Suzuki 70hp Overheats at Full Throttle

[snowtrax00]

The boat has 200 hours on it now (it's a 2005 but wasn't put into service until 2008). It's always been serviced and it has the correct prop on it. When I go full throttle for about a minute all of the idiot lights come on - rev, temp. and it goes into limp mode. I've read about someone else having the same problem and the consensus was that the rpm gauge was off which I think is incorrect. It redlines at about 5200rpm which is perfectly safe and the impeller is new. Any suggestions? This will be my last Suzuki.

 

[robert graham]

Re: Suzuki 70hp Overheats at Full Throttle

Maybe inspect/clean/replace thermostat and pressure control valve, which can get sticky due to mineral/corrosion deposits, causing overheating. Probably should inspect these when doing the new water pump impeller. Good Luck!

 

[99yam40]

Re: Suzuki 70hp Overheats at Full Throttle

Need to check to see what is setting off the alarm, I believe some Suzuki's have water level switches along with overtemp and oil flow switch.
But not sure what sets of the rev you listed

 

[Rancherlee]

Re: Suzuki 70hp Overheats at Full Throttle

5200 isn't ok, it's at the very bottom of the 5200-5800 window and this particular engine like to be at or above 5800 with a light load WOT. Besides being easier on the engine it will perform A LOT better, trust me. Mines a 98' and has 1500+ trouble free hours. And like others said, toss a new thermostat in it, couldn't hurt.