. 2019 09:42 »
G'day manxman.
After you work out the kill botton/switch and it won't work. Have a look at the other end of the mag is a screw. It houses the earth brush. If this isn't right you won't be able to kill the motor (unless you stall it).
This was the first problem I had with my plunger 38 years ago.
Cheers
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
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Offline Slymo

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Re: Magneto
« Reply #10 on: 30.10. 2019 21:48 »
No earth brush is more serious that as the mag armature will earth via the bearings which will gently spark erode.
NZ

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Re: Magneto
« Reply #11 on: 31.10. 2019 07:23 »
^^^ bugged if mine would. A  Carbon out of a C size battery fixed it.
Cheers
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
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Muskys Plunger A7