97 gtx no spark

This Ski (97 GTX) is causing me to loose my mind. Had early issue with carb which thanks to this forum I was able to solve (pop-off pressure wrong after rebuilding card) but that was corrected. Ski ran fine for one nice long ride on the lake the next morning she would crank but not turn over...

I have a 97 gtx with 75 hrs, im having trouble getting it staryed this year. I changed the battery and cranks very slow, repleced the batt again and realized im not getting any spark. Anyone know what i should do? Another strange fact is that it cranks great without the plugs in!