Honda BF50A Cylinder Dead

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adudinsk
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Re: Honda BF50A Cylinder Dead

Post by adudinsk » Tue Oct 26, 2021 4:50 am

Oh..
Awesome service manual post!

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Be Free
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Re: Honda BF50A Cylinder Dead

Post by Be Free » Tue Oct 26, 2021 6:10 am

The plugged (covered) screw is an air/fuel mix adjuster. I've never had to touch it.

I used to get my rebuild kits from boats.net.
Bill
2001 26X Simple Interest
Honda BF40D

adudinsk
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Re: Honda BF50A Cylinder Dead

Post by adudinsk » Tue Oct 26, 2021 9:43 am

Most cases they are ok..
I had one carb bunged up...
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kingtoros
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Re: Honda BF50A Cylinder Dead

Post by kingtoros » Wed Oct 27, 2021 7:39 pm

So, thanks to you guys, I took a bit of a deeper dive to figure out what the boat mechanic was talking about... I found the putty, and what part it's holding together. It's available from boats.net ... Well, let me show you guys what it looks like, and you tell me what you think:



I found the part that's puttied in, and it looks like it's a simply screw set. The putty is hard, like it's holding it in. I don't know what this particular screw does for the engine, nor does it make sense that it would cause a cylinder to fail... I suppose the $7 could be worth it to find out.

Identified as screw set #5 : https://peparts.honda.com/marine#/brows ... F50A5-SRJA

https://www.boats.net/product/honda/160 ... gJ__vD_BwE

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opie
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Re: Honda BF50A Cylinder Dead

Post by opie » Thu Oct 28, 2021 3:26 am

To folks other than the original poster, Kingtoros, the best advice is from BeFree above. Never touch the mixture.

To Kingtoros: I did a websearch to add to the discussion. I found this link for you:

https://forums.iboats.com/threads/adjus ... el.355747/

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opie
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Re: Honda BF50A Cylinder Dead

Post by opie » Thu Oct 28, 2021 3:44 am

You might as well figure on taking off the whole carb assembly and go through everything, since whoever did that goop mess on the jet screw may have bungled something else.
Let us know when you do and lots of us have advice on carbs for you.

kingtoros
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Re: Honda BF50A Cylinder Dead

Post by kingtoros » Thu Oct 28, 2021 3:51 am

opie wrote:
Thu Oct 28, 2021 3:26 am
the best advice is from BeFree above.
It was late last night, and I didn't read back before posting the photos. Thank you for this reminder as I looked back, more than a couple of you guys correctly identified this as the pilot screw, or the possible issue.

I ordered one and will keep you posted how my carb troubleshooting goes.

Thank you, Thank you, Thank you

adudinsk
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Re: Honda BF50A Cylinder Dead

Post by adudinsk » Thu Oct 28, 2021 6:05 am

Wow..

Putty!?

Not sure why anyone would put putty?!
Anyways.. if the fuel mix is off.. it can easily be adjusted back... or cleaned.. its NO big deal to tune the fuel mix.
(all older carbs had this adjustable and jets replaceable) Locking/plugging it is for emissions.. so you do not alter the mixture and pollute..

Wondering if they stripped some threads on one of the jets..then puttied it up to hold it in place.
Thus a new carb (or old one that you use for parts off ebay) is in order. Usually the last (3rd) carb is a bit different.. make sure you get the correct one you need.

Not a huge $$ anyway.. maybe around $200 us..

But it appears that someone was messing around.. and did a hack repair.
(remove the putty.. see what happens.. does the jet fall out?)

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Be Free
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Re: Honda BF50A Cylinder Dead

Post by Be Free » Thu Oct 28, 2021 10:05 am

kingtoros wrote:
Thu Oct 28, 2021 3:51 am
opie wrote:
Thu Oct 28, 2021 3:26 am
the best advice is from BeFree above.
It was late last night, and I didn't read back before posting the photos. Thank you for this reminder as I looked back, more than a couple of you guys correctly identified this as the pilot screw, or the possible issue.

I ordered one and will keep you posted how my carb troubleshooting goes.

Thank you, Thank you, Thank you
Yep, that's the one that you really don't ever need to mess with. If I remember correctly the top of it actually breaks off when you remove the cap.
Bill
2001 26X Simple Interest
Honda BF40D

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taylormade
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Re: Honda BF50A Cylinder Dead

Post by taylormade » Thu Oct 28, 2021 3:05 pm

Man, I've taken apart, cleaned, reinstalled, synched and forgotten more about BF40/50 series carbs than I care to admit but the advice you've been given here has been tremendous. These things were so finicky that they have entire manuals on JUST cleaning the carbs. I'm pretty sure I have them in electronic format... give me a day or two and I'll see if I can't scrounge them up and either post them here or email them to you.

As for synching the carbs, here's a link to a video on a BF40 that shows you exactly what you need to do. https://youtu.be/bsHCMJnRY9A

edit: here's the pdf of the BF40/50 service manual. I'll have to dig deeper to find the carb specific manual but this is pretty comprehensive and you'll learn a lot about your engine. So long as you have good compression and enough time to tinker with the carbs from time to time, these motors will run forever.
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adudinsk
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Re: Honda BF50A Cylinder Dead

Post by adudinsk » Fri Nov 05, 2021 2:45 am

Ahhh.. Danger Marine..
Good channel.
EXACTALLY what you need to do after a carb job.

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