Yamaha YFZ50 2019 Owner's Manual page 118

Engine oil:
Recommended brand:
SAE viscosity grades:
5W-30, 10W-30, 10W-40, 15W-40, 20W-40, 20W-50
Recommended engine oil grade:
API service SG type or higher, JASO standard MA
0 10 30
SAE 5W-30
SAE 10W-30
–20 –10 0
10
Quantity:
Oil change:
0.80 L (0.85 US qt, 0.70 Imp.qt)
Transmission oil:
Type:
SAE 80W-90
Quantity:
0.35 L (0.37 US qt, 0.31 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:
Wet element
Air filter oil grade:
Foam air-filter oil
Fuel:
Recommended fuel:
Regular unleaded gasoline only
Minimum research octane:
91
Fuel tank capacity:
130 ˚F 5.6 L (1.5 US gal, 1.2 Imp.gal)
Fuel reserve amount:
0.7 L (0.18 US gal, 0.15 Imp.gal)
Carburetor:
Type × quantity:
VM12 × 1
Spark plug (s):
Manufacturer/model:
NGK/CR6HSA
Spark plug gap:
0.6–0.7 mm (0.024–0.028 in)
Drivetrain:
50 ˚C
Primary reduction ratio:
1.000
Secondary reduction ratio:
2.923 (38/13)
Final drive:
Chain
Clutch type:
Dry, centrifugal, shoe
10-2