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i had a 98 zl-500 all stock except for studs 96 i jetted from stock 360,s to 340,s stock needle position high test gas 93 octane but watch temps below zero borderline could melt down ,some people raised the needle and jetted to 330-320 now youre screeming and possibly safe for awhile till it gets colder it depends mainly where you live good luck
 

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Stock clutching on these is horrible.....The belt slips like crazy with those light weights. Go with some Polaris weights about 2 grams heavier..........
 
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