2004 Polaris Pro X Factory Service Manual, Page 8Get this manual
SPECIFICATIONS MODEL: 550 PRO MODEL NUMBER: S04NX5BS ENGINE MODEL: EC55PM080
ENGINE Engine Type Engine Displacement cc Bore inmm Stroke inmm Cylinders PistonCylinder Clearance inmm Piston Ring End Gap inmm Piston Marking Piston Ring Marking Operating RPM 200 Idle RPM 200 Engagement RPM 300 Fuji 544cc 2.87"73mm 2.56"65mm .004 .0049" .090 .125mm .016 .021" .40 .55mm NA 7000 1600 3800 Type Main Jet Pilot Jet Jet Needle Needle Jet CARBURETION Mikuni VM 34 360280 PTO270 MAG 40 6BGY33Q2 (480)
Throttle Gap Under Cutaway .078" inmm 2.0mm Cutaway Valve Seat Starter Jet Fuel Screw Pilot Air Jet Air Screw Fuel Octane (R+M2) AMBIENT TEMPERATURE 2.0 1.5 Viton 145 1.5 Turns 0.9 NA 87 OctNonOxy89 OctOxy
Altitude
0600 (02000) 6001200 (20004000) 12001800 (40006000) 18002400 (60008000) (6000 8000) 24003000 (800010000) (8000 10000) 30003700 (1000012000) (10000 12000)
Below -30 Below -34 300290 #4 290280 #3 270260 #3 250240 #3 240230 #3 220210 #2
-30_ to 10_F -34_to -23_C 290280 #3 270260 #3 260250 #3 240230 #3 230220 #2 210200 #2