Ha the bastard won't start, there are apparently sparks and petrol and compression but it won't start. It coughs occasionally first kick, but nothing afterwards. I have checked much of the wiring, and did find a wire inverted on the coils which allowed me to get the lights working! But nothing conclusive, for some reason I thing the ignition is responsible somewhere, so have been looking at troubleshooting the Boyer Bransden ignition.
The BB ignition replaces the points with a back plate with two hall effect coils on it, a rotor with two magnets fixed to it is fixed to the crank shaft end, and this generates signals which go to the black box which fires both coils at the same time (wasted spark), although I get a spark at the plugs thought I would take a look anyway!
If you remove the black/white wire and the brown/white wire and rub them together you should see a spark at the plugs - check!
If you move a magnet across the coils you should excite them and generate a spark - check except I had to touch the coils with the magnet to get them to fire!
I used a screwdriver to test the magnets on the rotor, and there didn't seem to be any magnetic power at all, so I removed the stator plate and the rotor and effectively very little magnetic power from the magnets! Strange it says on the Boyer site that the magnets should just about support the rotor plate when lifter with steel, mine don't! Maybe this is giving a too weak signal to the hall effect coils and not generating a signal when at speed?
The price of spare parts for the ignition is ridiculous so I am going try re magnetizing the magnets...... we'll see.
The BB ignition replaces the points with a back plate with two hall effect coils on it, a rotor with two magnets fixed to it is fixed to the crank shaft end, and this generates signals which go to the black box which fires both coils at the same time (wasted spark), although I get a spark at the plugs thought I would take a look anyway!
If you remove the black/white wire and the brown/white wire and rub them together you should see a spark at the plugs - check!
If you move a magnet across the coils you should excite them and generate a spark - check except I had to touch the coils with the magnet to get them to fire!
I used a screwdriver to test the magnets on the rotor, and there didn't seem to be any magnetic power at all, so I removed the stator plate and the rotor and effectively very little magnetic power from the magnets! Strange it says on the Boyer site that the magnets should just about support the rotor plate when lifter with steel, mine don't! Maybe this is giving a too weak signal to the hall effect coils and not generating a signal when at speed?
The price of spare parts for the ignition is ridiculous so I am going try re magnetizing the magnets...... we'll see.
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| Removing the back plate gives access to the small rotor with the magnets screwed onto it. |
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