Most 2 cycle engines only have two adjustments. One is the idle stop screw
which adjusts the idle speed. The other adjustment is the idle mixture
screw. This adjusts how much gas you are burning at idle. Not that hard to
adjust. Get the engine running at what you consider to be a good idle speed and
then adjust the idle mixture screw until the engine is running smoothly. A
little on the rich side is better than to lean. You may have to tinker
with both of them until you get it right, but these are really simple engines.
I would also recommend taking some carb cleaner with you and spray it down
the throat of the carb while the engine is running. Probably isn't
necessary, but couldn't hurt.
Rummy
In a message dated 8/28/2009 10:52:39 A.M. Eastern Daylight Time,
atmcneil at gmail.com writes:
I did adjust the idle screw and it didn't have any affect whatsoever.
That's
why I'm thinking Rummy may be right. I'm certain the carb will need some
serious adjustment once I can get it to run anywhere but wide open.
Rick-139 wrote:
See the original archive post
show more >>>
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>
> Did you try adjusting the idle set screw? It is external to the engine
> and
> just changes the stop position of the throttle rod--not a jet adjustment
> as
> Rummy seems to think.
>
> Rick
>
> On Fri, Aug 28, 2009 at 8:33 AM, atmcneil <atmcneil at gmail.com > wrote:
>
>>
>> Well, I'm picking up a fuel pump rebuild kit today so we should find out
>> if
>> you're right be the end of the weekend. I sure hope you are right,
>> because
>> I
>> really would like to get this motor running.
>>
>>
>>
>> R22RumRunner 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.
>> >> > >
>> >> > > __________________________________________________
>> >> > > To subscribe/unsubscribe go to
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>>
>> --
>> View this message in context:
>> http://www.nabble.com/Outboard-repair-question-tp25135659p25189122.html
>> Sent from the Rhodes 22 mailing list archive at Nabble.com.
>>
>>
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go
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>>
> __________________________________________________
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>
--
View this message in context:
http://www.nabble.com/Outboard-repair-question-tp25135659p25191328.html
Sent from the Rhodes 22 mailing list archive at Nabble.com.
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