"Normal" engine coolant temperature? HONDA BF150 (2016)

[CajunCoach23]

Hi all,

I have a 2016 Coach 23C tri-toon with Honda BF150 (just one year old and 21 total operating hours). I was out boating yesterday and noticed when wide open throttle, my NMEA coolant temp was up to around 205 degrees F. When I stopped and idled, it was around 168 degrees F. Are these normal temps? They seem high. I didn't receive any alarms, but just concerned.

[Bryden24shp]

I've never owned a Honda, but it sounds normal to me. Both my Verado and Yamaha did exactly the same thing. The T-stats opened up at 195 on the Verado and cycled open-closed. Temp always ran about 200 when running hard. Then dropped down at idle, until the T-stats closed. I would check with a Honda dealer, just to confirm this is how it should be on yours.

[DWRAT]

My Mercury runs around 136 on my smart craft gauge unless theres weeds on the lower unit, then it goes up to around 160-170..
It once hit 203 on the hose and my hot alarm sounded.
I would keep checking....

[CajunCoach23]

Thanks everyone for the replies. I checked with dealer and they said it was normal for the temps to be in this range.

[rancherlee]

seems a bit high to me, My DF140 idles ~160*f and hits the mid 180's max on long WOT runs. With straight water it will start to turn to steam at 212*f which would create air pockets (BAD). If it is truly 205* you don't have much of a safety barrier. Just about every outboard I've owned has around a 170-180* thermostat. With an unlimited supply of cooling water from the lake shouldn't run much more than ~5* above the thermostat unless you have a bad water pump, bad thermostat, or blockage of some kind. Another possibility is the engine is mounted too high and your sucking some air at higher speeds.

[ron nh]

[quote="CajunCoach23"]Thanks everyone for the replies. I checked with dealer and they said it was normal for the temps to be in this range.[/quote]
I'm sure you know this, but That would be the last people I'd listen to.