Arctic Cat makes a update chip for that model. They came original with a rich mode when you blurped the throttle for racing. The update chip, part # (3005-464) deleted that mode and cleaned up the sleds performance . Worked very well for me, had to exchange the chip with my dealer when I did this. I first tried a Black Magic "Hot Trail Chip" part# (80-1897) square. This chip seemed to work better in higher altitudes. I still have this chip if you are interested, send me an e-mail.
Just talked to my dealer, and had them look up all the service updates, and he said there is NOT one for the 98 600 efi. How did you get tour dealer to do this? could you get the update number or something and post it so I could take it to my dealer and say "do it "!
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