'86 Evinrude 25 hp idling problem

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RicS1953

Cadet
Joined
Jun 7, 2012
Messages
6
The carburetor has been cleaned out thoroughly along with a new Sierra overhaul kit installation, but
will not idle right. The Sierra instruction sheet shows a needle valve bearing and a caution that "it may
not come out when needle valve is removed. Carburetor can be cleaned without removing bearing."
I managed to remove the slow-speed needle valve along with the needle valve retainer, but no bearing
was evident.
My Seloc manual identifies the carburetor as type II single barrel, front draft, with adjustable low-speed
needle valve with special packing. High-speed is fixed orifice in the float bowl. There's an exploded view
that shows packing and a packing nut, but no mention of a bearing??? Am I missing something?
I am pretty much convinced that the idle problem has to do with this area of the carburetor, but am not
100% sure of what all exactly should or shouldn't be in this particular idle circuit. The OMC part # for my carb is:
0396855. I saw a part listing for Evinrude Needle Packing part #18-7106-9 that replaces OEM part#
OMC 307583. Is this used on mine? Any help is most appreciated! Happy July 4th!
 
H

Haffiman

Commander
Joined
Dec 17, 2009
Messages
2,454
Re: '86 Evinrude 25 hp idling problem

Ditch the Seloc manual and get an OEM workshop manual for your engine and year.
 
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RicS1953

Cadet
Joined
Jun 7, 2012
Messages
6
Re: '86 Evinrude 25 hp idling problem

Thanks for your reply jasper60103- I guess that my carb doesn't contain either a seat bearing or packing/ packing nut, but the idle
problem remains unresolved, and a search for a replacement carb is next to impossible. I've tried using Seafoam in an attempt to
remove carbon build-up, but would like to hear reviews on other products like Yamaha Ring free, Mercury Quickleen or others that
would help smooth out the idle. Anyone?
 
R

RicS1953

Cadet
Joined
Jun 7, 2012
Messages
6
Re: '86 Evinrude 25 hp idling problem

Thanks for your reply Haffiman- Yes, I now realize that the Seloc manual leaves very much to be desired!
But, it was reasonably priced (just right for us folks on a rather tight budget). :rolleyes:
 
R

RicS1953

Cadet
Joined
Jun 7, 2012
Messages
6
Re: '86 Evinrude 25 hp idling problem

Here's an update on my carburetor idling problem- it's now solved! I removed the slow speed needle and retainer, looked closely with
a bright flashlight and noticed "something" was in there. I bent a tiny hook on a stiff piece of wire and managed to fish it out.
The "something" was in fact a needle valve bearing in a somewhat gimped-up condition. I knew that the part was not on the parts list
for my particular carburetor, nor was it included with the Sierra overhaul kit I had used. I found that the needle valve bearing (Part #
0314166) is used on 311 engine models from 1969 through 1978. I bought the part along with a new flush attachment and some
Johnson / Evinrude Carbon Guard.
After replacing with the new needle valve bearing by inserting the small end first using the slow speed needle to seat it, I started
the outboard and adjusted for the best idle. Wow, what a difference it made. I just launched my boat today for a trial run and it
ran great and idled smoothly the entire time! I think I'll take it out again tomorrow! :D
 
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