Re: [OMC-Boats] She let me down...

Yes, talking about the two screws at the bottom of the carb.  The don't control overall idle RPMs per se, the control the flow of fuel which can affect RPMs but is not the same as the screw on the linkage cam lobe.

If you have it set too lean (IN) then it will be have as though it's starving for fuel (at idle or higher speeds).  Out to far and it will run rich.  Gotta find the best setting by sound.  When it starts running smooth the RPM's will increase but can be turned down then with the linkage idle screw....if that makes sense.

-Bill
Dallas, TX
1970 Evinrude Explorer - 155 Buick V6 - OMC Sterndrive
http://www.photobucket.com/evinrude_explorer

--- On Thu, 9/17/09, Justin DeSantis <duc1098desmo@...> wrote:

From: Justin DeSantis <duc1098desmo@...>
Subject: Re: [OMC-Boats] She let me down...
To: "Evinrude & Johnson Boats of the 1960's and 70's" <omc-boats@...mate.com>
Date: Thursday, September 17, 2009, 8:25 PM

It's not my first carb rebuild by FAR. I've done more motorcycle carbs than I can count. Just not many for cars or I/O boats. (Plenty on outboards though.) I'm still confused by what you guys are referring to as the idle adjustment screws. I think those are the mixture screws. And I realize I need to count how many turns out they are set. But that still leaves me with the actual idle adjustment screw and where to set it. Because it seems like if I set it too tight, it restricts the top butterfly from moving smoothly. I have such a hard time explaining this stuff. I wish one of you jokers lived local to me. Someone move to Pittsburgh already!

Justin

On Thu, Sep 17, 2009 at 9:03 PM, Andy Perakes <aperakes@...> wrote:

Something to be aware of, when I did mine, I discovered the previous owner installed the accelerator pump and the other related ball bearings in reverse putting the LARGE bearing into the accelerator pump hole instead of the small one.  It's wedge permanently in place reducing it's effectiveness.   I'm on the hunt for another 2G carb so I can have it fully functioning.  It doesn't seem to affect performance at the moment (when it peforms good) but I want to know that it's fully functional!  Anyway, my point is to be sure to put the smaller of the two bearings in the accelerator pump outlet.

The other thing to be aware of is to run the idle adjustment screws in and them back them out about 2.5 turns.  I backed mine out 2 turns and found it wasn't quite enough.  That will totally be a subjective setting based on how well it idles.

Keep us posted!

-Bill
Dallas, TX
1970 Evinrude Explorer - 155 Buick V6 - OMC Sterndrive
http://www.photobucket.com/evinrude_explorer

--- On Thu, 9/17/09, Justin DeSantis <duc1098desmo@...> wrote:

From: Justin DeSantis <duc1098desmo@...>
Subject: Re: [OMC-Boats] She let me down...
To: "Evinrude & Johnson Boats of the 1960's and 70's" <omc-boats@...>
Date: Thursday, September 17, 2009, 4:58 PM

found the problem. Or, problems, rather. First, the float is full of
gas. I found 3 tiny cracks in it. I have a hard time believing it
happened all at once, so I figure it's been slowly filling with gas a
bit at a time. Also found the rubber gasket on the accelerator pump
was ripped. So that probably wasn't helping either. I had to order a
rebuild kit, it will be here tomorrow. The float was no longer
available from the parts store. So I'm going to solder the cracks
closed, I've had success with it in the past.

I need a HUGE favor from someone. My service manual still isn't here.
I'm going to email the guy I bought it from, but thats a different
story. Anyhow, there are a few screws and adjustments on this carb
that I'm unfamiliar with. One being the adjustment screw on the port
side, towards the rear. The linage for the choke seems to bump against
it. If that makes sense. Anyhow, would anyone be willing to scan me
the pages that pertain to carb set-up and default setting from the
manual? I'd be happy to pay a few bucks for your trouble. Normally,
I'd just figure it out myself, but we have plans to use the boat
Saturday and that hinges on me being able to get it back together
tomorrow afternoon. Anyone want to take pity on me and help me with my
Johnson? (That doesn't sound good...)

PS, my auto mechanic friend might have a service manual for the 67
Buicks. Would the carb section from the car manual be of any help?

On Thu, Sep 17, 2009 at 11:50 AM, Nexi <ohnoitsnexi@...> wrote:
> I have a similar problem. The best guess is the float. Don't have my service
> manual yet so I'm interested to hear your findings.
>
> If the carbs are just dirty I'd try running some Sea Foam through and see if
> that clears things up a bit.
>
> ________________________________
> From: Justin DeSantis <duc1098desmo@...>
> To: Evinrude & Johnson Boats of the 1960's and 70's
> <omc-boats@...>
> Sent: Thursday, September 17, 2009 11:21:09 AM
> Subject: Re: [OMC-Boats] She let me down...
>
> I hope not. I really don't want to have to lay out anymore money right
> now, even if it's not much. I'm going out now to take a look. I'll
> report back with my findings. Thanks guys.
>
> On Thu, Sep 17, 2009 at 10:43 AM, Scott Veazie <scottveazie@...hotmail.com>
> wrote:
>> Hey Justin,
>>
>> Time for a carb rebuilt.  It's really easy on those two barrel carbs
>> though,
>> so you should be back up and running in no time!
>>
>> ~Scott
>>
>>> Date: Wed, 16 Sep 2009 22:14:52 -0400
>>> From: duc1098desmo@...
>>> To: omc-boats@...
>>> Subject: [OMC-Boats] She let me down...
>>>
>>> So I pull the old Surfer to the ramp today, get her down in the water.
>>> Hit the key and she fires right up. Runs a few seconds and flat dies.
>>> Repeated tries failed to fire it back up again. It just wouldn't
>>> start. Plenty of juice. Had the engine cover up, and noticed it
>>> smelled of gas. Went back and looked, the entire intake manifold was
>>> wet with gas. Took the air cleaner cover off and watch the carb as I
>>> cranked it over. It's shooting a lot of gas. Actually, looks like it's
>>> shooting more gas than it should while cranking. It was dark by the
>>> time I got it home so I haven't messed with it yet. Tomorrow I'll look
>>> into it further. I'll gladly accept any suggestions of things to look
>>> at tomorrow.
>>>
>>> Good thing I'm laid off. I don't know how people with boats have jobs.
>>> There's always something to do to a boat. Who has time to work.
>>> _______________________________________________
>>> OMC-Boats mailing list
>>> OMC-Boats@...
>>> http://lists.ultimate.com/mailman/listinfo/omc-boats
>>
>> ________________________________
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>> now.
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>>
>>
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Received on Thursday, 17 September 2009