MZ/MuZ Riders

Hi guys. Lost me spark on a Skorpion Sport @ 50 000 miles. Well it's intermittent and weak enough to be regarded lost. I've got power to the coil but unsure of the resistance readings.

I have 18.9 Ohms primary and 19000 secondary. Does that mean it's knackered?
Also does anyone know the serial number of the coil? All I know is its a Denso.

Thanks in advance.

From the XTZ660 manual...

Primary resistance 3.4 - 4.6 Ohms at 20 degrees C
Secondary resistance 10.4K - 15.6K Ohms at 20 degrees C

Plug cap 10K Ohms at 20 degrees C. Presumably that's with a functioning 5 Ohm resistor installed.
Seems both the SZR660 and XTZ660 use the same coil as the MZ660's. The SZR660 plug cap fits but I haven't confirmed that of the XTZ.