Specs compared
Yamaha YZ125 2027 vs Yamaha YZ250 2027
Motocross, stock specs side by side. Each value names the page it came from; a blank on either side stays blank.
Printed differently: engine, stock gearing, final drive ratio, rear tire, coolant capacity, seat height and weight. The same on both: chain pitch, front tire, fork travel, shock travel and premix ratio. Checked 28 Sep 2026.
| Spec | Yamaha YZ125 2027 | Yamaha YZ250 2027 |
|---|---|---|
| EnginePrinted differently | 125cc 2T | 249cc 2T |
| Stock gearingPrinted differently | 13T / 49TOwner's manual p. 2-3 | 14T / 50TOwner's manual p. 2-3 |
| Final drive ratioPrinted differently | 3.769 : 1Owner's manual p. 2-3 | 3.571 : 1Owner's manual p. 2-3 |
| Chain pitchSame | 520Owner's manual p. 2-7 | 520Owner's manual p. 2-7 |
| Front tireSame | 80/100-21 51MOwner's manual p. 2-5 | 80/100-21 51MOwner's manual p. 2-5 |
| Rear tirePrinted differently | 100/90-19 57MOwner's manual p. 2-5 | 110/90-19 62MOwner's manual p. 2-5 |
| Fork travelSame | 300 mm (11.8 in)Owner's manual p. 2-6 | 300 mm (11.8 in)Owner's manual p. 2-6 |
| Shock travelSame | 315 mm (12.4 in)Owner's manual p. 2-6 | 315 mm (12.4 in)Owner's manual p. 2-6 |
| Premix ratioSame | 30:1Owner's manual p. 2-2 | 30:1Owner's manual p. 2-2 |
| Coolant capacityPrinted differently | 930 ml (31.4 fl oz)Owner's manual p. 2-2 | 1180 ml (39.9 fl oz)Owner's manual p. 2-2 |
| Seat heightPrinted differently | 980 mm (38.6 in)Owner's manual p. 2-1 | 975 mm (38.4 in)Owner's manual p. 2-1 |
| WeightPrinted differently | 96 kg (212 lb)Owner's manual p. 2-1 | 103 kg (227 lb)Owner's manual p. 2-1 |
Each value shows where it came from. The bike pages list the document, page and date checked. “Printed differently” only says the two documents print different figures; it is not a judgement of either bike.
Stock sizes at MotoSport. Yamaha YZ125: 520 chains · Front tires 80/100-21 · Rear tires 100/90-19. Yamaha YZ250: 520 chains · Front tires 80/100-21 · Rear tires 110/90-19. These are affiliate links: we may earn a commission, at no cost to you, and it never changes the specs. Affiliate disclosure.