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Honda BF250A Temperatures

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tbbeard

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I have done a bunch of searching all over the internet forums and I was hoping to get solid confirmation that will ease my mine that the temps Im getting are normal for my engine.
I have a new to me 2016 Honda BF250A with 1100 hours. Bought it from the original owner who had all the maintenance records. He had it serviced by a Honda certified mechanic at the end of every year. He said he never had any overheating issues and there is no mention of it in the service reports. Thermostats and Impeller were being changed at the recommended intervals. It was due so I replaced the thermostats and did a complete rebuild of the waterpump(not just a impeller). It seems to be pumping great.
It has the nmea 2000 system so its reading block temperature not water temperature.
The boat has always been run in Marylands Chesapeake Bay so its not a super salty environment and there were no signs of excessive corrosion,
@ 6 MPH 174F
@ 4200 212F
@ 4800 221F
@ WOT 5250 228F

Thank you in advance for your feedback.
 
Temperatures seem fine until WOT. All of the EFI Honda's should alarm between 107-110 degrees C [224.6 to 230 degrees F] So, if you really are hitting 228F at WOT, then you are right on the edge of getting an alarm and shutting down.

If WOT is only 5250 RPM, I suspect that you are over-propped. WOT should be 6000 RPM +/- 200. Play with your trim to see where you max out RPM's. If still under 5600, consider downsizing your prop diameter or pitch. That would also likely allow you to run a bit cooler.
 
chawk_man said:
Temperatures seem fine until WOT. All of the EFI Honda's should alarm between 107-110 degrees C [224.6 to 230 degrees F] So, if you really are hitting 228F at WOT, then you are right on the edge of getting an alarm and shutting down.

If WOT is only 5250 RPM, I suspect that you are over-propped. WOT should be 6000 RPM +/- 200. Play with your trim to see where you max out RPM's. If still under 5600, consider downsizing your prop diameter or pitch. That would also likely allow you to run a bit cooler.
Click to expand...
Thank you. So here is my question. Where is the alarm system getting the temperature reading from? The only thing Im reading is a temperature being sent by the nmea system which is block temperature. It looks like there are temperature sending units at the top of each exhaust manifold that are actually in the water jackets. My suspicion is th nmea system has nothing to do with the alarm system and the actual temperature may be different then the block temperature.

If I have a Honda dealer hook a computer to it will it show them what temperatures its been running at?
 
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