ENGINE SPECIFICATIONS AND WEAR TOLERANCES

TM 5-3740-214-14

ENGINE SPECIFICATIONS AND WEAR TOLERANCES (Continued)

Crankpin

New Diameter .......................................................................................................................... 1.186 in. (30.14 mm)

Max Out of Round.................................................................................................................. 0.0005 in. (0.013 mm)

Max Taper ............................................................................................................................... 0.001 in. (0.025 mm)

Camshaft

Run Clear. on Pin ............................................................................................... 0.0005/0.003 in. (0.013/0.076 mm)

End Play ...................................................................................................................0.005/0.010 in. (0.13/0.25 mm)

Connecting Rod

Big End Max Diameter ........................................................................................................... 1.1885 in. (30.20 mm)

Rod-Crankpin Max Clear........................................................................................................ 0.0035 in. (0.089 mm)

Small (Pin) End-View Diameter............................................................................................ 0.62565 in. (15.90 mm)

Rod to Pin Clear ............................................................................................... 0.0006/0.0011 in. (0.015/0.028 mm)

Piston

Thrust Face-Max Wear Diameter ........................................................................................... 2.9305 in. (74.47 mm)

Thrust Face-Bore Clear.............................................................................................0.006/0.008 in. (0.15/0.20 mm)

Ring-Max Side Clear.................................................................................................................. 0.006 in. (0.15 mm)

Ring-End Gap in New Bore .......................................................................................0.007/0.017 in. (0.18/0.43 mm)

Ring-End Gap in Used Bore ....................................................................................................... 0.027 in. (0.69 mm)

Valve-Intake

Valve-Tappet Cold Clear..............................................................................................0.006/0.008 in. (0.15/20 mm)

Valve Lift (Zero Lash) .............................................................................................................. 0.2778 in. (7.06 mm)

Stem to Guide Max Wear Clear ............................................................................................. 0.0045 in. (0.114 mm)

Specification

Valve-Exhaust

Valve-Tappet Cold Clear...........................................................................................0.015/0.017 in. (0.38/0.43 mm)

Valve Lift (Zero Lash) .............................................................................................................. 0.2542 in. (6.46 mm)

Stem to Guide Max Wear Clear ................................................................................................. 0.006 in. (0.15 mm)

Tappet

Clear. in Guide........................................................................................................0.005/0.002 in. (0.013/0.51 mm)

Ignition

Spark Plug Gap-Gasoline .......................................................................................................... 0.025 in. (0.64 mm)

Spark Plug Gap-Gas .................................................................................................................. 0.018 in. (0.46 mm)

Spark Plug Gap (Shielded) ........................................................................................................ 0.020 in. (0.51 mm)

Breaker Point Gap ..................................................................................................................... 0.020 in. (0.51 mm)

Trigger Air Gap (Breakerless) ...................................................................................0.005/0.010 in. (0.13/0.25 mm)

Spark Run BTDC ................................................................................................................................................ 20°

Spark Retard.............................................................................................................................3°BTDC (Acr-None)

Torque Values

Spark Plug (ft-lbs) ................................................................................................................. 18-22 (2.49/3.04 kg m)

Cylinder Head ...............................................................................................................15-20 ft-lbs (2.07/2.77 kg m)

Connecting Rod ......................................................................................................................200 in-lbs (2.30 kg m)

Flywheel Nut .................................................................................................................50-60 ft-lbs (6.92/8.30 kg m)

Fuel Systems

Fuel Tank ....................................................................................................................................... 2.7 gal (10.22 L)

Carburetor Idle Jet Setting .................................................................................................. Back the idle needle out

1-1/4 turns from full closed position

Carburetor Operational Jet Setting ...............................................................................................Back the main fuel

needle out 2 full turns from full closed position

Carburetor Float Setting.......................................................................... 11/64 in. + 1/32 in. (0.044 mm ± 0.008 mm)

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