Yamaha YFM400AS Owner's Manual page 171

Final gear case oil:
Type
Quantity:
Periodic oil change
Radiator capacity (including all routes):
Air filter:
Fuel:
Type
Fuel tank capacity
Fuel reserve amount
Carburetor:
Type/quantity
Manufacturer
Model
SAE 80 API GL-4 Hypoid gear oil
0.19 L (0.17 Imp qt, 0.20 US qt)
1.3 L (1.2 Imp qt, 1.4 US qt)
Wet element
UNLEADED GASOLINE ONLY
15 L (3.30 lmp gal, 3.96 US gal)
4.5 L (0.99 lmp gal, 1.19 US gal)
BSR33 / 1
MIKUNI
10-3
YFM400A