Bought this waverunner from a guy and it will only run 35 mph top end. Dealer said either the carbs needed overhaul or the catalytic converter was bad but didn't know which (either way it was $1200 for the carbs or $1200 for the cat.). It started to clear out a little late last year and run a little faster (47 mph) so I was thinking carburetors. I decided to run some Seafoam through it and hopefully clean the carbs out. I took it out today and received an alarm indicating "Exhaust". May I now assume the catalytic converter is bad?