Need help with choosing a prop.

You know the drill..

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BARRACUDA1968
Posts: 8
Joined: Thu Feb 10, 2011 12:51 pm

Need help with choosing a prop.

#1 Post by BARRACUDA1968 » Thu Apr 05, 2018 9:20 am

I have a 2004 Misty Harbor 2585 GM and a 130HP 4 Stroke Honda. I want to buy a spare prop and I'm not sure if the prop I have is the proper size. It's an aluminum Honda prop 13.5x15

I went to the Honda sight to choose a prop based on my boat weight etc etc and it say's to use a 14x11

According to NADA my boat weighs 2320 dry and no motor??? Does that sound right for a 25 foot pontoon?

I figured 6 people in the boat at 180 each. 1080 pounds

24 gallons of fuel

I wish I could remember the rpm's I turn at WOT but it seemed low like under 4000 rpm if I remember right. My boat will do 24 mph with 6 people on it. I get great fuel consumption if I take it easy but when I run it over half throttle I get terrible fuel consumption. I want to maximize fuel due to not having enough places to fuel up on the water. I've almost run out a couple times.

What do you guy's think I should do? Hopefully I have given you enough information.

Thank you, Brett
2004 Misty Harbor 2585 GM
130 hp Honda 4 stroke
25" tubes

scott2165
Posts: 5
Joined: Mon Apr 02, 2018 6:37 pm

Re: Need help with choosing a prop.

#2 Post by scott2165 » Thu Apr 05, 2018 6:44 pm

Those numbers don’t sound right. Go test again under the regular load you normally carry.

You can expect 180-200 change in Rpm between prop sizes.

Go get an exact WOT reading and calculate from there. That boat should turn more rpm with a 15 I would think. Double check the numbers.

Bamaman
Posts: 3679
Joined: Fri May 06, 2011 1:44 pm
Location: NW Alabama--Tennessee River

Re: Need help with choosing a prop.

#3 Post by Bamaman » Fri Apr 06, 2018 6:47 am

Go out on your boat with a couple of people and 1/2 tank of fuel. Then take note of your speed (gps) and maximum rpms. Are you getting any prop ventilation in a tight turn?

Then com back on this forum with specifics.
'12 Bennington 24' SSLX Yamaha 150

willy13
Posts: 248
Joined: Sat Dec 22, 2012 8:23 am
Location: Canandaigua Lake in NY

Re: Need help with choosing a prop.

#4 Post by willy13 » Fri Apr 06, 2018 7:27 am

An aluminum 13.5x15 prop should be pretty close for that motor. You might want to confirm that your tach is working. I just cant see that motor not spinning it to at least 5000 rpms. You will want to be 5500 to 5800 I think.

Going with a 14" dia will help with ventilation if thats an issue.

BARRACUDA1968
Posts: 8
Joined: Thu Feb 10, 2011 12:51 pm

Re: Need help with choosing a prop.

#5 Post by BARRACUDA1968 » Mon Apr 09, 2018 1:00 pm

I'm going off memory but you're right I need to go back out and do the things mentioned. I will record tach and other info and report back. I'm in Iowa so we just had snow yesterday.
2004 Misty Harbor 2585 GM
130 hp Honda 4 stroke
25" tubes

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