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Pregen's jetting is pretty much spot-on from factory, there isn't much performance gain unless you want to change the powerband.
Seems to me the bike just needs to be ridden a few tankful of Seafoam and fresh fuel, rev thru the range to get the carbs cleaned out that way.
Of course the aftermarket exhaust doesn't help.. put the OEM exhaust back on and just ride the thing.
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