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Re: Carb Mixture

To: choffman9@cinci.rr.com (Curt Hoffman)
Subject: Re: Carb Mixture
From: tr6taylor@webtv.net (Sally or Dick Taylor)
Date: Sat, 13 Sep 2003 11:39:16 -0700 (PDT)
Curt---The lifting of the air valve to test for mixture can be
deceiving, if you lift too far. Just go 1/16". If the engine doesn't
falter you may be OK.

If your carbs have the adjustable needles, they won't also have the
adjustable jets, unless you have mixed-and-matched carburetor parts.

The trim adjustment screws should be turned in all the way home.

As a further test, if you can't get more fuel, try less air. Take off
the air filter housing and hold a shop towel (or some porous rag) over
each air inlet in turn, then both at the same time. If the engine speeds
up, then indeed the mix is a little lean. This could indicate that
unmetered air is getting into the engine. Check all places that this
could happen. (Open carb [vacuum] ports underneath, incomplete manifold
gasket sealing, etc.)

I can't recommend that you go to a richer needle, unless you have
modified the engine in other fuel-demanding ways. The stock B1AF should
do the job.

Dick

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