Re: [OMC-Boats] OMC-Boats Digest, Vol 38, Issue 15

Do the easy things like check the rubber plugs at the carburetor - they can
be dry and crack and look good but be leaking. Check the timing and dwell
assuming you are on points ignition. Check gas filters and fuel flow.
Probably something minor. TK
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Sent: Wednesday, June 23, 2010 12:00 PM
Subject: OMC-Boats Digest, Vol 38, Issue 15

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> 1. Loss of compression and stalling question (John Schmelzeis)
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> Message: 1
> Date: Tue, 22 Jun 2010 08:07:04 -0700
> From: "John Schmelzeis" <northphx@...>
> Subject: [OMC-Boats] Loss of compression and stalling question
> To: <omc-boats@...>
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> I was boating on Lake Powell over the last 5 days and had the following
> problem:
>
> Intermittently slows then ultimately stalls when over 1.5K RPM for any
> duration over 1 min
> a.. I found a loss of vacuum where the carburetor meets the manifold and
> successfully addressed via using gasket sealer...yet, still experienced
> the following
> b.. Running low compression no matter what tweaks made to carburetor pins
> and idle RPM setting (14 at best ; usually 15 - 16...maybe this is
> attributable to altitude?)
> c.. Compression = ~7 - 10 at 2K RPMs
> d.. Compression = 5 at 2.5 - 3K RPM
> Could be loss of compression elsewhere, timing, or other? Any thoughts
> and recommendations would be appreciated.
>
> Thanks,
> John
> '67 Surfer
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> End of OMC-Boats Digest, Vol 38, Issue 15
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Received on Wednesday, 23 June 2010