| MODEL | YAMAHA RZ 125 NAKED 1985 |
| Year | 1985 |
| Engine Type | Two-stroke, single cylinder |
| Displacement / Capacity | 123 cc / 7.5 cu in |
| Bore X Stroke | 56 x 50 mm |
| Compression Ratio | 6.4:1 |
| Cooling System | Liquid cooled |
| Max Power | 15.5 kW / 20 hp @ 9500 rpm |
| Max Torque | 16 Nm / 1.6 kgf-m @ 9250 rpm |
| Ignition | Hitachi CDI |
| Induction | 24 mm Mikuni carburetor |
| Start System | Kick |
| TRANSMISSION SPECS | |
| Lubrication | Autolube |
| Gear Box | 6 speed |
| Clutch | — |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | — |
| Front Suspension | 32 mm telescopic forks |
| Rear Suspension | Monocross linkage, 6-way preload adjustment |
| Front Brakes | Single 245 mm disc |
| Rear Brakes | 130 mm drum |
| DIMENSION SPECS | |
| Overall Length | 1990 mm / 78.3 in |
| Overall Width | 735 mm / 28.9 in |
| Overall Height | 1190 mm / 46.8 in |
| Seat Height | 775 mm / 30.5 in |
| Wheelbase | 1295 mm / 50.9 in |
| Ground Clearance | 185 mm / 7.2 in |
| Dry Weight | — |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 2.75-18-4PR |
| Rear Tyre | 3.00-18-6PR |
| FUEL SYSTEM | |
| Fuel Capacity | 13 Litres / 3.4 US gal |
| Fuel Consumption | — |
| Top Speed | — |
A naked (unfaired) version of the liquid-cooled 125 two-stroke sports bike, sharing the 123 cc single, six-speed box, front disc and Monocross rear end of the 125LC. The source gives no details on how it differs beyond the lack of fairing.
