Yamaha YFM25BX Owner's Manual page 139

With oil filter element removal:
1.60 L (1.69 US qt) (1.41 Imp.qt)
Final gear oil:
Type:
SAE80 API GL-4 Hypoid gear oil
Quantity:
0.25 L (0.26 US qt) (0.22 Imp.qt)
Air filter:
Air filter element:
Dry element
Fuel:
Recommended fuel:
Unleaded gasoline only
Fuel tank capacity:
12.0 L (3.17 US gal) (2.64 Imp.gal)
Fuel reserve amount:
1.6 L (0.42 US gal) (0.35 Imp.gal)
Carburetor:
Manufacturer:
MIKUNI
Type x quantity:
BSR33 x 1
Spark plug (s):
Manufacturer/model:
NGK/DR7EA
Spark plug gap:
0.6–0.7 mm (0.024–0.028 in)
Clutch:
Clutch type:
Wet, centrifugal automatic
Transmission:
Primary reduction system:
Spur gear
Primary reduction ratio:
73/22 (3.318)
Secondary reduction system:
Shaft drive
Secondary reduction ratio:
19/18 × 46/11 (4.414)
Transmission type:
Constant mesh 5-speed.forward, 1-speed.reverse
Operation:
Left foot operation
Gear ratio:
1st:
34/12 (2.833)
2nd:
34/19 (1.789)
3rd:
29/22 (1.318)
4th:
26/25 (1.040)
5th:
23/28 (0.821)
Reverse gear:
73/22 × 34/12 × 19/18 (9.924)
Chassis:
Frame type:
Steel tube frame
Caster angle:
4.0 °
10-2
10