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honda bfp20 prop nut

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woodyjoe

New member
Hello to all. I'm anxiously awaiting the ups man to deliver my new prop for my pontoon that I'm trying to get better performance from. My question is can anyone tell me what size the prop nut is. Boat is at the marina so I want to take right socket with me. Will probably have to go buy socket at socket store in different town in opposite direction. Motor is a 2004 honda bfp20.
 
You won't need a socket. The nut doesn't need to be very tight at all. A "Crescent" (adjustable) wrench works well here. Snug it "softly" then back it up to line up the nearest slot to the cotter pin hole. The rule of thumb with these is it's better to run it a little loose than too tight.

But, if you're doing it "by the book" and using a torque wrench, it's a 10mm nut so you will need a 14mm socket. A 9/16" socket should work too.

Torque spec: 1·Nm....(0.1 kgf·m) or 0.7 lb. ft. (approximately 9 lb. in.)

As you can see....not tight at all.

Good luck.
 
Woodyjoe,......You're welcome!
I Hope you have a good outing with your new prop! We're all here to learn so please let us know what it took to make your 'toon better. Brand, size, pitch and maybe a 1 to 10 "happiness" scale ;>)
Cheers!
 
jgmo said:
Woodyjoe,......You're welcome!
I Hope you have a good outing with your new prop! We're all here to learn so please let us know what it took to make your 'toon better. Brand, size, pitch and maybe a 1 to 10 "happiness" scale ;>)
Cheers!
Click to expand...

I will. I may do it with a different thread unless I can edit title of this one.

My objective is to get my rpms at wot into the correct range. My motor calls for 5000-6000 at wot and I am only getting 4100. After some research I have determined it may have the wrong prop on it. It has a 9.25 x 10 which is standard for the bf20 honda. My motor is the bfp20 which is the optional power thrust version. The standard prop for that motor is a 10 x 7 power thrust prop. Not sure why the wrong prop is on it because I didn't buy pontoon new.
 
Yes, the shallower pitch should bring the rpms up.
Maybe the previous owner was really loading it down or constantly fighting a head current and wanted more torque. I'm no prop performance xpert so really interested in what results you get.
Happy boating!
 
I started a new thread with results.

jgmo said:
Yes, the shallower pitch should bring the rpms up.
Maybe the previous owner was really loading it down or constantly fighting a head current and wanted more torque. I'm no prop performance xpert so really interested in what results you get.
Happy boating!
Click to expand...
 
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