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Bofors (Enfield) genny

Enfield TS flat twin engine.

I took the ignition generator off today. Inside, is a single coil with condenser, all obviously bran new just as the chap I bought it from told me. However, there is no spark - nothing at all, even when I place my shrinking pinkie on the end of the lead.

I put a meter across the coil. It has continuity & isn't leaking to earth. The earth end was a little corroded - but no, no good came of it! The flywheel has little magnetism left & I think that is the root cause.

I dimly understand that one can run a double ended coil off a 12v battery via the existing points. I say dimly, because I've never attempted it, although I have a basic grasp of it.

Would some kind soul talk me through it off list as I'm supposed to be exhibiting it at the 1,000 engine rally & the days are trickling away .....

regards,

Kim Siddorn.

Reply to
Kim Siddorn
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For better or worse the mag on my Enfield has been gutted and an external

2cv coil fitted, wired exactly as it would be in the Citroen. I imagine the rewound Enfield coil could be used in the same way, though I don't think I'd chuck 12v at it without checking the primary resistance - kick off with just enough voltage to give a current of about 1 Amp (I=V/R) and see if you get a spark, tweak as necessary to obtain satisfactory spark with minimum current.

BTW. This may well finish off what little magnetism you have left in the rotor.

Reply to
Nick H

I've been doing a little scratching around with my old bike bits & have discovered that Honda CB250N HT coils are 12V double ended, delivering a waste spark on the exhaust stroke. I scratched around some more & found a condenser, flashed 12V across the end of the LT lead & Lo!, an HT spark. They *do* like to fire together, letting one dangle in space definitely reduces the strength of the spark on the other, so that's that problem solved. Deo volante - ie, if the weather's nice - I'll jury rig it tomorrow & see how I get on

They are probably not alone, certainly the CD175 is the same but 6V.

I had mulled over supplying the nice, shiny, rewound coil with a few externally supplied volts & thought the same about it being likely to be 6V. I don't have an easy access to 6V supply other than ganging some AA dry cells, so was brave & flashed 12V across the Enfield coil whilst I had it off yesterday.

Nothing. Not a flicker, even though it has continuity & is not shorting out. Very strange - perhaps it IS the coil then ........

regards,

Kim Siddorn.

Post hoc, ergo propter hoc!

Reply to
Kim Siddorn

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