Following the arrival of 2 OEM coils, I went back to step one with a used mag plate, but am still getting no spark on the top cylinder..I did test my motor with a known good mag plate (that I don’t own) and it produced 2 good sparks.
So, as of today:-
– 2 new OEM coils – continuity / resistance is 4.65 & 4.77K OHms (between the block and the spark plug boot end)
– 2 new OEM condensers / capacitors (fresh out of the packet) – not sure how to test with a digital meter on OHms..if the top one is shot..I could swap them..
– 2 new spark plugs – Champion J4C set to .030 – bottom plug sparks with the plug I used to test No1 (holding the plug to earth on the head).
– 2 new HT leads I made up from new 7mm wire (continuity tested ok) old boots and tangs used
– 2 new sets of OEM points, set to .020 – clean (readings of 0.03K OHms normal closed, (+0.01 above reference reading) and 1.1K Ohms open, also normal readings)
– an old spare mag plate (spotlessly clean) used, with little lateral movement, lightly greased with 2-4-C where it should be. The reference plate is the pics of the green / yellow coil version.
– kill wiring isolated from the anti-pop and ignition circuit, with both of those hanging free (I fitted new ring terminals with heat shrink in order to ensure there’s no earthing)
Am unable to come up with anything further, or further tests I can try perhaps to find if there’s any earthing to ground, stray discharge?
