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Re: SU Basics 102 (SU-hs6 on B30A) 140-160 1970

posted by  someone claiming to be George Downs on  Sun Apr 15 12:25 CST 2001 [RELATED]

Hey Chris!

Been there. I noted a couple things in your comments, one

not seen. Did you take out the secondary butterflies in the

manifold or are they still there? If they are, do the carbs

have the arms to open them? If not, you have to take the secondary

butterflies out or you only get about 1/3 throttle.

When you lift a piston and it speeds up, your mixture is RICH.

If it slows down it is lean. If your throttle shafts are loose

in the carb body, allowing air leakage at idle, all bets are off

and you cannot set mixture on the basis of idle behavior.

IPD is now selling Gunson's "Colortune" device, which I heartily

recommend. I use two of them, one in #2 and one in #5 so I can

adjust both carbs at the same time. After getting good initial

settings you can check manifold effects by comparing 2 with

1 and 3; 5 with 4 and 6. Because of manifold design, it will

never be perfect but you can average out pretty good.

Pete is right, choking one carb is sufficient. don't worry

about stringing more cables.





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