Yamaha RHINO 660 Owner's Manual page 146

Final gear case oil:
Type
Quantity:
Differential gear case oil:
Type
Quantity:
Radiator capacity (including all routes):
Air filter:
Fuel:
Type
Fuel tank capacity
Carburetor:
Type/quantity
Manufacturer
Spark plug:
Type/manufacturer
Spark plug gap
Clutch type:
Model
SAE80 API GL-4 Hypoid gear oil
0.25 L (0.22 Imp qt, 0.26 US qt)
SAE80 API GL-4 Hypoid gear oil
0.32 L (0.28 Imp qt, 0.34 US qt)
2.50 L (2.20 Imp qt, 2.64 US qt)
Wet element
UNLEADED GASOLINE ONLY
30.0 L (6.60 lmp gal, 7.93 US gal)
BSR42/1
MIKUNI
DPR8EA-9/NGK
0.8–0.9 mm (0.031–0.035 in)
Wet, centrifugal automatic
10-3
YXR660FA