Re: [OMC-Boats] carb question....

Tuning a carb is more art than science. Since its already running bad, you
won't hurt anything by messing with it. Its helpful if you keep track of
the original positions in case you get too far off and need a "known
running" spot to return to: It can be easy to lose count from where you
started so I usually run it all the way down, keeping careful count of the
turns. This gives you a reference point to work from. It can also be
helpful to know how many turns until the needle pops out so it doesn't
inadvertatently pop out unexpectedly and cause something to get lost.
Pulling it out gives you the change to inspect for contamination, varnish
build-up, etc. too. Just be careful you don't lose the darn things -- tie a
string on them if you have to.

----- Original Message -----
From: "jd" <jdood@...>
To: <rees4@...>
Cc: "Evinrude & Johnson Boats of the 1960's and 70's"
<omc-boats@...>
Sent: Friday, June 19, 2009 6:14 PM
Subject: Re: [OMC-Boats] carb question....

> perfect - thanks! i'm printing this out and taking it with me out
> there.
>
>
> On Jun 19, 2009, at 1:30 PM, <rees4@...> wrote:
>
>> those are your idle mixture screws. i'm assuming you have a 1970 2 bbl
>> carb. if so screw each one in gently until they stop on the needle seat.
>> back them both out 1 1/2 turns. this should get you close. run until
>> your boat is fully warmed up then one screw at a time turn the screw to
>> the right slowly till the engine just starts to hesitate and stall. next
>> turn it to the left until the fuel mixture is rich and the engine
>> starts to lope or run rough. then turn the screw to the right until
>> engine runs smooth.all this is done at idle. hope this helps. if someone
>> knows more i won't be offended if you chime in.
>> ed
>> ---- jd <jdood@...> wrote:
>>> so no one knows and/or wants to take a crack at what the two adjusting
>>> screws under the carb actually do? would love to know......so i
>>> don't make things worse by guessing my way through.
>>>
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>>
>
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Received on Friday, 19 June 2009