justin_o_guy2
Serious Thumper
Offline
What happened?
Posts: 55279
East Texas, 1/2 dallas/la.
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The reason we rejet is, the bike is set up to run lean, from the factory. My understanding is that its done like that to help the bike get thru certain EPA requirements. Some older models had reasonable jetting from the factory, back before the EPA requirements. Running lean, as it does, makes it run hotter & decreases performance & makes it backfire & just generally isnt okay, so, we rejet, even if leaving the exhaust stock. Now, you go a diddlin with the way it breathes & getting the airflow thru the motor working smoother & faster, that will lean it out some MOre, so ya sure gotta rejet, then.
IDK how the Dyna flows compared to the stock unit, but, unless its old enough to be jetted right, it needs rejeted. Even if you leave the stock exhaust.
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