Looking in my 84-87 USA manual, the Orange wire to ground (earth) should read .3 ohm.
The secondary ( hi tension ) should read 4.3kohm to ground. Remember the spark plug cap has a resistor too, remove it and measure just the HT wire to ground.
Make sure the coil is unplugged from the CDI. The frame of the coil is ground. My 84 and 86 coil read a bit higher on the primary at .7 ohm and works fine.
I am not sure if the older coil reads the same as the newer ones. I think your e model may use the newer igniter and that may in turn require a different coil.
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