The Honda CD175 was a 174 cc (10.6 cu in) Honda motorcycle made from 1967 to 1979. It was the touring model in Honda's 175 cc motorcycle lineup that also included the sportier CB175 and the off road CL175 version. The CD175 shared many components and design elements in common with the contemporary CD125 and SS125 models from Honda including stamped "t-bone" frame, swingarm, double seat, and electrics among other things. It had electric start, except in the UK, turn signals, and mirrors. The "sloper" engine used on earlier models was an evolutionary version of the older Honda CB160 power plant and contained many of the same components including most of the castings and internal items.
The CD175 had a 360° crankshaft, wasted spark ignition, single carburetor, a parallel twin high revving engine, 16" wheels and a 100 mph (160 km/h) speedometer. Each connecting rod big end had roller bearings. In 1979 it was replaced by Honda CD185.
Years of Production 1967–1979
1967 models (product code 237) began at serial number CD175-1000001. Also known as the CA175, CD175A, or CD175 K0 just over 17000 of these units were built and distributed worldwide although only to commonwealth countries. Styling and appearance on these early CD models was similar to the larger CB450K0 "Black Bomber", especially the British version which received a set of low-rise handlebars (as well as no electric start and different winker positions).
1968 models (also product code 237) began at serial number CD175-10017136 and incorporated changes that allowed for export to the USA. These changes included a different fuel tank with larger, less pointy chrome covers and knee pads, larger more bulbous battery and tool covers, upgraded lighting and signals/switches, and a hybrid welded-tube/stamped frame. The engine remained unchanged from 1967.
1969 "K3" models (product code 302) introduced the vertical engine and all-tube frame and some smaller body work changes that continued until the end of production in 1979.
Displacement: 174 cc
1967 to 1968:4 stroke 360 degree parallel twin; air cooled; single overhead cam (chain driven); cylinders inclined 30 degrees forward from vertical ("sloper" engine); 9.0:1 compression ratio; max 17 bhp @ 10,500 rpm.
1969 to 1979: 4 stroke 360 degree parallel twin; air cooled; single overhead cam (chain driven); vertical cylinders ("vertical" engine); 9.0:1 compression ratio; max 15 bhp @ 10,000 rpm
Fuel system: Single 22 mm Carburetor, cylindrical slide type (Keihin Seiki PW-22)
Gearbox: 4 speed, wet clutch (1st-2.769; 2nd-1.778; 3rd-1.318; 4th-1.040); Gear-driven primary drive (3.70:1); chain-driven final drive (2.470:1)
Electrics: 6 volt (battery ignition)
Exhaust: 2 into 2 with baffle type silencers.