Boyer Bransden ign.

[chrisx1]

Is it best to use twin 6 volt coils with the above. What are people's recommendations.

[Gup holland]

I thought it was the recommendation 30 years ago when I installed the Boyer ignition, it never let me down over all these years.
Better spark I believe?

Gr alex

[chrisx1]

How do you wire the coils?

[Spaceman]

The B-B Mk IV is designed to work with either a 12 V single or a 12 V twin and therefore requires the same coil resistance for both. This means the single can use a 12 V coil but the twin must use 2 x 6 V coils in series as shown. If you use 2 x 12 V in the latter (as per factory spec), you will end up with at most a weal spark.

[Gup holland]

This is my mk3 boyer, just for info. Read 4 in general data.

Gr alex

[Spaceman]

I guess it depends on what is meant by a low compression engine: 6:1 is low compression but is 8:1? As said, with 2 x 12 V coils, the higher series resistance will result in a much weaker spark which might be ok but using 2 x 6 V coils will give more certainty.