hi
The spark on the electronic ignitions are weak anyway and do not usually give any trouble.
i would suggest the problem may be something else.
if you'r local to canada heights i could have a look at it [stevens trials] i have fitted many of these in the past and worked on quite a few bultaco's.
regards Shavey.
Hi
you need to take a look at the waterpump shaft, any marks / scores where the seal has been running and this will let coolant through.
replace this and the seal and put in fresh coolant. not water.
cheers.
Shavey.