1.12
Section 1
Safety and General Information
Piston Thrust Face-to-Cylinder Bore Running Clearance - New
CH11-14 .................................................................................................... 0.041/0.044 mm (0.0016/0.0017 in.)
CH15, CH16 .............................................................................................. 0.031/0.043 mm (0.0012/0.0016 in.)
Retractable Starter
Center Screw Torque ...................................................................................... 7.4-8.5 N·m (65-75 in. lb.)
Throttle/Choke Controls
Governor Control Lever Fastener Torque .................................................. 9.9 N·m (88 in. lb.)
Speed Control Bracket Assembly Fastener Torque² .................................. 7.3-10.7 N·m (65-95 in. lb.)
Valve Cover/Rocker Arms
Valve Cover Fastener Torque² ...................................................................... 7.3-10.7 N·m (65-95 in. lb.)
Rocker Arm I.D.
New ........................................................................................................... 15.837/16.127 mm (0.63/0.64 in.)
Max. Wear Limit ...................................................................................... 16.13 mm (0.640 in.)
Rocker Shaft O.D.
New ........................................................................................................... 15.90/15.85 mm (0.63 in.)
Max. Wear Limit ...................................................................................... 15.727 mm (0.619 in.)
Valves and Valve Lifters
Hydraulic Valve Lifter to Crankcase Running Clearance ........................ 0.0124/0.0501 mm (0.0005/0.0020 in.)
Intake Valve Stem-to-Valve Guide Running Clearance ........................... 0.038/0.076 mm (0.0015/0.0030 in.)
Exhaust Valve Stem-to-Valve Guide Running Clearance ........................ 0.050/0.088 mm (0.0020/0.0035 in.)
Intake Valve Guide I.D.
New ........................................................................................................... 7.038/7.058 mm (0.2771/0.2779 in.)
Max. Wear Limit ...................................................................................... 7.134 mm (0.2809 in.)
Exhaust Valve Guide I.D.
New ........................................................................................................... 7.038/7.058 mm (0.2771/0.2779 in.)
Max. Wear Limit ...................................................................................... 7.159 mm (0.2819 in.)
Valve Guide Reamer Size
STD ............................................................................................................. 7.048 mm (0.2775 in.)
0.25 mm O.S. ............................................................................................. 7.298 mm (0.2873 in.)
Intake Valve Minimum Lift ........................................................................... 8.96 mm (0.353 in.)
Exhaust Valve Minimum Lift ....................................................................... 9.14 mm (0.360 in.)
Nominal Valve Seat Angle ............................................................................ 45°
2
For self-tapping (thread-forming) fasteners, the higher torque value is for installation into a new cored (non-threaded) hole.
The lower torque value is for installation into a used or threaded hole.
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