Thread: Ultra Street Avenger 670cfm jetting
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Old 10-19-2012, 09:01 PM
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Cobra Make, Engine: Lonestar Classics LS427. Self-built 408W, AFR 195 heads, Performer RPM Intake, Quick Fuel 750, 407rwhp, 479rwtq
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I have the 670 Street Avenger. I also bought mine from Summit. However, it was really messed up. Definately someone had bought it and returned it. The secondaries were opened significantly and the primaries closed. Before I figured out how to tune the carb, I couldn't get the idle below 1500.

Mine came with 65 primaries and 68 secondaries. I switched the primaries to 68 and the secondaries to 78. It runs much better now. Before, when it was hot, it would stumble at approx 2500-3k rpm. I don't have an Air-Fuel meter, so not sure exactly where it was.

Edit: Oops, sorry, I have the Steet Avenger, not the Ultra. Not sure was the differences in jetting between the SA and the Ultra is supposed to be.
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