boyer failure?

Riding along at 30 mph and bike just cut out like a switch was pressed.
Still got ign warning light and enough power to flash indicators, blast horn and have good lights.
Checked for a spark and no spark with plugs out and resting on engine, whilst kicking bike over.
Bike has a pretty new boyer Mk111 system and a new battery.
Anybody any ideas?
Stuart.

Boyer trouble

Greetings,
As with any electrical trouble shooting first make sure your battery is up to par and connections are good. Next use a jumper wire from -NEG battery terminal (I asume that you are running +POS ground) straight to the boyer feed wire, by doing this you will completely eliminate ignition switch, kill switch, and bike wiring. If spark returns problem is in bike, if still no spark, problem is in Boyer system.

GB

Check the feed wire to the Boyer box. If no voltage with the key on then check the kill button at the handlebar. If this is a disc brake model, seepage from the master cylinder can cause corrosion at the kill button. Fix is to repair the master cylinder and clean the switch contacts.
If you have 12 volts at the Boyer box feed, then with the key on, push the kill button. You should get a spark at the plug. If not disconnect the wires at the stator. With the key on make and break connection between the two trigger wires. This should result in a spark. If not then the box is likely bad (or the coils which is not likely). If you get spark then it is likely the connections on the stator.

I'll bet one of the primary leads to one of the coils fell off or a connection on one of those wires broke.

DON'T ASK HOW I KNOW THIS.

Also check the bullet connections at the distributor pickup. Don't just look at them - wiggle 'em.

grandpaul said:

I'll bet one of the primary leads to one of the coils fell off or a connection on one of those wires broke.

DON'T ASK HOW I KNOW THIS.

Click to expand...

I have to agree as I had this happen a few times until I fixed the connector. Also the Boyer will only work if the battery is above 12V's. Do you have spark if the lights are turned off?

Urban myth. Boyer perfect down to 10.8V per Dyno Dave data.

bigstu said:

Riding along at 30 mph and bike just cut out like a switch was pressed.
Still got ign warning light and enough power to flash indicators, blast horn and have good lights.
Checked for a spark and no spark with plugs out and resting on engine, whilst kicking bike over.
Bike has a pretty new boyer Mk111 system and a new battery.
Anybody any ideas?
Stuart.

Click to expand...

for information to all, for future ref.
Turned out to be a duff coil, the first in the wiring sequence.
Stu.