I’ve sent my cdi over too a company in Holland to repair.
They will have do a diagnostic on it and repair it needed

Wanted CDI for my xtz750 super tenere 1989 model

Just tried the cdi with a separate 12v supply.
Same result
Good sparks until I screw the plugs in
Has anyone got a spare cdi???

Sorry I miss-led you
I have only tried it with the coil and not the cdi
Will try it tomorrow

I’ve already done this and still lost the spark

I’ve done a couple of videos but don’t know how to put them on here?????
Up date
I have done some more testing:-
Voltage at coil when switched on only 13.1v
Voltage at coil when turning over with no plugs in 10.5v
Voltage at coil when turning over with plugs in 11.3v

Voltage at CDI when switched on ...

Hi Again
Up date
ive tested the kill switch
side stand switch
clutch switch
and all work as they should.
ive added a extra earth lead to the coil and tried another coil and get the same results.
A good spark from the leads to the engine casings at a gap of about 10mm with the caps off(bare leads ...

Battery is good
Drops to 11.5v when cranking with the plugs in.

Hi
If I put tester on the battery when turning it over will this tell me the voltage? Or is there something else I need to do?

Hi
Both your first two points are what is happening.
The third point not too sure we are on the same wave length.
Let me try again to explain.
With no plugs screwed in i get sparks from both leads whether it is just the end of the leads or with the plug fitted.
Then once i screw some spare plugs ...