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What's this hose and where does it end?

D

daltonallen

New member
What is this hose in the middle of pic going vertical and where does it end?
img_5786-jpeg.523397
 
Hi,
Since you didn't supply year and model, I took a guess and came up with an older 9.9 model. Close?
If not, this may not be entirely accurate but here goes:

The hose is the crankcase breather hose. The device it's hooked to up top there is the crankcase breather assembly. See item 5 in the link below


I believe that the hose simply exits out the bottom of the powerhead case to atmosphere.

But, I'm not 100% sure about that because most later models have the crankcase gasses directed into the engine intake via the Inlet air ducting and muffler system. Which, your photo clearly shows isn't present on that model.

However, it could be that the hose is plugged into the intake manifold to re-burn the gasses. I don't know because I have never worked on one.

Hope this helps.

Good luck.
 
jgmo said:
Hi,
Since you didn't supply year and model, I took a guess and came up with an older 9.9 model. Close?
If not, this may not be entirely accurate but here goes:

The hose is the crankcase breather hose. The device it's hooked to up top there is the crankcase breather assembly. See item 5 in the link below


I believe that the hose simply exits out the bottom of the powerhead case to atmosphere.

But, I'm not 100% sure about that because most later models have the crankcase gasses directed into the engine intake via the Inlet air ducting and muffler system. Which, your photo clearly shows isn't present on that model.

However, it could be that the hose is plugged into the intake manifold to re-burn the gasses. I don't know because I have never worked on one.

Hope this helps.

Good luck.
Click to expand...

Hi there thanks for your reply. Yea sorry its a '97 Honda 15hp. I did more looking around and you're right, breather hose, thank you. It was clogged and I cleaned it out. Didn't do anything.
Main problem with motor is that it runs but only with choke out, even after I let it run and warm up. The second I try to push in the choke it dies. Also the throttle seems somewhat stuck, sometimes it works, sometimes not. So I thought dirty carb. I took carb off and it looks clean but I will take it apart and spray with carb cleaner.
Any other ideas?
 
Yes! 100% agree that you should clean the carb.
These are pretty simple and easy to deal with.

The having to have the choke on to keep it running points to clogging in the low speed/idle circuit and particular attention should be paid there.

One item on these that can be a pain is the low speed jet tube or "jet set". See item 11 in the link.


Inspect that tube very carefully, especially the orifice that you can only view by looking into the end of the tube. Very tiny and can be very hard to get clean. I would say just replace it but they are no longer available.

The little Oring at the top of that tube (item 1) is VERY CRITICAL to the operation of this carburetor. I recommend that you buy the gasket set that includes that oring, the mixture screw oring and the float chamber seal. Then, treat that oring with kid gloves being careful not to damage it during installation. Vaseline works well for inserting the tube back into the carb.

While the tube is out, spray cleaner into the passage it plugs into and verify that fluid exits the idle orifice at the top of the rear of the carb throat and the low speed air jet passage on the front carb flange.

It helps to fashion a 90°.bend in the tip of the spray straw to direct cleaner first to the rear and then to the front.

Then prop the throttle blade open and cover each delivery orifice, including the idle, with the end of the straw and hose them out one by one.

Then spray directly into the low speed and high speed air jet passages using liberal amounts of cleaner.

Those two passages are the two holes other than the bolt holes on the front flange of the carburetor. Pay particular attention to the low speed one (outermost hole) because your problem is in that circuit.

Be sure to flush out the idle mix screw hole and take care not to solidly bottom out the screw when reinstalling and adjusting.
If you count the turns it takes to back it out, just use that as your adjustment going back in.

Make sure the atmospheric vents are clear then reassemble.
 
As to the throttle sticking, you might try oiling the throttle shaft with machine oil (not WD-40!) when you have the carb off.

Other than that, I might suspect a problem with the tiller handle mechanism or even a damaged cable end. Only very close inspection will likely reveal something there.

Other things I would consider on an outboard this old, especially if it's a recent buy, would be timing belt condition and valve adjustment.

The fact that you found the breather hose clogged could indicate that there may be more to find under the breather valve housing. Spiders, dirt daubers and other critters tend to like setting up house in those and there's a filter screen in there that needs periodic cleaning.
But, handle everything in there with care, including the gasket, because none of it is sold anymore.
Although, you could use a squeeze tube gasket maker if the old one crumbles in your hand.

Those are some sweet old outboards and I hope you get it dialed in.

Good luck.
 
Wow that's a lot to unpack haha. I'll do my best. My FIL bought it for us summer of '22. His friend tuned it up before we got it and I used it a handful of times and worked just fine. Then it sat through thte winter and yadda yadda. At first it wasn't spittin water so I clean and replaced the pump wheel and all that and now it's the current situation. I'll look at it more this weekend.
Thanks heaps for your time and help I really appreciate it. I wasn't sure anyone used these forums anymore haha!
 
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