Re: [OMC-Boats] carb question....bittersweet weekend outing

Thanks andy - marking starting points is a good idea.

  i'm still trying to see if i can pinpoint more what's going on
before i start twisting those screws. I had a interesting weekend
with the boat. Camped next to a huge lake. A huge lake that
looked like a miniature ocean, was very choppy and had about 2 other
boats on it. And there I was with a boat that I wasn't
accelerating up to plane and stalled out a few times when tested a few
days before. But nothing ventured nothing gained, right? First
and foremost - it started right up, and ran well enough to take
family members out for short little spins around in the whitecaps.
Just getting to that point and being out there zipping around was a
huge milestone for me.

As far as the carb/ running thing......I ran it the whole time without
the cowling on. It didn't completely fix things, but seemed to run
a bit better. So air supply is a partial problem and will be easily
fixed when I soon vent the cowling. (and clean the spark
arrestor) Next, fortunately the throttle didn't completely bog
when I would just move it slowly up in increments. I'd move it a
little, take my hand off, and then let the engine sort of "catch
up" to where the throttle was set, then move it some more, until
eventually was cruising around at almost full speed. And the best
part is the temp was always holding solid at 160-170. So FUN!
My last boat was an '80 Glastron with a Johnson 110 outboard, and
this '64 Deluxe seems to be faster and handle the chop a bit better -
love that. So, even though it wasn't running tip top, it was enough
to get by with and I was on cloud nine. Then of course doom had to
strike. I was on my last run heading back towards the dock
(fortunately) at almost full throttle when it started to sputter a
little.........i instinctively glanced at the brand new temp gauge and
it was pegged (somewhere over 250). Yet water was flowing through
the hoses just fine. (I still have my clear hoses on from all the
previous testing). Immediately shut it down. Felt the manifolds,
top of water pump - things were hot, but nothing close to 250
degrees. Waited 2-3 minutes and then started it back up and went
very slowly back to the ramp. It started right back up, nothing to
weird with the way it ran. So hopefully I didn't do any permanent
damage.

So now I don't what is up. Turned the key on after it was cold, and
temp gauge reads 0. All wires still connected in back. Guess I'll
take it back out this week for some more testing and see if it climbs
right up to hot, or holds at 160 for awhile and then jumps up to
hot. No matter what, I am getting a temp gauge with a built in
buzzer warning.

On Jun 19, 2009, at 4:39 PM, Andy Perakes wrote:

> 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 Monday, 22 June 2009