classic motorcycle forum

Motorcycle Discussions => British Bikes => Topic started by: bikerbob on March 03, 2010, 07:14:42 PM

Title: 12v DUAL COIL
Post by: bikerbob on March 03, 2010, 07:14:42 PM

Hi there
I have just purchased a 12V DUAL COIL for my 1963 BSA A65 which I am restoring and converting to 12V and PAZON electronic ignition my question is the spade terminals on the coil are not marked positive and negative but the wires supplied are yellow and black so does it matter which wires go on which terminal. THANKS

Title: Re: 12v DUAL COIL
Post by: Justin_Faithfull on March 03, 2010, 10:16:05 PM

If there are no markings at all on the coil terminals, then I don't think it would matter which way round they are connect. Where there no instructions with the coil? & what make is it?

Title: Re: 12v DUAL COIL
Post by: bikerbob on March 04, 2010, 01:56:52 PM

Thanks for the reply the only instructions that came with it were to mount it on a metal base so it can act as a heat sink the make is WAT YONG. Thanks. BOB.

Title: Re: 12v DUAL COIL
Post by: Justin_Faithfull on March 04, 2010, 10:52:47 PM

What a great name 'WAT YONG'. Never heard of it myself but obviously Chinese.

Title: Re: 12v DUAL COIL
Post by: Revband on March 10, 2010, 04:45:46 PM

Hi Bikerbob

A dual coil is not actually that it is in fact a double ended coil, the primary and secondary windings unlike a single coil are not linked, one spark plug is connected to each end of the secondary coil, both spark at the same time hence the expression wasted spark, as a result of this the primary coil is not polarity sensitive and can be connected either way round.

Title: Re: 12v DUAL COIL
Post by: bikerisme on March 15, 2010, 08:00:48 AM

hi, fitted a dual coil with a bransden ignition to my triumph all was well
eventually blew up the bransden unit then found out you couldnt use
one of these dual coils with the unit check you can use this coil with
your pazon first or do you have to run coils? i had to buy a new unit

Title: Re: 12v DUAL COIL
Post by: Revband on March 15, 2010, 09:17:54 AM

Hi bikerisme

The Boyer Bransden unit is designed to replace points ignition using the original coil/s.

The old style points ignition coil has a primary resistance of about 3 ohms and modern electronic ignition coils are about 1/2 ohm, any coils used with the Boyer must be the early 3 ohm type, these can be obtained in the double ended type, not sure if the same applies to the Pazon unit but the user instructions should be clear on this.