Yamaha BIG BEAR 250 YFM25BZ Owner's Manual page 132

Type:
SAE 5W-30, 10W-30, 10W-40, 15W-40, 20W-40 or 20W-
50
0 10 30
SAE 5W-30
SAE 10W-30
–20 –10 0
Recommended engine oil grade:
API service SG type or higher, JASO standard MA
Engine oil quantity:
Without oil filter element removal:
1.50 L (1.59 US qt, 1.32 Imp.qt)
10
With oil filter element removal:
1.60 L (1.69 US qt, 1.41 Imp.qt)
Final gear oil:
Type:
SAE 80 API GL-4 Hypoid gear oil
Quantity:
0.25 L (0.26 US qt, 0.22 Imp.qt)
50 70 90 110
SAE 10W-40
SAE 15W-40
SAE 20W-40
SAE 20W-50
10 20 30 40
Air filter:
Air filter element:
Dry element
Fuel:
Recommended fuel:
130 ˚F
YFM250Z Unleaded gasoline only
YFM25BZ Regular 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:
Type × quantity:
BSR33 x 1
Spark plug (s):
Manufacturer/model:
50 ˚C
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)
10-2