| MODEL | HONDA NS 125F 1985 |
| Year | 1985 |
| Engine Type | Two stroke, single cylinder, reed valve induction, ATAC exhaust chamber |
| Displacement / Capacity | 124.5 cc / 7.6 cu in |
| Bore X Stroke | 56 x 50.6 mm |
| Compression Ratio | 6.5:1 |
| Cooling System | Liquid cooled |
| Max Power | 18.6 kW / 25 hp @ 7000 rpm |
| Max Torque | 1.8 kgf-m / 13.0 lb-ft @ 8000 rpm |
| Ignition | Capacitor discharge electronic ignition |
| Induction | 26 mm Dell'Orto PHBH 26 FS carburettor |
| Start System | Kick |
| TRANSMISSION SPECS | |
| Lubrication | Separate oil lubrication |
| Gear Box | 6 Speed |
| Clutch | Wet multi-disc |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Double cradle, square-section steel tube |
| Front Suspension | 35 mm Marzocchi telescopic fork, non-adjustable |
| Rear Suspension | Pro-Link monoshock, adjustable Marzocchi hydraulic damper |
| Front Brakes | Single 254 mm disc, 2 piston caliper |
| Rear Brakes | Drum |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | 780 mm / 30.7 in |
| Wheelbase | 1350 mm / 53.1 in |
| Ground Clearance | — |
| Dry Weight | 115 kg / 253 lbs |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 3.25-16 |
| Rear Tyre | 3.50-18 |
| FUEL SYSTEM | |
| Fuel Capacity | 14.5 Litres / 3.8 US gal |
| Fuel Consumption | — |
| Top Speed | — |
The NS 125F was launched by Honda Italia at the December 1984 Bologna show and sold from April 1985, a sharp break from the plain four-stroke 125s Honda had offered in Italy. Its reed-valve, liquid-cooled two-stroke used Honda's ATAC exhaust chamber to boost midrange, in a square-tube cradle frame with Italian Marzocchi suspension and Grimeca brakes. It was a strong seller in Italy, though UK testers felt the 12 bhp learner-restricted version was overpriced.
