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my 98 was jetted from factory with 360,s i went to 340,s stockjet needle position some people went to 330-320 but they were realy on the edge so they had to lower clip to raise needle to richen midrange but 99 should be the same as 98 my 02 zl-500 has 330,s stock from factory so i will keep it that way for now hope this helps. thunderbird
 
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