1999 sea doo challenger will crank but not start

[Rich5kg]

I have a 1999 challenger that was running perfectly. Tied to the dock overnight and next day neither of the 2 motors will start. Will crank just fine but wont start. Have replaced battery. Filled up with gas. Just bought new mpem with key and still wont start. Also noticed no rpm on either tachometer while trying to start.any ideas on what else might affect both motors.

 

[Dr Honda]

Sounds like you did a bunch of peripheral stuff... but have you checked for spark? Have you checked the fuses? Have you pulled the spark plugs?