Honda BF15A stops pumping at hi RPM

M

Mercury13

Seaman Apprentice
Joined
Apr 14, 2009
Messages
35
The '97 4 stroke motor is very clean and I've never seen this. It pumps great at idle and low RPM but stops completely in the high end. All water pumping items were new over winter- impeller, housing, plate, thermostat, gaskets ... Up until yesterday water shot VERY strong at hi rpms. Ran a wire up the chute but didn't help.
As soon as you cut back on throttle water appears fairly strong again.
I'll appreciate any ideas on this at all.
Thanks.

Steve
 
pvanv

pvanv

Admiral
Joined
Apr 20, 2008
Messages
6,511
Re: Honda BF15A stops pumping at hi RPM

Could be a bit of debris in the cooling system that jams into place at higher water system pressures. You could try using compressed air to blow it back out, but you would likely have to drop the LU to get the pump out of the way to eject the debris -- otherwise it may stay "captured" in the cooling system.
 
M

Mercury13

Seaman Apprentice
Joined
Apr 14, 2009
Messages
35
Re: Honda BF15A stops pumping at hi RPM

Thanks. That is one of the few "theories" that could account for it acting this way. Will do this evening.

Steve
 
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