Re: [OMC-Boats] Question about carbs

Those are the choke mechanisms.   Engines can and do run just fine without them hooked up but in colder climates they can be dogs to get started.  If that's problematic for you, it would be better to get them working again.  The black cap and tubes are a dime a dozen in auto salvage yards or you can usuall get them new at the parts store.

The black cap has a coil spring mounted to it that is affected by heat.  The spring rests against that tab you see sticking out of the one mechanism.  When cold, the spring winds tighter and presses against the tab which causes the choke plate to close enriching the gas mixture.  The tubes draw air from inside the intake manifold through the spring chamber using vacuum.  As the air heats during warm up, the spring relaxes and allows the choke plate to open.  The black cap can be rotated to control the degree of tension on the choke plate and thus the duration the choke plate stays closed as well as to what degree it stays partially closed when warm.

You have two carbs on your engine?  If so, that must be a pain to synchronize.  Anyway, there should be an equivalent heat pipe and manifold hole for the 2nd carb.  If not, you can probably rig up a tee fitting to draw heated air from the same source but the tubes need to be metal due to the heat.  I believe for the most part the heat pipe has a nut only on one end.  The other end just slips into a hole in the intake manifold and rests there.  I would think any manifold designed for multiple carbs would have the necessary fittings/openings for each carb.

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

--- On Tue, 8/18/09, Nexi <ohnoitsnexi@...> wrote:

From: Nexi <ohnoitsnexi@...>
Subject: [OMC-Boats] Question about carbs
To: omc-boats@...
Date: Tuesday, August 18, 2009, 11:52 PM

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Received on Wednesday, 19 August 2009