04-24-2010, 10:51 AM
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CC Member
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Join Date: Apr 2007
Cobra Make, Engine: # 757 ERA 427 SC , 482 Al. big block
Posts: 896
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Not Ranked
Check your needle and seat on the secondary ... sounds like it might be stuck or the float is hanging up . You didn`t say , but if you have power valves , they sometimes leak and make it almost impossible to get the engine to idle as it runs really rich . What do your plugs say ?
On the primary side , if you turn the carb over , you should have about .020" of the transition slot showing . The mixture screws should be in the 1 3/4 turn out range as a starting point .
I cured the bog in mine by raising the float level slightly ( brings the main circuit in sooner ) and backing the mixture adjust screws out about 1/4 to 1/2 turn from best idle .
The secondaries should just be cracked slightly so you have about .020" of the transition slot showing .
These are starting points and you will have to play from there .
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