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1976 CB550F1 (what have I let myself in for) Project
eight0:
Right so I've just done as suggested and it does spark from the wire that would normally go to the ignition.
What's weird is that the light I'm using for timing is now always on.
Using a multimeter between the wire that would normally go to the ignition and ground, there is 12v. Is that right?
Bryanj:
If you mean the yellow or blue wire to the points yes
eight0:
I just realised my stupidity asking, of course it wouldnt spark against ground otherwise.
Bryanj:
If this is a 500/550 you can check oil feed to the top end by removing the polished end caps on the cam cover and loosening the bolts holding the steel brackets on, oil should flood out of there which is why the washer between bracket and cam cover should be soft alloy
K2-K6:
It will spark from that wire as it's taking a load from the coil, but you need to look at the spark plug while doing it as it should throw out a spark when you detach the earth with that wire.
Yes to measuring that wire with a voltmeter. The power is going into the coil from ignition source and you are measuring it across to ground just like putting the meter across the battery terminals.
Anyway, it does look like coils and their supply are working as it wouldn't do as you've described.
What "should" happen when connected to ignition triggering is that the triggering should be switching that earth route on and off to get the coils to spark. As it's not, then that suggests the triggering is not working for some reason.
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