By model year
Yamaha YZ250
2015 to 2027
4 model-year records side by side. A row is compared only where manual pages print the value; spec-sheet figures are shown but not judged.
On the manual pages
8 different12 the same4 printed differently4 not compared
Different on the manual pages
The records are for different markets (2015: not stated; 2025: US version; 2026: US version; 2027: EU/AU identical). Figures can differ between markets, not only between years.
"Not compared" means fewer than two records have the value from a manual page; it says nothing about whether the bike changed. "Printed differently" marks descriptions (the fork, the oil, pressures with printed conversions) that the manuals word differently; read both before assuming a change.
| Spec | Manual pages | 2015 | 2025 | 2026 | 2027 |
|---|---|---|---|---|---|
| Stock front sprocket | Same on the manuals | 14TOwner's manual p. 2-2 | 14TOwner's manual p. 2-3 | 14TOwner's manual p. 2-3 | 14TOwner's manual p. 2-3 |
| Stock rear sprocket | Same on the manuals | 50TOwner's manual p. 2-2 | 50TOwner's manual p. 2-3 | 50TOwner's manual p. 2-3 | 50TOwner's manual p. 2-3 |
| Chain pitch | Same on the manuals | 520Owner's manual p. 2-7 | 520Owner's manual p. 2-7 | 520Owner's manual p. 2-7 | 520Owner's manual p. 2-7 |
| Stock chain links | Same on the manuals | Not yet verified | 114Owner's manual p. 2-7 | 114Owner's manual p. 2-7 | 114Owner's manual p. 2-7 |
| Stock final drive ratio | Same on the manuals | Not yet verified | 3.571 : 1Owner's manual p. 2-3 | 3.571 : 1Owner's manual p. 2-3 | 3.571 : 1Owner's manual p. 2-3 |
| Front rim | Different on the manuals | Not yet verified | 21 x 1.60Owner's manual p. 2-5 | 21 x 1.60Owner's manual p. 2-5 | 21x1.6Owner's manual p. 2-5 |
| Rear rim | Same on the manuals | Not yet verified | 19 x 2.15Owner's manual p. 2-5 | 19 x 2.15Owner's manual p. 2-5 | 19x2.15Owner's manual p. 2-5 |
| Front tire | Same on the manuals | 80/100-21 51MOwner's manual p. 2-2 | 80/100-21 51MOwner's manual p. 2-5 | 80/100-21 51MOwner's manual p. 2-5 | 80/100-21 51MOwner's manual p. 2-5 |
| Rear tire | Same on the manuals | 110/90-19 62MOwner's manual p. 2-2 | 110/90-19 62MOwner's manual p. 2-5 | 110/90-19 62MOwner's manual p. 2-5 | 110/90-19 62MOwner's manual p. 2-5 |
| Fork | Printed differently | Not yet verified | Telescopic forkOwner's manual p. 2-5 | Telescopic forkOwner's manual p. 2-5 | Telescopic fork, coil springOwner's manual p. 2-5 |
| Fork travel | Same on the manuals | 300 mm (11.8 in)Owner's manual p. 2-2 | 300 mm (11.8 in)Owner's manual p. 2-6 | 300 mm (11.8 in)Owner's manual p. 2-6 | 300 mm (11.8 in)Owner's manual p. 2-6 |
| Shock travel | Same on the manuals | 315 mm (12.4 in)Owner's manual p. 2-2 | 315 mm (12.4 in)Owner's manual p. 2-6 | 315 mm (12.4 in)Owner's manual p. 2-6 | 315 mm (12.4 in)Owner's manual p. 2-6 |
| Stock fork spring rate | Not comparedBlank in a record | Not yet verified | Not yet verified | Not yet verified | 4.4 N/mmOwner's manual p. 10-12 |
| Stock shock spring rate | Not comparedBlank in a record | Not yet verified | Not yet verified | Not yet verified | 50 N/mmOwner's manual p. 10-13 |
| Coolant capacity | Different on the manuals | 1200 ml (40.6 fl oz)Owner's manual p. 2-1 | 1180 ml (39.9 fl oz)Owner's manual p. 2-2 | 1180 ml (39.9 fl oz)Owner's manual p. 2-2 | 1180 ml (39.9 fl oz)Owner's manual p. 2-2 |
| Premix ratio | Same on the manuals | Not yet verified | 30:1Owner's manual p. 2-2 | 30:1Owner's manual p. 2-2 | 30:1Owner's manual p. 2-2 |
| Fuel capacity | Different on the manuals | 8 L (2.11 gal)Owner's manual p. 2-1 | 7 L (1.85 gal)Owner's manual p. 2-2 | 7 L (1.85 gal)Owner's manual p. 2-2 | 7 L (1.85 gal)Owner's manual p. 2-2 |
| Gearbox oil | Different on the manuals | Recommended brand: YAMALUBE SAE10W-40 API service SG type or higher JASO standard MA; Periodic oil change 0.75 L (0.66 Imp qt, 0.79 US qt); Total amount 0.80 L (0.70 Imp qt, 0.85 US qt)Owner's manual p. 2-1 | Motor oil SAE 10W-40 type SG or higher; Quantity (disassembled) 0.80 L (0.85 US qt, 0.70 Imp.qt); Quantity 0.75 L (0.79 US qt, 0.66 Imp.qt)Owner's manual p. 2-2 | Motor oil SAE 10W-40 type SG or higher; Quantity (disassembled) 0.80 L (0.85 US qt, 0.70 Imp.qt); Quantity 0.75 L (0.79 US qt, 0.66 Imp.qt)Owner's manual p. 2-2 | Not yet verified |
| Fork oil | Different on the manuals | Oil capacity 515.0 cm3 (18.16 Imp oz, 17.41 US oz); Oil grade Suspension oil "S1"Owner's manual p. 2-6 | Yamaha Suspension Oil S1; Quantity (left) 505.0 cm³ (17.07 US oz, 17.81 Imp.oz); Quantity (right) 505.0 cm³ (17.07 US oz, 17.81 Imp.oz)Owner's manual p. 2-6 | Yamaha Suspension Oil S1; Quantity (left) 505.0 cm³ (17.07 US oz, 17.81 Imp.oz); Quantity (right) 505.0 cm³ (17.07 US oz, 17.81 Imp.oz)Owner's manual p. 2-6 | Not yet verified |
| Brake fluid | Different on the manuals | DOT #4Owner's manual p. 2-7 | DOT 4Owner's manual p. 2-5 | DOT 4Owner's manual p. 2-5 | Not yet verified |
| Coolant type | Not comparedBlank in a record | High quality ethylene glycol antifreeze containing anti-corrosion for aluminum engineOwner's manual p. 3-6 | Not yet verified | Not yet verified | Not yet verified |
| Fuel octane | Not comparedBlank in a record | Premium unleaded gasoline only with a research octane number of 95 or higherOwner's manual p. 2-1 | Not yet verified | Not yet verified | Not yet verified |
| Tire pressure (off-road) | Printed differently | 100 kPa (15 psi) front and rearOwner's manual p. 2-2 | 100 kPa (1.00 kgf/cm², 15 psi) front and rear, measured on cold tiresOwner's manual p. 2-5 | 100 kPa (1.00 kgf/cm², 15 psi) front and rear, measured on cold tiresOwner's manual p. 2-5 | 100 kPa (15 psi) front and rearOwner's manual p. 2-5 |
| Chain slack | Printed differently | Not yet verified | 48.0–58.0 mm (1.89–2.28 in), on a maintenance standOwner's manual p. 2-7 | 48.0–58.0 mm (1.89–2.28 in), on a maintenance standOwner's manual p. 2-7 | 48-58 mm (1.89-2.28 in), on a maintenance standOwner's manual p. 2-7 |
| Spark plug and gap | Printed differently | NGK BR8EG, gap 0.5-0.6 mmOwner's manual p. 2-1 | NGK/BR8EG, gap 0.5–0.6 mm (0.020–0.024 in)Owner's manual p. 2-2 | NGK/BR8EG, gap 0.5–0.6 mm (0.020–0.024 in)Owner's manual p. 2-2 | NGK BR8EG, gap 0.5-0.6 mmOwner's manual p. 2-2 |
| Seat height | Different on the manuals | 976 mm (38.4 in)Owner's manual p. 2-1 | 975 mm (38.4 in)Owner's manual p. 2-1 | 975 mm (38.4 in)Owner's manual p. 2-1 | 975 mm (38.4 in)Owner's manual p. 2-1 |
| Wheelbase | Different on the manuals | 1446 mm (56.9 in)Owner's manual p. 2-1 | 1485 mm (58.5 in)Owner's manual p. 2-1 | 1485 mm (58.5 in)Owner's manual p. 2-1 | 1485 mm (58.5 in)Owner's manual p. 2-1 |
| Weight | Same on the manuals | 103 kg (227 lb)Owner's manual p. 2-1 | 103 kg (227 lb)Owner's manual p. 2-1 | 103 kg (227 lb)Owner's manual p. 2-1 | 103 kg (227 lb)Owner's manual p. 2-1 |