10-06-2012, 02:20 PM
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CC Member
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Join Date: May 2008
Location: Brisbane,
QLD
Cobra Make, Engine:
Posts: 2,797
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Not Ranked
The 120 holder is giving you lean progression.
Start small on both, get it to idle at 3/4 turn out on the screws, then open the throttle with the speed screw to check progression.
If the 100 holder can't richen progression, even with a 65 or 70 idle jet, you'll need the third progression hole drilled.
This is more common with 48 IDAs on a little engine. Makes driveability a concern for a street car.
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Gary
Gold Certified Holden Technician
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