Hi
A 79 would be a CDI unless someone put a later motor in it
( like me with my 82 Eurosport motor
)
To check the CDI coils primary resistance you need to first check the resistance of the
meter leads
To do this set the meter to the lowest resistance readings
short the leads together and note the reading
You may find its 1 ohm or less.
Now attach the probes to the yellow or pink LT wires and get a good contact
the centre slug
You may need to scratch down to bright metal to do this
the usual reading fo the LT coils is 0.8 of an ohm
an ohm or two should not matter.
Test the HT side by removing the cap and use range to read say 10K
usually its about 8K ohms between the centre slug and conductor.
While your at it test the plug caps
Original ones had resistors many of which have burnt out
You would expect to see about 5K ohms between the HT lead connector
and the plug top contacts.
If you get a dead short look up the hole where the plug goes
If you DO NOT see a slot for a screwdriver thats fine
Its a later non resistor type cap
OR
It may be an original cap that someone has had the resistor burn out
and replaced it with an alloy or brass rod
You can dismantle these to check if you wish
HTH
A 79 would be a CDI unless someone put a later motor in it
( like me with my 82 Eurosport motor

To check the CDI coils primary resistance you need to first check the resistance of the
meter leads
To do this set the meter to the lowest resistance readings
short the leads together and note the reading
You may find its 1 ohm or less.
Now attach the probes to the yellow or pink LT wires and get a good contact
the centre slug
You may need to scratch down to bright metal to do this
the usual reading fo the LT coils is 0.8 of an ohm
an ohm or two should not matter.
Test the HT side by removing the cap and use range to read say 10K
usually its about 8K ohms between the centre slug and conductor.
While your at it test the plug caps
Original ones had resistors many of which have burnt out
You would expect to see about 5K ohms between the HT lead connector
and the plug top contacts.
If you get a dead short look up the hole where the plug goes
If you DO NOT see a slot for a screwdriver thats fine
Its a later non resistor type cap
OR
It may be an original cap that someone has had the resistor burn out
and replaced it with an alloy or brass rod
You can dismantle these to check if you wish
HTH