90HP Honda rough idle and misfire

Sea Wolf · Posted: Wed Jan 07, 2009 10:22 pm Post subject:

I found a source of help for Honda outboard owners. It has tons of discussions about solving problems with various sized engines, from what I can tell preliminarily.

Take a look and see what you think.

Honda Outboards

This could be a pretty good find!

It also has discussion forums for all the other major outboard brands too!

And if you scroll down on the last link, there are discussions on I/O's, Inboards, and Diesels, too!

Joe. Teeth

blackfish · Posted: Thu Jan 08, 2009 10:20 am Post subject:

I agree Joe it's a great site
I've been checking it out for the last year or so
the member going by the name "just in time " is honda marine tech very helpful guy

akhamsi if you post your problem I sure you will get some help

Wefings · Posted: Thu Jan 08, 2009 10:26 am Post subject:

Those emulsion tubes are payback for ww2.
Marc

Sea Wolf · Posted: Thu Jan 08, 2009 10:41 am Post subject:

Marc-

You got my curiosity going as to what those emulsion tubes looked like and were all about, so I looked for a photo. Couldn't find one of a Honda outboard, but the one below is from a Honda motorcycle, and is probably somewhat similar and illustrates why the little bugger holes are so sensitive to gas quality issues.

I'm guessing these bridge across the throat of the carburetor, are enclosed in the carburetor throat's walls on either end, and fuel is fed out of the little holes into the intake air, with the little holes intended to make the droplets smaller than regular jets, and thus "emulsify" it (?)

Thanks for the ideas and fun comments!

Joe. Teeth

T.R. Bauer · Posted: Thu Jan 08, 2009 8:02 pm Post subject:

Almas Only · Posted: Fri Jan 09, 2009 12:32 am Post subject:

Joe:

It's been a while since I had my carbs torn down, but I think the flow in the emulsifier tube is in the reverse direction: fuel is taken up through the jet in the bottom of the tube, air is sucked in through the holes in the side, they do a little mixing toward the top, and the mixture is then sucked into the throat of the carb, where it is picked up by the air flowing through the carb throat. I don't believe the sides of the tube are actually exposed to the air flow through the throat.

Although it would be possible for debris, and general gunk to plug the holes in the tube, I would expect to find plugging at the jet, or at the holes in the side of the throat for the idle and main fuel supplies, as these are far smaller in diameter than those in the side of the tube.

Anyone have more precise knowledge on this?

Sea Wolf · Posted: Fri Jan 09, 2009 12:50 am Post subject:

Wefings · Posted: Fri Jan 09, 2009 3:18 am Post subject:

I couldn't find a diagram either , and at this point , still am away being tortured with 70+temps and great music in New Orleans. But Im pretty sure Almas Only is correct in that they are on a vertical axis . They are thin walled brass and seem to split or rupture when pressurized .
Marc