Honda BF75 Cooling Problem

[bjarnold1]

I recently purchased a 1980's Honda BF75 7.5hp outboard and it will not spit a steady stream of water out. Nothing at idle except steam and a sputter and half throttle. So far I have done the following to try and correct the problem

Replace impeller
Clean water intake screen on lower unit
Clean impeller housing
Removed side cover and cleaned housing
Blew out water intake line

What else could it be?

 

[ovlo]

Re: Honda BF75 Cooling Problem

look at the thermostat. could be blocked. one of my evinrudes started getting hot there was a bunch of sand and small crap stuck all around it

 

[bjarnold1]

Re: Honda BF75 Cooling Problem

I removed the thermostat and it has some garbage around it. Would it damage the engine if I ran it without it?

 

[ovlo]

Re: Honda BF75 Cooling Problem

no it wont destroy your motor but it will run colder than it should fuel wont burn all the way with cooler combustion chamber and cylinder/ring wear will go up

 

[bjarnold1]

Re: Honda BF75 Cooling Problem

I cleaned the thermostat and now it spits water better at half throttle but still nada at idle

 

[Flounder pounder]

Re: Honda BF75 Cooling Problem

I always pull the pee-joint out of the cylinder wall. There always seems to be stuff trapped behind it.

 

[bjarnold1]

Re: Honda BF75 Cooling Problem

I found a flush adapter that was for a BF100 from years ago and after running the BF75 today it seemed to be running great!. It spits water out at idle and water comes out two holes on the lower unit.