I've no idea what 'to porpoise' means, I'm new to owning a Seadoo. I was asking about the conversion because I would like to know what it would to do it, is a kit available???. The Lake where I would like to take the boat has 2008 EPA rules applied, so Sea Doo Challenger with it s CARB engine is not allowed any more. But if I can get it running on a Fuel
Injected system I think I could fix any emission problem. I'm thinking replacing the Carb with Fuel Injection would be easier than replacing the complete engine.