| MODEL | HONDA TL 125 BIALS 1973 - 1979 |
| Year | 1973 - 1979 |
| Engine Type | Four stroke, single cylinder, SOHC, 2 valves |
| Displacement / Capacity | 122 cc / 7.4 cu in |
| Bore X Stroke | 56.0 x 49.5 mm / 2.20 x 1.95 in |
| Compression Ratio | 8.0:1 |
| Cooling System | Air cooled |
| Max Power | 6.6 kW / 9.3 hp @ 8000 rpm |
| Max Torque | — |
| Ignition | Flywheel magneto |
| Induction | Mikuni VN24SH carburettor |
| Start System | Kick |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 5-speed, constant mesh |
| Clutch | Wet, multi-plate |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Steel tubular |
| Front Suspension | Oil-damped telescopic fork |
| Rear Suspension | Swingarm, twin oil-damped shocks, 5-way preload adjustable |
| Front Brakes | Drum |
| Rear Brakes | Drum |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | — |
| Wet Weight | 106 kg / 233.7 lbs |
| WHEEL SPECS | |
| Front Tyre | 2.75-21 |
| Rear Tyre | 4.00-18 |
| FUEL SYSTEM | |
| Fuel Capacity | 4.5 Litres / 1.2 US gal |
| Fuel Consumption | — |
| Top Speed | — |
The TL125 Bials was Honda's first proper production trials bike, launched in Japan early in 1973 and sold in the US and Europe as the TL125. It used the SL125 SOHC single with lower compression for soft, tractable low-speed pull, a high-clearance frame and a 21-inch front wheel, but kept lights and a seat so it could be ridden on the road. Its success helped start Honda's serious trials programme, with Sammy Miller involved from 1974.
