Join Date: Dec 2005
Location: Northern Minnesota
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Sled: 2001 ZL 500 EFI ESR & 1996 Cougar 2Up
ATV: none yet, someday
I'm no expert but I've got a stock 2001 ZL 500 EFI. On GPS on a very firm lake, it hit 83 mph. It does have a 1.25 paddle track which will slows me down some. I believe around 85 hp stock probably a bit more for you since yours has aftermarket reeds. You are already clutched which I understand to be the best bang for your buck. Not sure what else to say except there is no replacement for displacement. Have someone mod it to a 600 for you. I guess it is fairly easy to make the 500's a 600 as I think they mainly just have a different bore. Hope this info is helpful to you. Good luck and think snow.