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Re: [Spridgets] Why Does Engine Like to Run Rich?

To: "Spridgets" <spridgets@autox.team.net>
Subject: Re: [Spridgets] Why Does Engine Like to Run Rich?
From: "Glen Byrns" <grbyrns@ucdavis.edu>
Date: Tue, 26 May 2009 08:05:12 -0700

> Stock 948 with good rings, stock rebuilt H-1 1 1/8" SU's.  I've adjusted 
> the
> carbs per the workshop manual, used Colortune, and even Frank's trick of a
> standard 2 1/2 turns down (15 flats) on the jet adjusting nuts several 
> times
> over the past couple of years and they all point to running a lot leaner 
> than
> where the engine runs best.  The engine starts, runs, and accelerates best 
> at
> 25 flats down (over 4 turns) on both carbs.  Right now it seems to 
> accelerate
> best when the front carb is even at 30 flats (5 turns) down.  I've tried 
> rich
> needles but it runs for crap with these.  Spark plugs are always black and
> sooty.  Why does it like rich?
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