| MODEL | YAMAHA R1-Z 1990 - 1991 |
| Year | 1990 - 1991 |
| Engine Type | Two stroke, parallel twin cylinder |
| Displacement / Capacity | 247 cc / 15.1 cu in |
| Bore X Stroke | 56.4 x 50.5 mm |
| Compression Ratio | 6.4:1 |
| Cooling System | Liquid cooled |
| Max Power | 33.5 kW / 45 hp @ 9500 rpm |
| Max Torque | 3.7 kg-m @ 8500 rpm |
| Ignition | CDI |
| Induction | Carburetor |
| Start System | Electric |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 6 speed |
| Clutch | Wet multi-plate |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | — |
| Front Suspension | Telescopic |
| Rear Suspension | Swinging arm |
| Front Brakes | 2 x discs |
| Rear Brakes | Single disc |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | 755 mm / 29.7 in |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | 133 kg / 294 lbs |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 110/70-17 |
| Rear Tyre | 140/70-17 |
| FUEL SYSTEM | |
| Fuel Capacity | 17 Litres / 4.5 US gal |
| Fuel Consumption | — |
| Top Speed | — |
The R1-Z was Yamaha's liquid-cooled two-stroke 250 parallel-twin sport bike. It made about 45 hp through a six-speed gearbox and was aimed at riders wanting a light, high-revving sports machine with a twin-disc front brake. This page covers the 1990-91 model years.
