Honda CB 125T


Make Model

Honda CB 125T


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

15 hp / 10.9 kW @ 10500 rpm

Max Torque

1.05 kgf-m / 7.5 lb-ft @ 9000 rpm
Clutch Multi-disc, wet


5 Speed
Final Drive Chain

Front Suspension

31mm oil-damped telescopic forks

Rear Suspension

Pivoted fork, 2 coil spring, hydraulically damped, 5 preload settings

Front Brakes

Single 240mm disc

Rear Brakes

130mm drum

Front Tyre

2.75 -18

Rear Tyre

3.00 -18

Dry Weight

114 kg / 230 lbs

Fuel Capacity 

11.5 Litres / 3.0 US gal

Top Speed

107.8 km/h / 67 mph

When the compiler was asked to advise on a replacement as office hack for a troublesome 250 two-stroke from eastern Europe he suggested that a 125 Honda might be faster, more economical, more reliable, and possibly a little less expensive.

This incident occurred in 1972, in the first year of the 125S. The model has continued in the Honda range, with minor changes to specification and suffix letter, and seems likely to become more important in the UK during the ^Sec-restricted learner phase.

A 1976 125J is representative of the line. Though more sporting than the S, and with its role as commuter bike presumably delegated to the newly introduced pushrod ohv CG125, the 125J showed few large-scale changes compared with the original. Most obvious was the front disc brake, which replaced a 6in-diameter drum unit.

The handlebar was changed for a flatter type, the exhaust silencer enlarged and re-angled, the fuel tank reshaped. Internally, the cylinder head had been reworked and the carburettor choke size increased by 2mm to raise power by 1 -2 bhp, to complement revised gear ratios. The effect was to make the J a little faster, compared with the earlier model, but more sluggish in the critical 0-40 mph zone. Fuel consumption remained outstanding, with 80-100mpg available depending on riding methods.