2025 Yamaha YZ125 Specifications
| Manufacturer | Yamaha |
| Model Year | 2025 |
| Model | YZ125 |
| Model Code | YZ125SL |
| Stock Number | 2025174 |
| Color | Team Yamaha Blue |
| Brakes | Front: Hydraulic disc, 270 mm Rear: Hydraulic disc, 240 mm |
| Tires | Front: 80/100-21 Bridgestone Battlecross X20F Rear: 100/90-19 Bridgestone Battlecross X20 |
| Length | 84.1 in. (213.7 cm) |
| Height | 51.0 in. (129.5 cm) |
| Width | 32.5 in. (82.6 cm) |
| Weight | Wet: 209 lb. (94.8 kg) |
| Ground Clearance | Max. 14.4 in. (36.6 cm) |
| Wheelbase | 56.9 in. (144.5 cm) |
| Seat Height | 38.6 in. (98.0 cm) |
| Transmission | Constant-mesh 6-speed |
| Final Drive | Chain |
| Engine | 2-stroke; reed-valve inducted |
| Cooling | Liquid |
| Displacement | 125 cc |
| Bore x Stroke | 54.0 mm x 54.5 mm |
| Compression Ratio | 8.2 ~ 10.1:1 |
| Clutch | Multiplate wet |
| Carburetion | Hitachi Astemo Keihin PWK38S |
| Fuel Capacity | 1.8 gal. (6.8 L) |
| Front Suspension | KYB Speed-Sensitive System inverted fork, fully adjustable, 11.8 in. (30.0 cm) travel |
| Rear Suspension | KYB single shock, fully adjustable, 12.4 in. (31.5 cm) travel |
| Rake | 26° caster angle |
| Trail | 4.3 in. (10.9 cm) |
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