Weak Spark Issue!

1990 sj 650 bone stock. Took out for first run of the season and was running like it was on a rev limiter but at very low rpm. (1500 rpm ish) Eventually stopped running. Checked for spark and am getting very weak Spark. I cut back plug wiresand no change. I tried new plugs, I tried a coil out of a running ski.any help would be greatly appreciated. THANKS GUYS!
 
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