Honda CB 125


Make Model

Honda CB 125 Disc


1976 - 77


Four stroke, twin cylinder, OHC, 2 valve per cylinder


124 cc / 7.6 cu-in
Bore x Stroke 44 x 41mm
Cooling System Air cooled
Compression Ratio 7.4:1


2x Keihin 22mm slide type manual choke


Battery & coil
Starting Kick

Max Power

17 hp / 12.4 kW @ 11500 rpm

Max Torque

Clutch Multi-disc, wet


5 Speed
Final Drive Chain
Gear Ratio 5th 9.46  /  4th 11.10  /  3rd 13.72  /  2nd 17.81  / 1st  26.20

Front Suspension

Telescopic fork, 4.5 in wheel travel.

Rear Suspension

Swing arm, 2.6 in wheel travel.

Front Brakes

Single 240mm disc

Rear Brakes

130mm Drum

Front Tyre

2.50 -18

Rear Tyre

2.75 -18


133 kg / 295.4  lbs

Fuel Capacity 

10 Litres / 10.6 US gal

A bestseller for Honda in the early 1970s, the CB175 was designed to answer the criticisms of more sporting ride-to-workers who found the CD175 (introduced 1967-8) deficient as an adrenalin-rouser. Both were parallel twins but the CB had two carburettors, electric starting and five gears — which suggests what the CD specification was — and other assets such as a full cradle frame, two-leading-shoe front brake and a tachometer.

Power differential amounted to 3bhp, the respective figures being 16.5bhp/9,500rpm and 19.5bhp/ 10,000 rpm, the latter equivalent to 110bhp/litre which remains, in the 1980s, a creditable, not to say staggering, output.

Top speed for the CB was 80mph, at something over 10,000rpm. Both 175 models were sold concurrently, the CB at £60 over the 'cooking' version's price.

Sports CB175 twin had twin carburettors, abbreviated mudguards, smaller fuel tank and 2ls front brake