Yamaha YZ450FX 2023, Owner'S Manual

Page: 35 / 164

ENGINE SPECIFICATIONS
2-2
EAM20128
ENGINE SPECIFICATIONS
Engine
Combustion cycle 4-stroke
Cooling system Liquid cooled
Valve train DOHC
Displacement 450 cm³
Number of cylinders Single cylinder
Bore

stroke 97.0

60.8 mm (3.82

2.39 in)
Compression ratio 13.0 : 1
Starting system Electric starter
Fuel
Recommended fuel Unleaded gasoline (E10 acceptable)
Octane number (RON) 95
Fuel tank capacity 8.2 L (2.2 US gal, 1.8 Imp.gal)
Fuel reserve amount 2.0 L (0.53 US gal, 0.44 Imp.gal)
Engine oil
Recommended brand YAMALUBE
SAE viscosity grades 10W-40, 10W-50, 15W-40, 20W-40 or 20W-50
Recommended engine oil grade API service SG type or higher, JASO standard
MA
Lubrication system Wet sump
Engine oil quantity
Oil change 0.63 L (0.67 US qt, 0.55 Imp.qt)
With oil filter removal 0.65 L (0.69 US qt, 0.57 Imp.qt)
Quantity (disassembled) 0.90 L (0.95 US qt, 0.79 Imp.qt)
Cooling system
Coolant quantity
Radiator (including all routes) 1.03 L (1.09 US qt, 0.91 Imp.qt)
Spark plug(s)
Manufacturer/model NGK/LMAR8G
Spark plug gap 0.7–0.8 mm (0.028–0.031 in)
Valve
Valve clearance (cold)
Intake 0.10–0.17 mm (0.0039–0.0067 in)
Exhaust 0.15–0.22 mm (0.0059–0.0087 in)
Clutch
Clutch type Wet, multiple-disc
Clutch lever free play 7.0–12.0 mm (0.28–0.47 in)
Friction plate 1 thickness 2.92–3.08 mm (0.115–0.121 in)
Wear limit 2.82 mm (0.111 in)
Plate quantity 6 pcs
Friction plate 2 thickness 2.92–3.08 mm (0.115–0.121 in)
Wear limit 2.82 mm (0.111 in)
Plate quantity 2 pcs
Clutch plate thickness 1.50–1.70 mm (0.059–0.067 in)
Plate quantity 7 pcs
Warpage limit 0.10 mm (0.004 in)
Clutch spring free length 48.00 mm (1.89 in)
Clutch spring free length limit 45.60 mm (1.80 in)