1990-1998 Arctic Cat Snowmobiles Repair Manual, Page 215Get this manual
ENGINE Table ENGINE IDENTIFICATION (continued) Model 1998 Powder Special EFI ZR 580 EFI EXT 600 Triple EXT 600 Triple Touring ZR600 ZR 600 EFI ZRT600 Powder Extreme Engine cooling type Liquid Liquid Liquid Liquid Liquid Liquid Liquid Liquid Borestroke mm (in 78 62.7 75.4 65 66.5 x57 66.5x57 78 62.7 78 62.7 66.5 57 66.5 57 Displacement cc (cid 599 580 594 594 599 599 594 594