2000 Arctic Cat ATV Factory Service Manual, Page 186Get this manual
Carburetor Specifications
250300 cc Type BST31 Main Jet 137.5 130 Main Air Jet 1.1 Pilot Jet 45 Pilot Air Jet 155 Throttle Valve 120 Pilot Screw Setting (turns) 34 Needle Jet P-6M (250 cc) P-8M (300 cc) Jet Needle 4D28-3 Idle RPM 1200-1350 Valve Seat 2.0 Starter Jet 50 Pilot Outlet 0.8 Float Arm Height 13 mm (0.5 in Throttle Cable Free-Playmm (at lever) (1814 in
Type Main Jet Main Air Jet Pilot Jet Pilot Air Jet Throttle Valve Pilot Screw Setting Jet Needle Needle Jet Idle RPM Valve Seat Starter Jet Float Arm Height
BST34 145 0.9 55 155 105 (turns) 1418 4E7-4 O-4 1200-1350 2.3 110 13 mm (0.5 in