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1.8
Section 1
Safety and General Information
General Specifications¹
Power (@ 3600 RPM, corrected to SAE J1995)
CH18............................................................................................................................ 13.4 kW (18 HP)
CH20............................................................................................................................ 14.9 kW (20 HP)
CH22/23 ....................................................................................................................... 16.4 kW (22 HP)
CH25, CH730............................................................................................................... 18.4 kW (25 HP)
CH26............................................................................................................................ 19.4 kW (26 HP)
CH740 .......................................................................................................................... 20.1 kW (27 HP)
CH745 .......................................................................................................................... 20.9 kW (28 HP)
Peak Torque
CH18 - @ 2200 RPM ................................................................................................... 44.4 N·m (32.8 ft. lb.)
CH20 - @ 2600 RPM ................................................................................................... 44.2 N·m (32.6 ft. lb.)
CH22/23 - @ 2200 RPM .............................................................................................. 51.7 N·m (38.2 ft. lb.)
CH25, CH730 - @ 2800 RPM ...................................................................................... 54.1 N·m (39.9 ft. lb.)
CH26 - @ 2800 RPM ................................................................................................... 54.2 N·m (40.0 ft. lb.)
CH740 - @ 3000 RPM ................................................................................................. 57.9 N·m (42.7 ft. lb.)
CH745 - @ 2200 RPM ................................................................................................. 60.7 N·m (44.8 ft. lb.)
Bore
CH18, CH20, CH22 (624 cc) ........................................................................................ 77 mm (3.03 in.)
CH22/23 (674 cc) ......................................................................................................... 80 mm (3.15 in.)
CH25, CH26, CH730-745.............................................................................................83 mm (3.27 in.)
Stroke .................................................................................................................................67 mm (2.64 in.)
Displacement
CH18, CH20, CH22 (624 cc) ........................................................................................ 624 cc (38 cu. in.)
CH22/23 (674 cc) ......................................................................................................... 674 cc (41 cu. in.)
CH25, CH26, CH730-745.............................................................................................725 cc (44 cu. in.)
Compression Ratio
CH18, CH20, CH22/23................................................................................................. 8.5:1
CH25, CH26, CH730-745.............................................................................................9.0:1
Dry Weight
CH18, CH20, CH22/23................................................................................................. 41 kg (90 lb.)
CH25, CH26, CH730-745.............................................................................................43 kg (94 lb.)
Oil Capacity (with filter)
CH18, CH20, CH22/23, CH25, CH26, CH730-745 ...................................................... 1.9 L (2.0 U.S. qt.)
Angle of Operation - Maximum (At Full Oil Level) All Directions ......................................... 25°
Blower Housing and Sheet Metal
M5 Fasteners Torque..........................................................................................................4.0 N·m (35 in. lb.)
M6 Fasteners Torque..........................................................................................................6.8 N·m (60 in. lb.)
Rectifier-Regulator Fastener Torque ................................................................................... 4.0 N·m (35 in. lb.)
¹Values are in Metric units. Values in parentheses are English equivalents. Lubricate threads with engine oil prior
to assembly.