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Doug
Captain

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USA
457 Posts
Initially Posted - 03/03/2002 :  18:29:12  Show Profile
Today is one of the warmest days of the year so far. Sun is shining, light breeze, and mild temperatures on Puget Sound. We run to the boat, pull off the tarp and- the outboard won't run.<img src=icon_smile_angry.gif border=0 align=middle>

The motor is an older Honda 100 (9.9 hp).
It starts, but fairly quickly floods and stalls. I took the top off and drained the carb. Started it, and she runs OK for a bit then starts running a bit rough and dies. This is what worries me- There's a hole on top of the carb, and when the motor starts running rough it gas starts flowing through that hole. I may not know much about outboards, but I assume there should not be gas on the outside of the carb.

Any thoughts?

Doug - #1913 Noeta

Edited by - doug on 03/03/2002 18:50:38
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Arlyn Stewart
Master Marine Consultant

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USA
2980 Posts
Response Posted - 03/03/2002 :  21:07:33  Show Profile  Visit Arlyn Stewart's Homepage
What is likely happening, is the float needle is not closing fully. This allows gas to continue to be pumped into the float chamber and thus why it eventually overflows out the weep hole.

The fix is fairly simple...clean the float needle. Use Chemtool or a carb cleaner. If that doesn't solve the problem...replace the float needle and seat.


Arlyn C-250 W/B #224
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Douglas
Master Marine Consultant

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1595 Posts
Response Posted - 03/04/2002 :  01:35:49  Show Profile  Visit Douglas's Homepage
That sounds right to me. Your float is sticking. Rare case senario the float is bad and fuel has gotten inside the bulb/float.
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Todd Frye
Navigator

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USA
222 Posts
Response Posted - 03/04/2002 :  13:53:05  Show Profile
Doug
I am currently going through my Honda 7.5 O/B and "rebuild the carb" is on my list. There is a small tab on the float that can be bent up or down, allowing the needle and seat valve to be adjusted. I could fax you a copy of this measurement, but it would be for a 7.5. As an old Porsche mechanic, replacing (rather than cleaning) the needle and seat was the most effective fix. Todd Frye
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Leon Sisson
Master Marine Consultant

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USA
1893 Posts
Response Posted - 03/04/2002 :  17:18:30  Show Profile  Visit Leon Sisson's Homepage
I fully agree with what the others have said, that the symptoms you list perfectly describe a float needle and seat that aren't sealing correctly. My experience has been that they can usually be cleaned. (The ones I've had to replace from wear have been on engines that had very high hours and/or vibrated a lot -- ancient British bikes.) If you have not looked inside your carb's float bowl lately, this would seem to be a good time to do so.

Small 4-strokes have very tiny fuel passages, especially for idle. Boat motors tend to sit for long periods of time. Old gasoline turns into solid crud that can clog carb passages.

Old Hondas in particular are prone to clogged idle jets. The jet is semi-accessable on the 9.9HP, but a pure !@#$%&* to get at in the 7.5HP. After cleaning dried up gas crud out the carb of just about every cranky outboard I've worked on, I've gotten fairly conciencious about unhooking the fuel line and running the engine dry after each and every use.

-- Leon Sisson
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.