2001 Seadoo GTX won't start

I have a 2001 GTX with about 60 hours on it. While I was riding last week noticed about a 300 rpm drop in top speed. It would accelerate to 6450 then drop to 6150. After about 4 trys to get it to hold 6450 it just quit running.
The engine turns over fine has good compression and all fuses are OK. The only thing I noticed was a little corrosion on the negative terminal. I get the correct confimation beeps when installing the key lanyard. Not sure what to check next? Oil is full and fuel filter clean. doesn't seem to be getting spark. Any help or ideas would be greatly appreciated.
Thanks