Pontoon Pat
Recruit
- Joined
- Sep 29, 2003
- Messages
- 3
I have a 1993 90hp Johnson on a 30ft Party Hut Pontoon boat that only seems to overheat at full throttle(4500 rpm). I can run this boat all day long at 3500 to 4000 rpm with no buzzer. With my infared gun I was getting readings anywhere from 190 to 210 on the sides & tops of cylinders. #1 being the hottest. I've changed the thermostats, put in a waterpump kit, and deflectors on the starboard side(1&3){210 degree side}. Now when I run full throttle the buzzer still sounds and my readings are down to 190-195 degrees. My dash gauge reads 20psi since replacing the pump. I'm at a loss. Any ideas out there?