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SU carb set up 444-544

posted by  Volvo From Heck on  Tue Feb 11 05:53 CST 2014
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last visit: Mon Oct 13 20:56 CST 2014
[RELATED]

I think the key bit of information here is that the linkage is off the throttle stops. So the next question is--where is the motor drawing its air from? You need to look for a vacuum leak (carbs to manifold--manifold to motor--cracked manifold--etc.) or throttle plates that are not centered. When you now set the mixture at idle speed you have to compensate for the extra air--so you richen the mixture--but guess what? Now the mixture is too rich above idle.
BTW-- the tool pictured used to originally be sold as a Uni-Syn---advertised in every magazine that covered imported sports cars in the '50's and '60's. If you can't afford such a tool--a practiced and sensitive ear can do an equal job with a short length of vacuum hose. Place the end of the hose in the same spot carb to carb and it is like listening to musical notes--when they are right (equal) you'll know it. -- Dave






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