No Spark

BrianG · Sep 17, 2017

And so it begins. I just love this part..
There is no spark, but the lights work (mostly). And I have to install signal lights...

Triton Thrasher · Sep 17, 2017

The HT lead is not attached to the spark plug.

BrianG · Sep 17, 2017

Triton Thrasher said:
The HT lead is not attached to the spark plug.

Hahaha.. good catch. It is not attached to THAT sparkplug. It is attached to one sitting on the head fins where I can see the electrodes.

So, there is power to the white lead of the Boyer and at all 4 of the coil connectors. (the last one, if you uplug the gnd wire.)

There is no spark when the ign is switched on, nor when the kill switch is toggled.

There IS spark when the ign is switched on, and when the kill switch is toggled if the pick-up plate is disconnected.

Is pick-up plate failure a known issue?

Ispick-up plate available separately?

BrianG · Sep 17, 2017

Can anyone identify this Boyer unit as to model?

baz · Sep 17, 2017

BrianG said:
Can anyone identify this Boyer unit as to model?

It's an earlier type unit if the pick-up is anything to go by, the pick-up you have there is the best type with the screw on terminals,the later ones had bullet connectors and were more troublesome

L.A.B. · Sep 18, 2017

BrianG said:
Can anyone identify this Boyer unit as to model?

Is pick-up plate available separately?

I think it's an old MkII Boyer which must be about 40 years old so, I suggest you spend the money on a new electronic ignition rather than a new pickup.

BrianG said:
So, there is power to the white lead of the Boyer and at all 4 of the coil connectors. (the last one, if you uplug the gnd wire.)

The only power reaching the coils should only be from the Boyer box black (as I doubt the MkII Boyer wiring would be different to later Boyer ignitions).

BrianG said:
Is pick-up plate failure a known issue?

It can be, but more likely to be a broken wire or bad connection.

baz · Sep 18, 2017

Doubt if you're pickup has failed,it's usually the igniter,but make absolutely certain of the connections before condemning the igniter,if you intend to stay with a Boyer ignition my advice would be to buy a complete new Boyer kit,and stick with the original pickup

BrianG · Sep 18, 2017

There is lots of spark when the key is turned on, and when the kill switch is activated, as it should, only if the trigger coil plate is disconnected. That tells me that the box is working.

Boyer sent me the trouble shooting process. The result is:
The stator plate resistance measures only 65.5 ohms.

This suggests that one of the coils is shorted as that should be the measurement from either of the coils and should be ~140 ohms at the contact points.

baz · Sep 19, 2017

BrianG said:
There is lots of spark when the key is turned on, and when the kill switch is activated, as it should, only if the trigger coil plate is disconnected. That tells me that the box is working.

Boyer sent me the trouble shooting process. The result is:
The stator plate resistance measures only 65.5 ohms.

This suggests that one of the coils is shorted as that should be the measurement from either of the coils and should be ~140 ohms at the contact points.

That does change things , keep us posted with your findings

BrianG · Sep 19, 2017

Boyer says that these older units should measure 65 ohms across both pick-up coils.

There is lots of spark when the key is turned on, and when the kill switch is activated, as it should, if the trigger coil plate is disconnected. That tells me that the box is working.

I am at a loss....

Mr. Rick · Sep 20, 2017

I seem to recall somebody saying that the Boyer will "time out" if the ignition is keyed on too long without starting.
I don't know if this is true, or even if my memory is any good, but now I do a quick off and on again if the bike doesn't start right away.

L.A.B. · Sep 20, 2017

Mr. Rick said:
I seem to recall somebody saying that the Boyer will "time out" if the ignition is keyed on too long without starting.

It switches 'on' again when it gets a pulse from the pickup or when the two pickup wires are touched together.

http://www.boyerbransden.com/faultfinding.html

.......The Micro-MKIII, Micro-Digital and Micro-Power units all turn off when not being triggered, therefore it is best to carry out the next test as you may not always have a spark on turning on and off.

I Have Sparks On Switching On And Off But Not On Cranking

Disconnect the wires from the ignition box that go to the stator plate. With the ignition on, touch these two wires together, making and breaking should produce a spark at the spark plugs........

baz · Sep 20, 2017

My memory is not what it was but I once worked on a mk3 commando that when the Boyer rotor was fitted the magnets were too far recessed to activate the pick up coils,I think it was to do with the camshaft bush or pattern camshaft really can't remember, have you tried passing a magnet across the pick ups? This should make it spark

o0norton0o · Sep 20, 2017

Test your battery for proper voltage. A bad cell in your battery can effect the boyer.

Straight off of Old Britts website;

If you get a shower of sparks at the plug when the key is on, check your battery for a bad cell.
If you get a shower of sparks at the plug when you depress the kill button, check for a broken wire in the points compartment.

baz · Sep 24, 2017

Did you get anywhere with this?

No Spark

BrianG

Triton Thrasher

BrianG

BrianG

baz

L.A.B.

Moderator

baz

BrianG

baz

BrianG

Mr. Rick

L.A.B.

Moderator

baz

o0norton0o

baz

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