Lucas K2F magneto coil rewind

N_Cook · 2008-04-24T10:39:33+00:00

A pensioner has asked me about possiblity of rewinding some of these magnetocoils. on cm/mm graph paper.Orangey section is the laquered coil.C area is the contact patch (supplying 2 HT leads in turn) moulded into thesurrounding paxolin? insulation, continued out to the boss marked P, butotherwise looking like the tarnished brass sections in colour , marked B.The curve above the C is the shape of one end of this contact section, not atrick of the light.A is aluminium housing for the contact breakerFirst comment is he has 5 of these , all not working at all or properly, soprobably not good design anyway, as none were abused in use.He has one good magneto , he moves around 3 bikes. He can get some or allnonworkers commercially reconditioned , at a price each. But of course hewould like all 5 rewound and he knows, like me , that having researched andset-up for one then the following 4 rewinds are much easier. I use acoil-winder machine but little experience of these sorts of coils.No electrical data found on the net for these.As received by me, the secondary measured 22K ohm, now reads 6.3K , at thisstage, presumably shorted turns rather than a break for this one.He has some sort of technical data for these , when he can find it, butfirst thing is how to (after desolding) slide the laquered-in coil out ofthe central section between the 2 steel pole pieces marked S, and because ofthe boss marked P that holds the HT wire lead out, coil would have to beremoved from the other open section, underneath in pic. Anyone know thenumber of turns, wire gauge to save having to count off ? and details ofinterlayer insulation (if any). How is the HT coil output removed from theboss P or whereabouts is the join to a feedthrough under the output laquer?--Diverse Devices, Southampton, Englandelectronic hints and repair briefs , schematics/manuals list on

Apr 24, 2008 20 Replies

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kenney 18 years ago

I remember that in the 80s someone was supplying a self contained electronic ignition set that was a plug in replacement for a magneto. I do not now if that is still available but if it is I wold go for that.

Ken Young

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Lucas K2F magneto coil rewind

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