Hey bobby,
So I did what you asked me and my spark is pretty big BUT I bought this bike about a week ago and i think that the guy actually changed the CDI and the rectifier so that might be a reason why my spark is good.
And I wanted to ask also, nobody has a zs250gs running ??? Mine has a minor electrical problem, sometime it seams like the batterie is dead so I have to push start it. I'm thinking that it's either the stator or just the cable is peeled somewhere I still don't know.