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Sportster Motorcycle Air intake, Carburetor, EFI, Fuel, and Exhaust Problems, advice and/or how tos for Sporster and Buell motorcycle carburators, Electronic Fuel Injection (EFI), Air Intake, Fuel and Exhaust.

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Old 20th August 2012
markncarj1's Avatar
markncarj1 markncarj1 is offline
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Join Date: May 2012
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Default Thunderheader mod and jetting

I had the bike jetted for the open thunderheader and it was still slightly lean without the shim on the needle. i decided to push 3 of the 4 fins in and wanted to know what might that do to my jetting? It seems it may be fat on the top end now but bottom end feels nice with the 45 slow and 2.5 turns out. so i just wanted to know what the mod may do to my fuel needs on the fuel curve
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