| MODEL | YAMAHA ST 225 B 1997 |
| Year | 1997 |
| Engine Type | Four stroke, single cylinder, SOHC |
| Displacement / Capacity | 223 cc / 13.6 cu in |
| Bore X Stroke | 70 x 58 mm |
| Compression Ratio | 9.5:1 |
| Cooling System | Air cooled |
| Max Power | 14.9 kW / 20 hp @ 8000 rpm |
| Max Torque | 1.9 kgf-m / 13.7 lb-ft @ 7000 rpm |
| Ignition | CDI |
| Induction | 34 mm Mikuni BST34 carburettor |
| Start System | Kick |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 6 Speed |
| Clutch | — |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | — |
| Front Suspension | Telescopic fork, 226 mm wheel travel |
| Rear Suspension | Swingarm, single shock, rebound adjustable, 145 mm wheel travel |
| Front Brakes | Single 220 mm disc |
| Rear Brakes | Single 110 mm drum |
| DIMENSION SPECS | |
| Overall Length | 2030 mm / 79.9 in |
| Overall Width | 800 mm / 31.5 in |
| Overall Height | 1140 mm / 44.9 in |
| Seat Height | 795 mm / 31.3 in |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | 123 kg / 271 lbs |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 2.75-19 |
| Rear Tyre | 120/80-18 |
| FUEL SYSTEM | |
| Fuel Capacity | 8.3 Litres / 2.2 US gal |
| Fuel Consumption | — |
| Top Speed | — |
The ST225 Bronco is a retro-styled scrambler built on the frame and engine of the Serow 225, with chrome tank, headlight, instruments and fenders in the spirit of the 1968 DT-1. It was aimed at riders who wanted classic looks that still worked on gravel and trails as well as on the road.
