Good evening. Just so I am sure that I understand, after the throttle cable splits, one of the cables running to one of the carbs broke. After the cable was replaced the sled would not run. However I am not sure that I understand what you are saying about the spark plugs.
When the new cable was installed did you adjust the slides so that they would come off the bottom at the same time?
Did you do anything else to the carburetors when you replaced the cables?
Which side had the broken cable and which side is not running?