Yamaha YFM40FBB Owner's Manual page 138

Engine oil quantity:
Without oil filter element replacement:
2.90 L (3.07 US qt, 2.55 Imp.qt)
With oil filter element replacement:
3.00 L (3.17 US qt, 2.64 Imp.qt)
Final gear oil:
Type:
Yamaha Friction Modified Shaft Drive Gear Oil (Part No.:
ACC-SHAFT-LU-00)
Quantity:
0.50 L (0.53 US qt, 0.44 Imp.qt)
Differential gear oil:
Type:
Yamaha Friction Modified Shaft Drive Gear Oil (Part No.:
ACC-SHAFT-LU-00) or SAE 80 API GL-4 Hypoid gear oil
Quantity:
0.23 L (0.24 US qt, 0.20 Imp.qt)
Air filter:
Air filter element:
Dry element
Fuel:
Recommended fuel:
Unleaded gasoline only
10
Fuel tank capacity:
15.0 L (3.96 US gal, 3.30 Imp.gal)
Fuel reserve amount:
4.0 L (1.06 US gal, 0.88 Imp.gal)
Carburetor:
Type × quantity:
BSR33 x 1
Spark plug (s):
Manufacturer/model:
NGK/DR8EA
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:
76/24 (3.167)
Secondary reduction system:
Shaft drive
Secondary reduction ratio:
28/24 × 24/18 × 33/09 (5.704)
Transmission type:
Constant mesh 5-speed.forward, 1-speed.reverse
Operation:
Left foot operation
Gear ratio:
1st:
40/12 (3.333)
2nd:
34/18 (1.889)
3rd:
30/22 (1.364)
4th:
25/26 (0.962)
5th:
19/27 (0.704)
10-2