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ATK 1990 brochure, 604 Cross Country/Motocross: SOHC four-valve air-cooled Rotax, 38 mm Mikuni flat slide, dry sump. Dry weight: Cross Country 264 lb electric / 247 lb kick, MX 259 lb electric / 245 lb kick (CC kick recorded). Fuel capacity printed as '4.7 gallons (12.1 L)', internally inconsistent, so left null. Kick or electric start by version.