Since you have 2-same skis, pull the "coil" where the plug wires go to, and switch it to other ski, thus, eliminating a bad coil. Unless one of the SPX has 717, then that wont work.
try this first i have had good luck with this put your lanyard in the ski and get everything to come on and pull it off hit the start botton 5 times till you get the beep put the key back in and hit the start botton once don't start the ski just get the beep if it beeps check out the codes below next remove your lanyard from ski and put it back on and try starting. If it doesnt start try the the steps over again and see if it comes up with another error code beep or beeps. The process will take all of 2 minutes and it will let you know if something isnt quite right on your ski.
DESS Codes/ Beeps
2 Short beeps …the engine is ready to start
1 Long beep …no communication to MPEM
4 Short beeps… (on Jet Boats) Shifter is in gear
8 Short beeps…defective MPEM
1 Continual beep…engine over heating"
