Dt140 cooling issues

[Dizzale]

I have a 1999 Dt140 that is having cooling problems. It runs perfect and pees water perfect at idle but when throttling up under load it stops peeing water. I replaced water pump kit and thermostat but still does the same thing. Any help is appreciated, thanks.

[boats.net]

Check your poppet valve.

[Dizzale]

poppet valve

Could anyone tell me where the poppet valve is located on the dt140 engine?

[boats.net]

looks like it is located beneath the cylinder or bottom of the cylinder head. Consult a service manual for the proper removal and installation of the valve.