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03 600 ho rev jetting and needle. Would be good idea to check with big john from sled head racing too. He might be able to help you get the needles if they are different than what’s in your new carbs. They are getting a little harder to get. Crankshop in Vermont had some too last time I checked.
 

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I have a message in to john see what he says. Looking for info because I'm told the zx air box flows more air than the rev setup.
 
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