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Cracked! - Need a lower unit for Honda BF40 (1997)
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Wood Zeppelin



Joined: 09 Feb 2016
Posts: 312
City/Region: Seattle
State or Province: WA
C-Dory Year: 1997
C-Dory Model: 22 Angler
Vessel Name: C-Creature
Photos: Childhood Dream
PostPosted: Fri Nov 24, 2023 6:47 pm    Post subject: Reply with quote

thataway wrote:
You can get a parts diagram for your motor by google. That will tell about the bolts.

You will most likely have to go to salvage yards or E bay to find the "used but in good shape" lower unit. You should always do a run out dial caliper on one of these to assure that the prop shaft is not damaged. If it is out of true, send it back.


Yes, thanks for that reminder!

About the "bolts", let me refine my question... what I am wondering is: if there is an updated design on later models that replaces the internally threaded bearing retainer nut (with two bolts).. Because if so, I'd want to get one of those lower units? Anyone know?

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James Salay - Real Estate Broker / Investor, Engineer, Artist, Fisherman, Canyoneer, Outdoor Enthusiast






Current boats:

1997 22' Angler - "C-Creature"
1988 16' Angler - "E-fishn-C" (Project boat)
1997 16' Cruiser - "Wet-a-Net"

Also:
14.5' Drift Boat - "Wood Zeppelin"
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Wood Zeppelin



Joined: 09 Feb 2016
Posts: 312
City/Region: Seattle
State or Province: WA
C-Dory Year: 1997
C-Dory Model: 22 Angler
Vessel Name: C-Creature
Photos: Childhood Dream
PostPosted: Fri Nov 24, 2023 6:52 pm    Post subject: Reply with quote

For example, here is a diagram of one with the two bolts. But I don't know:

(a) what year did the design change
(b) Are these two-bolt models a bolt-on for my motor (1998)
(c) What does the "D" in BF40D stand for?


https://yumbo-jp.com/en/catalog/outboard/honda/0/BF40D+LRTA/43536/PROPELLER+SHAFT.html
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ssobol



Joined: 27 Oct 2012
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City/Region: SW Michigan
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PostPosted: Sat Nov 25, 2023 11:14 am    Post subject: Reply with quote

Wood Zeppelin wrote:
...
(c) What does the "D" in BF40D stand for?

...l


"D" models are fuel injected.
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Hunkydory



Joined: 28 Mar 2005
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City/Region: Cokeville, Wyoming
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C-Dory Year: 2000
C-Dory Model: 22 Cruiser
Vessel Name: Hunkydory
Photos: Hunkydory-Jay-and-Jolee
PostPosted: Sat Nov 25, 2023 12:02 pm    Post subject: Reply with quote

Wood Zeppelin wrote:
For example, here is a diagram of one with the two bolts. But I don't know:

(a) what year did the design change
(b) Are these two-bolt models a bolt-on for my motor (1998)
(c) What does the "D" in BF40D stand for?


https://yumbo-jp.com/en/catalog/outboard/honda/0/BF40D+LRTA/43536/PROPELLER+SHAFT.html




The design changes occurred in 2008 & the new design with the o-ring & 2 bolts vs the screw into case will not fit the older ones such as you have. Mainly the shifter connection using a smooth rod in the pre 2008 with a splined shaft shifter in the 2008 & up prevents the interchange. There could also be other changes made that could prevent it.

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Wood Zeppelin



Joined: 09 Feb 2016
Posts: 312
City/Region: Seattle
State or Province: WA
C-Dory Year: 1997
C-Dory Model: 22 Angler
Vessel Name: C-Creature
Photos: Childhood Dream
PostPosted: Thu Nov 30, 2023 12:49 pm    Post subject: Reply with quote

Ah, thanks... Good to know. That leaves me thinking my best options are:

(1) reconditioned or new
(2) a used one (preferably closer to 2008)
(3) a used one from freshwater
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Wood Zeppelin



Joined: 09 Feb 2016
Posts: 312
City/Region: Seattle
State or Province: WA
C-Dory Year: 1997
C-Dory Model: 22 Angler
Vessel Name: C-Creature
Photos: Childhood Dream
PostPosted: Wed Feb 07, 2024 2:24 pm    Post subject: Reply with quote

srbaum wrote:
WZ,
Give a call to Atlantic Marine, they are wonderful people and truly Honda outboard experts. They specialize in selling and installing Honda's to the military, as well as to commercial and recreational boaters. They are also the go-to for rebuilt or new lower units.
www.atlanticmarineva.com


Thank you. I called them and they were significantly more helpful that some of the local dealers in my area! I would also highly recommend them!
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Wood Zeppelin



Joined: 09 Feb 2016
Posts: 312
City/Region: Seattle
State or Province: WA
C-Dory Year: 1997
C-Dory Model: 22 Angler
Vessel Name: C-Creature
Photos: Childhood Dream
PostPosted: Wed Feb 07, 2024 2:29 pm    Post subject: Reply with quote

Hunkydory wrote:
Wood Zeppelin wrote:
For example, here is a diagram of one with the two bolts. But I don't know:

(a) what year did the design change
(b) Are these two-bolt models a bolt-on for my motor (1998)
(c) What does the "D" in BF40D stand for?


https://yumbo-jp.com/en/catalog/outboard/honda/0/BF40D+LRTA/43536/PROPELLER+SHAFT.html




The design changes occurred in 2008 & the new design with the o-ring & 2 bolts vs the screw into case will not fit the older ones such as you have. Mainly the shifter connection using a smooth rod in the pre 2008 with a splined shaft shifter in the 2008 & up prevents the interchange. There could also be other changes made that could prevent it.


Hi HunkyDory,

The guys at Atlantic Marine confirmed that these design changes preventing them from fitting the older motors happened in 2008, but they said the fitment changes were on the BF75's 90's, 115's... But NOT on the BF40's and BF50's. They said they swap newer units onto older 40/50 motors quite often. Is it possible you were referring to these larger motors? I want to double check because once I order a new unit I don't think I can send it back..!
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Hunkydory



Joined: 28 Mar 2005
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City/Region: Cokeville, Wyoming
State or Province: WY
C-Dory Year: 2000
C-Dory Model: 22 Cruiser
Vessel Name: Hunkydory
Photos: Hunkydory-Jay-and-Jolee
PostPosted: Wed Feb 07, 2024 4:46 pm    Post subject: Reply with quote

James, I apologize for giving you incorrect information, as it’s worse than none. After rechecking back through this today it does appear your information from Atlantic Marine is correct & the changes weren’t relevant to the Honda 40 & 50. Either, I made the wrong interpretation of information I read or what I read was wrong, when doing my parts research for the water pump exchange on my replacement Honda 60’s, following doing the same on the previous old Honda 40’s.

Jay
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Wood Zeppelin



Joined: 09 Feb 2016
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City/Region: Seattle
State or Province: WA
C-Dory Year: 1997
C-Dory Model: 22 Angler
Vessel Name: C-Creature
Photos: Childhood Dream
PostPosted: Wed Feb 07, 2024 5:38 pm    Post subject: Reply with quote

Jay,

Thank you. As it turns out, you've helped.. because if you hadn't replied to my post in the first place, I would not have asked this question to the guys at Atlantic Marine. So by putting our heads together here on the board and contributing from our experiences, we eventually get this kind of valuable information!

It's good to now know a solution to this problem is to swap in a later model lower unit, for this horsepower range and vintage of motors.

Thanks again!
James
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T.R. Bauer



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PostPosted: Thu Feb 08, 2024 11:54 am    Post subject: Reply with quote

It's ironic this came up again. I was just at the Honda dealer dreaming of new outboards and saw the 40 and 50 hp outboards still have lower units just like my 30 year old ones. I don't know if they are the same, but they sure do look the same. BTW new outboards are flipping expensive!
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Wood Zeppelin



Joined: 09 Feb 2016
Posts: 312
City/Region: Seattle
State or Province: WA
C-Dory Year: 1997
C-Dory Model: 22 Angler
Vessel Name: C-Creature
Photos: Childhood Dream
PostPosted: Mon Apr 15, 2024 4:34 am    Post subject: Reply with quote

Does anyone know any reason why a lower unit from a 2001 Honda BF50 (part #41100-ZW4-H16ZA) would not fit a 1998 BF40 (41100-ZW4-H13ZA)? I'm just seeing the slightly different part numbers so it makes me wonder if they are the same/interchangeable ?

I am noticing that from 1998 to 2001 (3 yrs) the part number changes from H13ZA to H16ZA (also by 3)... so maybe the only difference in the parts number is that they change by the year?
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ssobol



Joined: 27 Oct 2012
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PostPosted: Mon Apr 15, 2024 10:29 am    Post subject: Reply with quote

Wood Zeppelin wrote:
Does anyone know any reason why a lower unit from a 2001 Honda BF50 (part #41100-ZW4-H16ZA) would not fit a 1998 BF40 (41100-ZW4-H13ZA)? I'm just seeing the slightly different part numbers so it makes me wonder if they are the same/interchangeable ?

I am noticing that from 1998 to 2001 (3 yrs) the part number changes from H13ZA to H16ZA (also by 3)... so maybe the only difference in the parts number is that they change by the year?


Gear ratio might be different.
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Wood Zeppelin



Joined: 09 Feb 2016
Posts: 312
City/Region: Seattle
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C-Dory Year: 1997
C-Dory Model: 22 Angler
Vessel Name: C-Creature
Photos: Childhood Dream
PostPosted: Mon Apr 15, 2024 2:10 pm    Post subject: Reply with quote

T.R. Bauer wrote:
It's ironic this came up again. I was just at the Honda dealer dreaming of new outboards and saw the 40 and 50 hp outboards still have lower units just like my 30 year old ones. I don't know if they are the same, but they sure do look the same. BTW new outboards are flipping expensive!


I do know that they have upgraded the lower unit design to eliminate this problem. It's a much better design. Rather than an inside-concentric locknut, there is a different geometry with two regular bolts inside.

And this upgraded lower unit is available for older motors, for about $1500.
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Wood Zeppelin



Joined: 09 Feb 2016
Posts: 312
City/Region: Seattle
State or Province: WA
C-Dory Year: 1997
C-Dory Model: 22 Angler
Vessel Name: C-Creature
Photos: Childhood Dream
PostPosted: Mon Apr 15, 2024 2:12 pm    Post subject: Reply with quote

ssobol wrote:
Wood Zeppelin wrote:
Does anyone know any reason why a lower unit from a 2001 Honda BF50 (part #41100-ZW4-H16ZA) would not fit a 1998 BF40 (41100-ZW4-H13ZA)? I'm just seeing the slightly different part numbers so it makes me wonder if they are the same/interchangeable ?

I am noticing that from 1998 to 2001 (3 yrs) the part number changes from H13ZA to H16ZA (also by 3)... so maybe the only difference in the parts number is that they change by the year?


Gear ratio might be different.


AHHH, Good point! Same lower unit for BF40's and BF50's, but maybe different gear ratios for the two different horsepowers..?
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Salmon Fisher



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PostPosted: Mon Apr 15, 2024 8:27 pm    Post subject: Reply with quote

IMHO I believe it is best to just purchase a lower unit, period.

It will fit. Gear ratio is of no significance when your motor is 40/50 hp on a 16 C-Dory.

I hope you don't take this wrong, not trying to offend, but try to avoid, at all costs, "Analysis Paralysis." It has bitten me in the ass more than once. I am in the midst of purchasing a new 175 hp outboard to replace a 20 year old Honda 150. I am getting the info and making the decision in one week.

Good luck in your journey!

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Patrick and Kim Walker

2004 25 Cruiser-Present

2000 22 Cruiser 2009-2014 (Sold)
2006 25 Cruiser 2014-2019 (Sold)
1985 22 Classic -2019 (Sold)
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Honey, this REALLY will be my last boat, honest!
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