Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10 5/3/83; site raybed2.UUCP Path: utzoo!linus!raybed2!gxm From: gxm@raybed2.UUCP (GERARD MAYER) Newsgroups: net.auto.tech Subject: Re: Proper Needle Sizes for SU HS-4 Carbs. on Detoxed MGB et. al. Message-ID: <1016@raybed2.UUCP> Date: Fri, 1-Nov-85 08:47:09 EST Article-I.D.: raybed2.1016 Posted: Fri Nov 1 08:47:09 1985 Date-Received: Sun, 3-Nov-85 12:31:15 EST References: <1154@homxa.UUCP> Organization: Raytheon Co., Bedford MA Lines: 10 On my '71 MGB with dual SU carb I can easily test if the mixture is too rich by lifting the manual piston rod slightly while the engine is at idle. If it is too rich the engine slows and does not return to the same idle speed. When it is just right the engine speed stays the same as I lift the piston rod. I have found this to be a sensitive method with a little practice. Noise: I had the same problem and in my car it turned out to be the vapor collection canister in the trunk was loose enough to hit when I took OFF!!! Gerry Mayer uucp linus!raybed2!gxm