Polaris Sportsman 850 - Engine Specifications - 1000

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3.9
ENGINE SPECIFICATIONS - 1000
CYLINDER HEAD (IN. / MM)
Camshaft
Cam Lobe Height - Intake (Standard) 1.566" (39.795 mm)
Cam Lobe Height - Exhaust (Standard) 1.577" (40.067 mm)
Camshaft Journal Outer Diameter - (All) .8632" ± 0.0004" (21.925 ± 0.01 mm)
Camshaft Journal Bore Inner Diameter - (All) .8665" ± 0.0004" (22.01 ± 0.01 mm)
Camshaft Oil Clearance
0.0033" ± 0.0008" (0.085 ± 0.02 mm)
Camshaft End Play 0.008" ± 0.004" (0.20 ± 0.10 mm)
Rocker Arm and
Shaft
Rocker Shaft O.D. (Intake and Exhaust) 0.5501" (13.973 - 13.984 mm)
Rocker Shaft Bore I.D. (Cylinder Head) 0.5543" ± 0.0006" (14.079 ± 0.014 mm)
Rocker Arm Bore I.D. (Intake and Exhaust) 0.5514" - 0.5525" (14.006 - 14.033 mm)
Cylinder Head
Cylinder Head - Surface warp limit 0.004" (0.1 mm)
Cylinder Head - Standard height 3.611" (91.71 mm)
Valve Seat
Valve Seat - Contacting Width - Intake 0.047" ± 0.008" - 0.0039" (1.20 ± 0.20 mm)
Valve Seat - Contacting Width - Exhaust 0.047" ± 0.008" - 0.0039" (1.20 ± 0.20 mm)
Valve Seat Angle
45.5° ± 0.25°
Valve Guide
Valve Guide Inner Diameter
0.217" + .0005" - 0.0 (5.52 + .012 - 0.0 mm)
Valve Guide Protrusion Above Head - Intake
0.361" ± 0.010" (9.18 ± 0.25 mm)
Valve Guide Protrusion Above Head -
Exhaust
0.315" ± 0.010" (8.00 ± 0.25 mm)
Valve
Valve Lash (Cold) - Intake
0.000" (.000 mm)
Refer to Chapter 2 “Valve Clearance Adjustment”
Valve Lash (Cold) - Exhaust
Valve Margin Thickness - Intake 0.04" (1.00 mm)
Valve Margin Thickness - Exhaust 0.027" (.70 mm)
Valve Stem Diameter - Intake
0.2163" ± 0.0003" (5.495 ± 0.0075 mm)
Valve Stem Diameter - Exhaust
0.2159" ± 0.0003" (5.485 ± 0.0075 mm)
Valve Stem Oil Clearance - Intake
0.0012" ± 0.0005" (0.031 ± 0.0135 mm)
Valve Stem Oil Clearance - Exhaust
0.0016" ± 0.0005" (0.041 ± 0.0135 mm)
Valve Stem Overall Length - Intake 4.6638" ± 0.012" (118.46 ± 0.30 mm)
Valve Stem Overall Length - Exhaust 4.5488" ± .012" (115.54 ± 0.30 mm)
Valve Spring
Valve Spring Free Length 1.904" (48.35 mm)
Valve Spring Installed Height
Intake - 1.650" (41.91 mm)
Exhaust - 1.650" (41.91 mm)
ENGINE / COOLING SYSTEM