Yamaha BIG BEAR 400 Owner's Manual page 161

MODEL
Final gear oil:
Type
Quantity
Differential gear oil:
Type
Quantity
Air filter:
Fuel:
Type
Tank capacity
Reserve amount
Carburetor:
Type/manufacturer
Spark plug:
Type/manufacturer
Gap
Clutch type:
SAE 80 API GL-4 Hypoid gear oil
0.23 L (0.20 lmp qt, 0.24 US qt)
SAE 80 API GL-4 Hypoid gear oil
0.35 L (0.31 Imp qt, 0.37 US qt)
Dry element
UNLEADED GASOLINE ONLY
15.0 L (3.30 Imp gal, 3.96 US gal)
4.0 L (0.88 Imp gal, 1.06 US gal)
BSR33 / MIKUNI
DR8EA / NGK
0.6–0.7 mm (0.024–0.028 in)
Wet, centrifugal automatic
10-3
YFM400F