2016 ar190 smoking out the exhaust

[cc580]

I have a 2016 Yamaha ar190 that has had grey smoke that comes out the exhaust a few times. it happened when I was towing a tube at maybe 3/4 throttle. I felt a slight hesitation then I saw the smoke coming out of the exhaust. I shut off the motor and it was rough starting. when it started the smoke stopped. I added a quart of oil and changed the spark plugs and it ran fine for a few hours then the same thing happened again. anyone have any ideas on the cause? I'm a jet ski 2 stroke guy and don't have a bunch of experience with 4 stroke ski motors. I would guess it is burning oil but seems funny it starts and stops. do these engines have PVC valves that could put oil in the engine?

 

[2kwik4u]

I have a 2016 Yamaha ar190 that has had grey smoke that comes out the exhaust a few times. it happened when I was towing a tube at maybe 3/4 throttle. I felt a slight hesitation then I saw the smoke coming out of the exhaust. I shut off the motor and it was rough starting. when it started the smoke stopped. I added a quart of oil and changed the spark plugs and it ran fine for a few hours then the same thing happened again. anyone have any ideas on the cause? I'm a jet ski 2 stroke guy and don't have a bunch of experience with 4 stroke ski motors. I would guess it is burning oil but seems funny it starts and stops. do these engines have PVC valves that could put oil in the engine?

It's not smoke, it's steam. My 2017 does it all the time. In particular after a long time on plane, or after pulling a tube for awhile.

 

[cc580]

this is my ninth season using the boat and it hasn't done that until this year and I have done lots of tubing in previous years considering I have almost 400 hrs on the motor

 

[cc580]

also where would the water be coming in from its not like a head gasket would open and close

 

[2kwik4u]

also where would the water be coming in from its not like a head gasket would open and close

Exhaust is out of the water while on plane. Coming off plane exposes previously hot parts to water.

I think I'm a little over 400hrs now as well (I should check), done it since season 1 on mine

 

[cc580]

maybe i wasn't clear on how much smoke is coming out of the boat. it is lots of smoke to the point people on the boat where asking if it was on fire. also the smoke started when I was on plane

 

[2kwik4u]

maybe i wasn't clear on how much smoke is coming out of the boat. it is lots of smoke to the point people on the boat where asking if it was on fire. also the smoke started when I was on plane

Ok, that excessive for certain. I get a puff out from near the swim platform/ water line from time to time.

Is the exhaust port oily at all?