Modern 4-stroke jet skis use o2 sensors?

[Joeggernaut]

Do they run open or closed loop sensor when it comes to tunes? Do they mount the o2 in the manifold before it becomes wet? What about the turbo/supercharged skis, they run 02 sensor also?

 

[restosud]

sxr 1500 has no o2 sensor.

 

[newbee]

I ran one on my supercharged Sea-Doo just to double check the tune

 

[Harbor]

I don't know the answer. But if they don't have a catalytic converter that needs varying waves of oxygen there would be almost no need. They can use map, baro, rpm, intake air temp and tps and the fuel cell map to determine fuel requirements.

 

[restosud]

I don't know the answer. But if they don't have a catalytic converter that needs varying waves of oxygen there would be almost no need. They can use map, baro, rpm, intake air temp and tps and the fuel cell map to determine fuel requirements.

true but going closed loop allows for finer real world tuning instead of relying on a map that was established on a dyno somewhere.
that said,motorized vehicles have run just fine using canned maps.