Engine Specifications - Yamaha YZ450FX 2021 Owner's Service Manual

EAM20128

ENGINE SPECIFICATIONS

Engine
Combustion cycle
Cooling system
Valve train
Displacement
Number of cylinders
Bore  stroke
Compression ratio
Starting system
Fuel
Recommended fuel
Fuel tank capacity
Fuel reserve amount
Engine oil
Recommended brand
SAE viscosity grades
Recommended engine oil grade
Lubrication system
Engine oil quantity
Oil change
With oil filter removal
Quantity (disassembled)
Oil filter
Oil filter type
Cooling system
Coolant quantity
Radiator (including all routes)
Radiator cap valve opening pressure
Spark plug(s)
Manufacturer/model
Spark plug gap
Cylinder head
Warpage limit
Camshaft
Camshaft cap inside diameter
Camshaft journal diameter
Camshaft-journal-to-camshaft-cap clearance
Camshaft lobe dimensions
Lobe height limit (Intake)
Lobe height limit (Exhaust)
Valve, valve seat, valve guide
Valve clearance (cold)
Intake
Exhaust
ENGINE SPECIFICATIONS
4-stroke
Liquid cooled
DOHC
450 cm³
Single cylinder
97.0  60.8 mm (3.82  2.39 in)
13.0 : 1
Electric starter
Premium unleaded gasoline (E10 acceptable)
8.2 L (2.2 US gal, 1.8 Imp.gal)
2.0 L (0.53 US gal, 0.44 Imp.gal)
YAMALUBE
10W-40, 10W-50, 15W-40, 20W-40 or 20W-50
API service SG type or higher, JASO standard
MA
Wet sump
0.63 L (0.67 US qt, 0.55 Imp.qt)
0.65 L (0.69 US qt, 0.57 Imp.qt)
0.90 L (0.95 US qt, 0.79 Imp.qt)
Cartridge
1.03 L (1.09 US qt, 0.91 Imp.qt)
107.9–137.3 kPa (1.08–1.37 kgf/cm², 15.6–19.9
psi)
NGK/LMAR8G
0.7–0.8 mm (0.028–0.031 in)
0.05 mm (0.0020 in)
22.000–22.021 mm (0.8661–0.8670 in)
21.959–21.972 mm (0.8645–0.8650 in)
0.028–0.062 mm (0.0011–0.0024 in)
38.030 mm (1.4972 in)
34.170 mm (1.3453 in)
0.10–0.17 mm (0.0039–0.0067 in)
0.15–0.22 mm (0.0059–0.0087 in)
2-2