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I am planning on a few upgrads on my JS 550 and would like some help on where to start on jetting. It currently has a JetSport head and I am putting on a Westcoast manifold and exhaust pipe. Planning on a new waterbox. With this I am planning on upgrading the carb to a Super BN. I currently have two with different jets, one is 120 L and 130 H. The other is 115 L and 135 H.

Has anyone made this upgrade? Any help on where to start on jetting would be awesome....thanks!
 
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