Yamaha YZ125X 2021 specs
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| Clutch | O-ring chain |
| Displacement | 124.00 ccm (7.57 cubic inches) |
| Engine Type | Reed-valve-inducted |
| Engine Details | Single cylinder, two-stroke |
| Compression | 7.1:1 |
| Bore X Stroke | 54.0 x 54.5 mm (2.1 x 2.1 inches) |
| Fuel System | Carburettor. Mikuni TMX 38 |
| Ignition | CDI |
| Lubrication System | Premix |
| Cooling System | Liquid |
| Gearbox | 6-speed |
| Transmission Type Final Drive | Chain |
| Front Wheel Travel | 300 mm (11.8 inches) |
| Frame Type | Semi-double cradle aluminium frame |
| Rake | 26.0° |
| Front Brakes | Single disc. Hydraulic. |
| Rear Brakes | Single disc. Hydraulic. |
| Front Brakes Diameter | 270 mm (10.6 inches) |
| Rear Brakes Diameter | 245 mm (9.6 inches) |
| Front Suspension | KYB® Speed-Sensitive System inverted fork; fully adjustable |
| Rear Suspension | Fully adjustable single shock |
| Front Tyre | 90/90-21 |
| Rear Tyre | 100/90-18 |
| Rear Wheel Travel | 315 mm (12.4 inches) |
| Trail | 109 mm (4.3 inches) |
| Wheels | Dunlop® Geomax AT81 tires |
| Fuel Capacity | 8.00 litres (2.11 gallons) |
| Ground Clearance | 363 mm (14.3 inches) |
| Oil Capacity | 0.70 litres (0.05 quarts) |
| Overall Height | 1,295 mm (51.0 inches) |
| Overall Length | 2,137 mm (84.1 inches) |
| Overall Width | 825 mm (32.5 inches) |
| Seat Height | 975 mm (38.4 inches) If adjustable, lowest setting. |
| Weight Incl Oil Gas Etc | 94.0 kg (207.2 pounds) |
| Color Options | Blue/white |
| Starter | Kick |
| Factory Warranty | 30 Day Limited Factory Warranty |
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