| Attribute | Value |
| General |
| Production from | 2006 year |
| Make | Yamaha |
| Model | Yamaha TT-R90 |
| Category | Enduro / offroad |
| Engine and transmission |
| Engine type | Single cylinder, four-stroke |
| Valves per cylinder | Add |
| Fuel system | Carburettor. Mikuni TMX38 |
| Engine details | Add |
| Displacement | 89 cm³ |
| Power | 4 kw |
| Max RPM | Add |
| Fuel consumption | Add |
| Cooling system | Liquid |
| Transmission type,final drive | Chain |
| Torque | 6.1 Nm |
| Bore | 47 mm |
| Stroke | 51.8 mm |
| Gearbox | 5-speed |
| Greenhouse gases | Add |
| Fuel control | Single Overhead Cams (SOHC) |
| Emission details | Add |
| Driveline | Add |
| Ignition | CDI |
| Clutch | Wet, multiple-disc |
| Lubrication system | Premix |
| Compression | 8.5:1 |
| Exhaust system | Add |
| Chassis |
| Front suspension | Telescopic fork |
| Rear suspension | Swinging arm (monocross) |
| Front brakes | Expanding brake (drum brake) |
| Rear brakes | Expanding brake (drum brake) |
| Diameter | 110 mm |
| Frame type | Add |
| Front tyre | 70/90-M17 |
| Rear tyre | 90/90-M14 |
| Seat | Add |
| Wheels | Add |
| Front wheel travel | 110 mm |
| Rear wheel travel | 125 mm |
| Trail | Add |
| Rake (fork angle) | Add |
| Other |
| Battery capacity | Add |
| Starter | Kick |
| Color options | Add |
| Carrying capacity | Add |
| Light | Add |
| Instruments | Add |
| Electrical Voltage | Add |
| Dimensions |
| Wheelbase | 1,040 mm |
| Kerb weight | Add |
| Dry weight | 60 kg |
| Power/weight ratio | 0.0667 |
| Overall height | 865 mm |
| Overall length | 1,525 mm |
| Overall width | 605 mm |
| Seat height | 625 mm |
| Alternate seat height | Add |
| Ground clearance | 172 mm |
| Front percentage of weight | Add |
| Rear percentage of weight | Add |
| Performance |
| Top speed | Add |
| Acceleration 0-100 km/h | Add |
| Length | Add |
| Reserve fuel capacity | Add |
| Fuel capacity | 8 l |
| Oil capacity | Add |
| Width | Add |
| Height | Add |