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Honda BF250 coolant temp range??

Old 05-09-2020, 07:14 PM
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Default Honda BF250 coolant temp range??

Hello all, could someone tell me what the coolant temp reading for a Honda 250 should be? I'm referring to the coolant temp reading that is on my NMEA2000 gauge. After warmed up she idles at around 160F and when I run her btwn 4500-5000rpm the coolant temp goes up to around 209F. No alarms have gone off yet, but I haven't run her at this rpm for more than 30min yet this season. I should also note that she's pulling a full tank of fuel (150gal), though I'm not sure this should matter. Also the telltale is expelling tepid water not even warm, though to my understanding this doesn't tell me anything about the engine temp. I've called many mechanics literally on both coasts and gotten a range of answers which has just left me more confused than ever. Some say there shouldn't be this much fluctuation while others say this is perfectly normal for these outboards. This is a new world to me (ie the motor only has 12hrs on it), I've always run skiffs with 60hp tiller outboards. I'd be really grateful if someone familiar with Honda's could provide some imput
Many thanks. Dingo
Old 05-09-2020, 07:46 PM
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My BF250D runs at 190 degrees at 4400 rpm.
Old 05-09-2020, 08:03 PM
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I have the Tohatsu version of the same engine and I often see temperatures in the low 200s, I've had three or four high temperature alarms and I think that happens close to 220° , so the temperature doesn't rise very much from normal operating to alarm.
Gerald
Old 05-09-2020, 08:23 PM
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I have 2 bf150's about a year old, and I get similar results to what commuter boats gets. And I believe I've only seen about 3 high temp alarms. I do recall the dealer telling me that 200 was normal, but it always seems odd when it goes that high. I've also heard there's three temp sensors - which really only adds to my confusion! Maybe the number that gets sent over NMEA is towards the end of the exhaust, but I'm only guessing.
Old 05-09-2020, 09:10 PM
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Is there something on the display that says that it is coolant temperature?

I would think that engine temperature is being displayed.
Old 05-10-2020, 05:50 AM
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Yes on the digital part of the NMEA2000 gauge it says it is the engine coolant temp. Thank you all for your imput. I feel somewhat better given your experiences. Doesn't sound wildly out of the temp ranges your experiencing...
Old 05-10-2020, 06:29 AM
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My Tohatsu is the same as DocStressor, the thermostat is a 190 and that's what I run @ 4000 - 4500 sometimes touching 200. About 175 at idle.
Old 05-10-2020, 06:50 AM
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It depends on what temperature thermostat you have
Old 05-10-2020, 08:13 PM
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I believe all the newer Hondas 135 and up have 2 thermostats - a 140 and a 150 (or maybe it's 150 & 160).

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