Author Topic: boyer ignition  (Read 570 times)

cb brightman

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boyer ignition
« on: October 10, 2020, 07:52:47 PM »
Does anyone know what coloured wire  skitsu I require for a single cylinder Boyer ignition running off the cam shaft ?

Spen

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Re: boyer ignition
« Reply #1 on: October 10, 2020, 08:16:55 PM »
 

 
White   1 spark per 2 revs                   ( e.g. single 4 stroke )
Red   1 spark per rev                        ( e.g. single 2 stroke )
Blue   2 sparks per rev                      (e.g. 4 cylinder 4 stroke )
Green             3 sparks per rev                      (e.g. 3 cylinder 2 stroke )
Orange   3 sparks per 2 revs                 (4 stroke triple)
Brown   1 spark per rev (uneven)         (Some V twins e.g 45 degree crank)
Yellow   1 spark per 2 revs                  (Magneto 4 stroke single)
Black   1 spark per rev                      (Magneto 4 stroke twin)












Spen

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Re: boyer ignition
« Reply #2 on: October 10, 2020, 08:17:57 PM »

Here's an example:
4 Stroke
4 Cylinder
2 Twin ignition coils, triggered from 2 pickups on crankshaft.
The crankshaft has 2 pickups, so it must be making the ignition fire twice every rev of the bike , so in this case a blue code would be selected.

Here's another example:
4 Stroke
1 Cylinder
1 ignition coils, triggered from 1 pickup on crankshaft.
The crankshaft has 1 pickup, so it must be making the ignition fire once every rev of the bike , so in this case a red code would be selected.

Last example:
4 Stroke
1 Cylinder
1 ignition coil, triggered from 1 pickup on the camshaft.
The camshaft has 1 pickup, so it must be making the ignition fire once every other rev of the bike , so in this case a white code would be selected.


On a V engine, where one head is well away from the other, you can work out how many sparks per rev is produced for one side only.

New BTH magneto's using an external coil should be treated as a standard ignition. Only use a magneto tacho for magnetos using points.