340's will be fine BUT, you need to add Q-4 (480)needle tubes to fatten up the mid-range The 5's have a hot spot in the middle if jetted down. You should see a nice increase in mileage too ^_^ Merry Christmas
I ride an 00ZL 500 also. Spoke with dealer (VT) who said I could go down to 340 no problem. I jetted down to 340 without any issues thus far (2000+ miles Vforce reeds and synthetic oil). Please explain the Q-4 (480) needle tubes in more detail. Thanks.
i too jetted down from 360 to 340 on my 98 zl-500 but watch out for cold temps below maybe zero, and allways use high test gas too, i sold it to guy who had a friend with same sledd and same year jetted same to and they both holed pto piston at 20 min. apart temps were 10 below zero i now own a 02 zl-500 and the factory stock jetting is at 330 but now it has the temp.sensor that monitors the lean midrange which these motors are noted for .
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