Poppet valve

[Ron.64]

I have a 1984 200 merc and replaced the impeller earlier this year and noticed the water flow out of the tell tale was sputtering. I removed the thermostats and the water flow was very strong so, I don't think I have any blockage. I replaced the thermostats and ran the motor. Seemed flow a little better at idle. At speed I had a lot of water blowing out the exhaust with the water out of the tell tale getting hotter until the alarm went off. I've just ordered a poppet valve assuming that this is the culprit. Is there anything else I should look for or consider servicing?

Thanks,
Ron

[PanRonnie]

sealant rubbers from the water tube in your midsection
one in your adapter plate and the one in your impeller housing(gearcase)
maybe something went wrong with assembling