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Discussion Starter #1
I have a 1990 80" EVO FXSTC. Been running Super E and Stage 1 cam for many years and the bike purred. Over the winter I changed to EV-4 cam and Thunderheaders .

Runs great now except at low loads and speeds it sputters. My dealer increased the size of the main and intermediate jets, but still not quite right. Acceleration and higher speeds ok.

Not sure if the combo of cam and headers is causing this, and my shop is guessing at which size jets to use.

Any suggestions appreciated!

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