[Rhodes22-list] Outboard repair question

[Rick]

Rummy,

Today was perfect for cruising the North Coast.  We decided to stop in at
Wildwood YC for lunch and you won't believe who helped me tie up.  It was
the last owner of the OMC dealership for this area.

Of course, he was delighted to see my trusty Yachtwin the PO had bought at
his old store.  Reluctantly (do I lie?), I brought up our argument.  He
laughed and said Evinrude typically put diaphragm carburetors on their high
end models. In fact, the diaphragm carburetor was part of defining the
Yachtwin because they do so well maintaining a steady RPM when the boat is
pitching and heeling.  And I must say, it works very well with mine in the
worst conditions.

Unfortunately, he could offer no advice on atmcneil's problem.  He sold 'em,
didn't fix 'em.

Anyway, buddy, if you have a genuine Yachtwin, you have a diaphragm instead
of a float in your carburetor.

Rick

On Fri, Aug 28, 2009 at 6:42 AM, <R22RumRunner at aol.com> wrote:

> Rick,
> First of all, a carburetor does not have a diaphragm. It might have a
> float bowl with a float in it, but no diaphragm. Replacing the fuel pump
> diaphragm is probably the easiest thing you can do. Simply remove the cover
> from
> the pump, remove the old diaphragm, install the new one and replace the
> cover.  Screwing with the idle and high speed jets is like doing brain
> surgery
> on  someone who simply has indigestion.
> Trust me on this one. The fuel pump works off of vacuum that is created by
> the internal workings of the engine. When he said it would only run on high
>  speed (throttle wide open) I knew exactly what it was. It's sucking gas
> through  the fuel pump into the cylinders, bypassing the carb. Ta Dah!
>
> Rummy
>
>
> In a message dated 8/27/2009 5:17:06 P.M. Eastern Daylight Time,
> sloopblueheron at gmail.com writes:
>
> Cool it,  Rummy.  This is a constant fuel velocity design that is running
> full  out.  A simple idle control adjustment should be tried before  major
> surgery.  If there is a diaphragm problem, the carburetor  diaphragm (if
> there is one) is a more likely culprit with gunk holding it  down to let in
> too much air. A detergent additive or a tank of high  detergent gas could
> solve it.
>
> With these engines, the  quality/stability of the engine oil is more
> significant than the quality of  the gas.  I stick with OMC's products just
> to be  safe.
>
> Rick
>
> On Thu, Aug 27, 2009 at 9:06 AM,  <R22RumRunner at aol.com> wrote:
>
> > Rick and  Andrew,
> >
> > This is the last time I'm going to tell you what is  wrong. IT'S THE
> > DIAPHRAGM IN THE FUEL PUMP. REPLACE  IT.
> >
> > Rummy
> >
> >
> > In a message dated 8/26/2009  6:13:59 P.M. Eastern Daylight Time,
> > sloopblueheron at gmail.com  writes:
> >
> > Andrew,
> >
> > This engine is a 2  stroke--generally not bothered by  old gas.
> >
> >  Rick
> >
> > On Wed, Aug 26, 2009 at 6:06 PM, Andrew Collins   <
> > sailingvesselcarmen at gmail.com> wrote:
> >
> > >  Make sure you  have fresh, treated gas. I have a new Tohatsu 4  stroke
> > > that Will not  idle if the gas is more than a couple  of weeks old
> > > This gets worse  with humid weather
> >  > Another symptom is loping at médium speeds I Will  get a filter  for
> > > NeXT season
> > > Andrew
> > >
> > >  Sent from  mobile device.
> > >
> > > On Aug 25, 2009, at  10:41 AM, atmcneil  <atmcneil at gmail.com> wrote:
> >  >
> > > >
> > > > I have an  '94 Yachtwin  (Evinrude) 8hp outboard that has a problem.
> > > > It   starts
> > > > but will only run at full throttle. It won't idle  at  all.
> > > >
> > > > Has anyone had this problem  and how do you fix  it?
> > > > --
> > > > View this  message in context:
> > >
> http://www.nabble.com/Outboard-repair-question-tp25135659p25135659.html
> >  >  > Sent from the Rhodes 22 mailing list archive at  Nabble.com.
> > >  >
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