Let's back up a step. Was the motor ever running for you normally? What
changed or what did you do to it that caused this situation?
Rummy
In a message dated 8/29/2009 11:38:51 A.M. Eastern Daylight Time,
atmcneil at gmail.com writes:
Well, I rebuilt the fuel pump yesterday and reinstalled it, and am sorry to
say it didn't fix it.
I have the bench manual and it was talking about the "throttle adjustment
knob" on the tiller. Well, mine isn't connected to anything and just spins.
That may have something to do with it.
dang this is frustrating.
Rick-139 wrote:
See the original archive post
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>
> 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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> __________________________________________________
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--
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Sent from the Rhodes 22 mailing list archive at Nabble.com.
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