Polaris 2012 Sportsman Forest 500 International, Service Manual

Page: 59 / 432

3.4
ENGINE
9923412 - 2012 Sportsman 400/500 and EFI Tractor Service Manual
© Copyright 2011 Polaris Sales Inc.
Sportsman 500 H.O. Engine Service Data (EH50PLE 498cc Fuel Injected and Carbureted)
Cylinder Head / Valve EH50PLE (498cc)
Rocker Arm
Rocker arm ID .8669-.8678”(22.020-22.041 mm)
Rocker shaft OD .8656-.8661 (21.987-22.0 mm)
Rocker shaft Oil Clearance
Std .0008-.0021” (.020-.054 mm)
Limit .0039” (.10 mm)
Camshaft
Cam lobe height
In
Std 1.2884-1.2924" (32.726-32.826 mm)
Limit 1.2766" (32.426 mm)
Ex
Std 1.2884-1.2924" (32.726-32.826 mm)
Limit 1.2766" (32.426 mm)
Camshaft journal OD
Mag 1.4935-1.4941" (37.935-37.950 mm)
PTO 1.4935-1.4941" (37.935-37.950 mm)
Camshaft journal bore ID
Mag 1.4963-1.4970" (38.005-38.025 mm)
PTO 1.4963-1.4970" (38.005-38.025 mm)
Camshaft Oil clearance
Std .0022-.0035" (.055-.090 mm)
Limit .0039" (.10 mm)
Cylinder Head
Surface warpage limit .0020” (.05 mm)
Standard height 3.870” (98.3 mm)
Valve Seat Contacting width
In
Std .028" (.7 mm)
Limit .055" (1.4 mm)
Ex
Std .039" (1.0 mm)
Limit .071" (1.8 mm)
Valve Guide
Inner Diameter .2362-.2367" (6.0-6.012 mm)
Protrusion above head .689-.709" (17.5-18.0 mm)
Valve Margin thickness
In
Std .039" (1.0 mm)
Limit .031" (.8 mm)
Ex
Std .047" (1.2 mm)
Limit .031" (.8 mm)
Valve
Stem diameter In .2343-.2348" (5.950-5.965 mm)
Ex .2341-.2346" (5.945-5.960 mm)
Stem Oil clearance
Std
In .0014-.0024" (.035-.062 mm)
Ex .0016-.0026" (.040-.067 mm)
Limit .0059" (.15 mm)
Overall length
In 3.976" (101.0 mm)
Ex 3.984" (101.2 mm)
Valve Spring
Overall length
Std 1.654" (42.0 mm)
Limit 1.575" (40.0 mm)
Squareness
Inner
.075” (1.9 mm)