External Pick Up

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Doom Patrol
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Fri Apr 27, 2018 2:04 pm

Now I'm an electrical dummy, so could someone explain to me, in laymans terms, how an external pick up on a flywheel works? Now, as I understand it the electrical spark is created when the trigger passes the pick up inside the flywheel. In the simplest terms, is it a question of moving the pick up and trigger outside the flywheel, because I'm not sure how that would work.

cgt75b
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Fri Apr 27, 2018 2:59 pm

Are we talking about the Anthony Tambs external pick up?

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HxPaul
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Fri Apr 27, 2018 3:09 pm

Anthony Tambs external pickuphttps://www.google.com/search?q=pictures+of+lam ... ETJ5Q9ClpM:

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Monty
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Fri Apr 27, 2018 3:34 pm

Not gone down the Anthony Tambs route myself but the next time I have stator problems I will be knocking on his door. But as I see it.
You have your stator lighting coils that you can convert to DC if you wish or stick to AC, Regulator to match.
You then have the low voltage coil and the trigger. Little black box bit on the stator.
That's the thing you are moving to set your desired timing of spark firing point. this is what Mr Tambs external pickup replaces. I say replaces as you can use a switch and switch from 1 to the other for belt and braces breakdown fault finding. (Nice at the side of the road) The benefit is you can adjust your timing without taking the flywheel off. its not going to rub the flywheel and get hot, the height of the pickup verses the magnets inside are not an issue etc etc. He is also along with others using coils (CDIs) that don't need the low voltage coil. This I think is very exciting as I'm sure half the problems we are all getting are due to these 2 unreliable parts of a stator. along with too many flywheel options along with stator options alignment issues pick up heights. Mr Tambs seems to have all basis covered. Not related or a salesman for the guy, but can he loose the pickup and LT coil from stators and give us more output with extra lighting coil....

GeorgeS
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Fri Apr 27, 2018 3:36 pm

You're just moving the trigger to the outside of the flywheel, replacing the red lead on your CDI, or use a switch so you can select which red-wire input is active on the CDI (maybe for different timing options or fall-back).

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coaster
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Fri Apr 27, 2018 3:58 pm

Pretty much all covered above but it should be mentioned that the external pickup needs a small piece of steel to be attached between the fins and it is this that causes the external pickup to 'trigger' evedry time it passes.

firekdp
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Fri Apr 27, 2018 4:03 pm

Doom Patrol wrote:
Fri Apr 27, 2018 2:04 pm
Now I'm an electrical dummy, so could someone explain to me, in laymans terms, how an external pick up on a flywheel works? Now, as I understand it the electrical spark is created when the trigger passes the pick up inside the flywheel. In the simplest terms, is it a question of moving the pick up and trigger outside the flywheel, because I'm not sure how that would work.
The external pickup is much simpler in construction than the original internal. It is simply a permanent magnet wrapped with a coil. Whenever a metallic object gets close to it, the flux lines get interrupted and a voltage is produced.
The Chinese scoots these come off normally have a raised piece on the flywheel to trigger it. As Coaster said, when used on a Lambretta you need to add this.

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jonzo172
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Fri Apr 27, 2018 4:08 pm

Richard Taylor has a very nice solution with an external pickup too...

http://www.lambretta-images.com/archive ... play_media

firekdp
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Fri Apr 27, 2018 4:18 pm

jonzo172 wrote:
Fri Apr 27, 2018 4:08 pm
Richard Taylor has a very nice solution with an external pickup too...

http://www.lambretta-images.com/archive ... play_media
Japanese quality as well!
Trouble is the Chinese components cdi's, pick up's by coils are available for a couple of quid, so most are fitting these.

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HxPaul
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Fri Apr 27, 2018 4:19 pm

coaster wrote:
Fri Apr 27, 2018 3:58 pm
Pretty much all covered above but it should be mentioned that the external pickup needs a small piece of steel to be attached between the fins and it is this that causes the external pickup to 'trigger' evedry time it passes.
As above link https://www.google.com/search?q=picture ... ETJ5Q9ClpM:

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