Specifications

NOTE: All dimensions are in inches and millimeters unless noted.

Model HH80 HH100 HH120

U.S. Metric U.S. Metric U.S. Metric

Displacement 23.7 384.4cc 23.7 284.4cc 27.66 453.4 cc

Stroke 2-3/4'’ 69.85mm 2-3/4'’ 69.85mm 2-7/8'’ 73.025mm

Bore 3.3120 84.125 3.3120 84.125 3.500 88.900mm

3.3130 84.150 3.3130 84.150 3.501 88.925mm

Timing Dimension TDC-Start TDC-Start TDC-Start

.095 Run 2.41 .095 Run 2.41 .095 Run 2.41mm

Point Gap .020 .508 .020 .508 .020 .508

Spark Plug Gap .028 .711 .028 .711 .028 .711mm

.033 .838 .033 .838 .033 .838mm

Valve Clearance Intake .010 .254 .010 .254 .010 .254mm

Exhaust .020 .508 .020 .508 .020 .508mm

Valve Seat Angle 46° 46° 46°

Valve Seat Width .042 .042 .042 1.067 .042 1.067mm

.052 .052 .052 1.321 .052 1.321mm

Valve Face Angle 45° 45° 45° 45° 45° 45°

Valve Face Width .089 2.261 .089 2.261 .089 2.261

.099 2.515 .099 2.515 .099 2.515

Valve Lip Width .06 1.524 .06 1.524 .06 1.524

Valve Spring Free Length 1.885 47.879 1.885 47.879 1.885 47.879

Valve Guides STD Diameter .312 7.925 .312 7.925 .312 7.925

.313 7.950 .313 7.950 .313 7.950

Valve Guides Over-Size Dimensions .343 8.712 .343 8.712 .343 8.712

.344 8.738 .344 8.738 .344 8.738

Dia. Crankshaft Conn. Rod Journal 1.3750 34.925 1.3750 34.925 1.3750 34.925

1.3755 34.938 1.3755 34.938 1.3755 34.938

Maximum Conn. Rod Dia.Crank Bearing Maximum Maximum Maximum

1.3765 34.963 1.3765 34.963 1.3765 34.963

Shaft Seat Dia. for Roller Bearings 1.1865 30.137 1.1865 30.137 1.1865 30.137

1.1870 30.150 1.1870 30.150 1.1870 30.150

Crankshaft End Play None None None

Piston Diameter 3.3080 84.023 3.3080 84.023 3.4950 88.773

3.3100 84.074 3.3100 84.074 3.4970 88.824