YAMAHA YZ450F 2012 Owner's Guide

2-1
GENERAL SPECIFICATIONS
SPECIFICATIONS
GENERAL SPECIFICATIONS
Model name: YZ450FB (USA, CDN, AUS, NZ)
YZ450F (EUROPE, ZA)
Model code number: 33D9 (USA,CDN)
33DA (EUROPE)
33DC (AUS, NZ, ZA)
Dimensions: USA, CDN EUROPE AUS, NZ, ZA
Overall length 2,195 mm (86.42
in)2,191 mm (86.26
in)2,196 mm (86.46
in)
Overall width 825 mm (32.48 in)←←
Overall height 1,312 mm (51.65
in)1,311 mm (51.61
in)1,312 mm (51.65
in)
Seat height 999 mm (39.33 in)←998 mm (39.29 in)
Wheelbase 1,492 mm (58.74
in)1,487 mm (58.54
in)←
Minimum ground clearance 384 mm (15.12 in) 383 mm (15.08 in)←
Weight:
Curb weight 111 kg (245 lb)
Engine:
Engine type Liquid cooled 4-stroke, DOHC
Cylinder arrangement Single cylinder
Displacement 449.7 cm
3 (15.8 Imp oz, 15.2 US oz)
Bore × stroke 97.0 × 60.8 mm (3.82 × 2.39 in)
Compression ratio 12.5 : 1
Starting system Kickstarter
Lubrication system: Dry sump
Oil type or grade:
Engine oil
Recommended brand: YAMALUBE
SAE10W-30, SAE10W-40, SAE10W-50,
SAE15W-40, SAE20W-40 or SAE20W-50
API service SG type or higher,
JASO standard MA
Oil capacity:
Engine oil
Periodic oil change 0.95 L (0.84 Imp qt, 1.00 US qt)
With oil filter replacement 1.0 L (0.88 Imp qt, 1.06 US qt)
Total amount 1.2 L (1.06 Imp qt, 1.27 US qt)
Coolant capacity (including all routes): 1.13 L (0.99 Imp qt, 1.19 US qt)
Air filter: Wet type element
2

2-2
GENERAL SPECIFICATIONS
Fuel:Type Premium unleaded gasoline only
Tank capacity 6.2 L (1.40 Imp gal, 1.64 US gal)
Throttle body: Type 30RA
Manufacturer KEIHIN
Spark plug: Type/manufacturer CR8E/NGK (resistance type)
Gap 0.7–0.8 mm (0.028–0.031 in)
Clutch type: Wet, multiple-disc
Transmission: Primary reduction system Gear
Primary reduction ratio 2.652 (61/23)
Final drive Chain
Secondary reduction ratio 3.6 92 (48/13) (For USA, CDN)
3.769 (49/13) (For EUROPE, AUS, NZ, ZA)
Transmission type Constant mesh, 5-speed
Operation Left foot operation
Gear ratio: 1st 1.929 (27/14)
2nd 1.533 (23/15)
3rd 1.278 (23/18)
4th 1.091 (24/22)
5th 0.952 (20/21)
Chassis: USA, CDN EUROPE AUS, NZ, ZA
Frame type Semi double cra-
dle ←←
Caster angle 26.95°26.80°27.00°
Trail 119 mm (4.69 in) 117 mm (4.61 in) 120 mm (4.72 in)
Tire: Type With tube
Size (front) 80/100-21 51M
Size (rear) 120/80-19 63M (For USA, CDN, AUS, NZ, ZA)
110/90-19 62M (For EUROPE)
Tire pressure (front and rear) 100 kPa (1.0 kgf/cm
2, 15 psi)
Brake: Front brake type Single disc brake
Operation Right hand operation
Rear brake type Single disc brake
Operation Right foot operation
Suspension:
Front suspension Telescopic fork
Rear suspension Swingarm (link type monocross suspension)
Shock absorber:
Front shock absorber Coil spring/oil damper
Rear shock absorber Coil spring/gas, oil damper

2-3
MAINTENANCE SPECIFICATIONS
MAINTENANCE SPECIFICATIONS
ENGINEWheel travel:
Front wheel travel 310 mm (12.2 in)
Rear wheel travel 315 mm (12.4 in) (For USA, CDN)
312 mm (12.3 in) (For EUROPE, AUS, NZ, ZA)
Electrical:
Ignition system TCI
Item Standard Limit
Cylinder head:
Warp limit ---- 0.05 mm (0.002
in)
Cylinder:
Bore size 97.00–97.01 mm (3.8189–3.8193 in) ----
Out of round limit ---- 0.05 mm (0.002
in)
Camshaft:
Drive method Chain drive (Left) ----
Camshaft cap inside diameter 22.000–22.021 mm (0.8661–0.8670 in) ----
Camshaft outside diameter 21.959–21.972 mm (0.8645–0.8650 in) ----
Shaft-to-cap clearance 0.028–0.062 mm (0.0011–0.0024 in) 0.08 mm (0.003
in)
Cam dimensions
Intake "A" 37.750–37.850 mm (1.4862–1.4902 in) 37.650 mm
(1.4823 in)
Intake "B" 28.129–28.229 mm (1.1074–1.1114 in) 28.029 mm
(1.1035 in)
Exhaust "A" 33.540–33.640 mm (1.3205–1.3244 in) 33.440 mm
(1.3165 in)
Exhaust "B" 24.769–24.869 mm (0.9752–0.9791 in) 24.669 mm
(0.9712 in)
Camshaft runout limit ---- 0.03 mm
(0.0012 in)

2-4
MAINTENANCE SPECIFICATIONS
Timing chain:
Timing chain type/No. of links 98XRH2010-122M/122 ----
Timing chain adjustment method Automatic ----
Valve, valve seat, valve guide:
Valve clearance (cold)
IN 0.10–0.15 mm (0.0039–0.0059 in) ----
EX 0.20–0.25 mm (0.0079–0.0098 in) ----
Valve dimensions:
"A" head diameter (IN) 35.9–36.1 mm (1.4134–1.4213 in) ----
"A" head diameter (EX) 29.9–30.1 mm (1.1772–1.1850 in) ----
"B" face width (IN) 2.26 mm (0.089 in) ----
"B" face width (EX) 2.26 mm (0.089 in) ----
"C" seat width (IN) 0.9–1.1 mm (0.0354–0.0433 in) 1.6 mm (0.0630
in)
"C" seat width (EX) 0.9–1.1 mm (0.0354–0.0433 in) 1.6 mm (0.0630
in)
"D" margin thickness (IN) 1.3 mm (0.0512 in) ----
"D" margin thickness (EX) 1.0 mm (0.0394 in) ----
Stem outside diameter (IN) 5.475–5.490 mm (0.2156–0.2161 in) 5.445 mm
(0.2144 in)
Stem outside diameter (EX) 5.465–5.480 mm (0.2152–0.2157 in) 5.435 mm
(0.2140 in)
Guide inside diameter (IN) 5.500–5.512 mm (0.2165–0.2170 in) 5.550 mm
(0.2185 in)
Guide inside diameter (EX) 5.500–5.512 mm (0.2165–0.2170 in) 5.550 mm
(0.2185 in) Item Standard Limit

2-5
MAINTENANCE SPECIFICATIONS
Stem-to-guide clearance (IN) 0.010–0.037 mm (0.0004–0.0015 in) 0.08 mm (0.003
in)
Stem-to-guide clearance (EX) 0.020–0.047 mm (0.0008–0.0019 in) 0.10 mm (0.004
in)
Stem runout limit ---- 0.01 mm
(0.0004 in)
Valve seat width (IN) 0.9–1.1 mm (0.0354–0.0433 in) 1.6 mm (0.0630
in)
Valve seat width (EX) 0.9–1.1 mm (0.0354–0.0433 in) 1.6 mm (0.0630
in)
Valve spring:
Free length (IN) 40.76 mm (1.60 in) 39.76 mm (1.57
in)
Free length (EX) 37.01mm (1.46 in) 36.01 mm (1.42
in)
Set length (valve closed) (IN) 34.78 mm (1.37 in) ----
Set length (valve closed) (EX) 30.83 mm (1.21 in) ----
Compressed force (installed) (IN) 178–204 N at 34.78 mm (18.2–20.8 kg at
34.78 mm, 40.01–45.86 lb at 1.37 in)----
Compressed force (installed) (EX) 124–142 N at 30.83 mm (12.6–14.5 kg at
30.83 mm, 27.88–31.92 lb at 1.21 in)----
Tilt limit* (IN) ---- 2.5°/1.8 mm
(2.5°/0.071 in)
Tilt limit* (EX) ---- 2.5°/1.6 mm
(2.5°/0.063 in)
Direction of winding (top view) (IN) Clockwise ----
Direction of winding (top view) (EX) Clockwise ----Item Standard Limit

2-6
MAINTENANCE SPECIFICATIONS
Piston:
Piston to cylinder clearance 0.020–0.045 mm (0.0008–0.0018 in) 0.1 mm (0.004
in)
Piston size "D" 96.965–96.980 mm (3.8175–3.8181 in) ----
Measuring point "H" 9.0 mm (0.354 in) ----
Piston off-set Zero mm (Zero in) ----
Piston pin bore inside diameter 18.004–18.015 mm (0.7088–0.7093 in) 18.045 mm
(0.7104 in)
Piston pin outside diameter 17.991–18.000 mm (0.7083–0.7087 in) 17.971 mm
(0.7075 in)
Piston rings:
Top ring:
Type Barrel ----
Dimensions (B × T) 1.00 × 3.30 mm (0.04 × 0.13 in) ----
End gap (installed) 0.20–0.30 mm (0.008–0.012 in) 0.55 mm (0.022
in)
Side clearance (installed) 0.015–0.065 mm (0.0006–0.0026 in) 0.120 mm
(0.0047 in)
2nd ring:
Type Taper ----
Dimensions (B × T) 1.00 × 3.10 mm (0.04 × 0.12 in) ----
End gap (installed) 0.35–0.50 mm (0.014–0.020 in) 0.85 mm (0.033
in)
Side clearance 0.020–0.060 mm (0.0008–0.0024 in) 0.120 mm
(0.0047 in)
Oil ring:
Dimensions (B × T) 1.5 × 2.55 mm (0.06 × 0.10 in) ----
End gap (installed) 0.20–0.50 mm (0.008–0.020 in) ----Item Standard Limit

2-7
MAINTENANCE SPECIFICATIONS
Crankshaft:
Crank width "A" 61.95–62.00 mm (2.439–2.441 in) ----
Runout limit "C" 0.03 mm (0.0012 in) 0.05 mm (0.002
in)
Big end side clearance "D" 0.15–0.45 mm (0.0059–0.0177 in) 0.50 mm (0.02
in)
Small end free play "F" 0.4–1.0 mm (0.02–0.04 in) 2.0 mm (0.08
in)
Balancer:
Balancer drive method Gear ----
Air filter oil grade: Foam-air-filter oil or equivalent oil ----
Clutch:
Friction plate thickness 2.92–3.08 mm (0.115–0.121 in) 2.8 mm (0.110
in)
Quantity 8 ----
Clutch plate thickness 1.5–1.7 mm (0.059–0.067 in) ----
Quantity 7 ----
Warp limit ---- 0.1 mm (0.004
in)
Clutch spring free length 50.0 mm (1.97 in) 49.0 mm (1.93
in)
Quantity 6 ----
Clutch housing thrust clearance 0.10–0.35 mm (0.0039–0.0138 in) ----
Clutch housing radial clearance 0.010–0.044 mm (0.0004–0.0017 in) ----
Clutch release method Inner push, cam push ----
Shifter:
Shifter type Cam drum and guide bar ----
Guide bar bending limit ---- 0.05 mm (0.002
in)
Kickstarter:
Type Kick and ratchet type ----
Fuel pump:
Fuel pressure 324 kPa (3.24 kg/cm
2, 46.1 psi) ----
Fuel injector:----
Model/manufacturer 1010/DENSO ----
Throttle body:----
I. D. mark 33D1 00 ----
Manufacturer KEIHIN ----Item Standard Limit

2-8
MAINTENANCE SPECIFICATIONS
Throttle position sensor:----
Throttle position sensor maximum resistance 5 kΩ----
Throttle position sensor variable resistance 0–2 kΩ (full closed) ----
Throttle position sensor input voltage 4–6 V ----
Fuel injection sensor:----
Crankshaft position sensor resistance 248–372 Ω----
Intake air pressure sensor output voltage 3.57–3.71 V at 101.3kPa (1.013 kg/cm
2,
14.41 psi)----
Atmospheric pressure sensor output voltage 3.57–3.71 V at 101.3kPa (1.013 kg/cm
2,
14.41 psi)----
Intake air temperature sensor 5.4–6.6 kΩat 0 °C (32 °F)
290–390 Ωat 80 °C (176 °F)----
Idling condition:----
Engine idle speed 1,900–2,100 r/min ----
Oil temperature 55–65 °C (131–149 °F) ----
Lubrication system:
Oil filter type Paper type ----
Oil pump type Trochoid type ----
Tip clearance 0.12 mm or less (0.0047 in or less) 0.20 mm (0.008
in)
Side clearance 0.09–0.17 mm (0.0035–0.0067 in) 0.24 mm (0.009
in)
Housing and rotor clearance 0.03–0.10 mm (0.0012–0.0039 in) 0.17 mm (0.007
in)
Bypass valve setting pressure 40–80 kPa (0.4–0.8 kg/cm
2, 5.69–11.38
psi)----
Cooling:
Radiator core size
Width 121.4 mm (4.78 in) ----
Height 235 mm (9.25 in) ----
Thickness 28 mm (1.10 in) ----
Radiator cap opening pressure 108–137 kPa (1.08–1.37 kg/cm
2,
15.4–19.5 psi)----
Radiator capacity (total) 0.62 L (0.55 Imp qt, 0.66 US qt) ----
Water pump
Type Single-suction centrifugal pump ----Item Standard Limit

2-9
MAINTENANCE SPECIFICATIONS
CHASSIS
Item Standard Limit
Steering system:
Steering bearing typeTaper roller bearing ----
Front suspension: USA, CDN EUROPE, AUS, NZ, ZA
Front fork travel 310 mm (12.2 in)←----
Fork spring free length 470 mm (18.5 in)←465 mm (18.3
in)
Spring rate, STD K = 4.6 N/mm (0.469 kg/
mm, 26.3 lb/in)←----
Optional spring Yes←----
Oil capacity 551 cm
3 (19.4 lmp oz,
18.63 US oz)←----
Oil grade Suspension oil "S1"←----
Inner tube outer diameter 48 mm (1.89 in)←----
Front fork top end Zero mm (Zero in)←----
Rear suspension: USA, CDN EUROPE, AUS, NZ, ZA
Shock absorber travel 132.0 mm (5.20 in)←----
Spring free length 260 mm (10.24 in)←254.8 mm
(10.03 in)
Fitting length 250 mm (9.84 in) 246 mm (9.69 in) ----
Preload length
1.5–18 mm (0.06–0.71
in)←
Spring rate, STD K = 56.0 N/mm (5.7 kg/
mm, 319.2 lb/in)K = 54.0 N/mm (5.5 kg/
mm, 308.0 lb/in)----
Optional spring Yes←----
Enclosed gas pressure 1,000 kPa (10 kg/cm
2,
142 psi)←----
Swingarm:
Swingarm free play limit
End ---- 1.0 mm (0.04
in)
Wheel:
Front wheel type Spoke wheel ----
Rear wheel typeSpoke wheel ----
Front rim size/material 21 × 1.60/Aluminum ----
Rear rim size/material 19 × 2.15/Aluminum ----
Rim runout limit:
Radial ---- 2.0 mm (0.08
in)
Lateral ---- 2.0 mm (0.08
in)
Drive chain:
Type/manufacturer DID520DMA2 SDH/DAIDO ----
Number of links 113 links + joint ----
Chain slack 50–60 mm (2.0–2.4 in) ----
Chain length (15 links) ---- 242.9 mm
(9.563 in)

2-10
MAINTENANCE SPECIFICATIONS
ELECTRICALFront disc brake:
Disc outside dia.×Thickness 250 × 3.0 mm (9.84 × 0.12 in) 250 × 2.5 mm
(9.84 × 0.10 in)
Pad thickness 4.4 mm (0.17 in) 1.0 mm (0.04
in)
Master cylinder inside dia. 9.52 mm (0.375 in) ----
Caliper cylinder inside dia. 22.65 mm (0.892 in) × 2 ----
Brake fluid type DOT #4 ----
Rear disc brake:
Disc outside dia.×Thickness 245 × 4.0 mm (9.65 × 0.16 in) 245 × 3.5 mm
(9.65 × 0.14 in)
Deflection limit ---- 0.15 mm
(0.006 in)
Pad thickness 6.4 mm (0.25 in) 1.0 mm (0.04
in)
Master cylinder inside dia. 11.0 mm (0.433 in) ----
Caliper cylinder inside dia. 25.4 mm (1.000 in) × 1 ----
Brake fluid type DOT #4 ----
Brake lever and brake pedal:
Brake lever position 95 mm (3.74 in) ----
Brake pedal height (vertical height above footrest
top)Zero mm (Zero in) ----
Clutch lever free play (lever end) 7–12 mm (0.28–0.47 in) ----
Throttle grip free play3–5 mm (0.12–0.20 in) ---- Item Standard Limit
Item Standard Limit
Ignition system:
Advancer type Electrical ----
AC magneto:
Magneto-model (stator)/manufacturer 33D00/YAMAHA ----
Stator coil resistance (color) 0.60–0.90 Ωat 20 °C (68 °F)
(White–White)----
Crankshaft position sensor resistance (color) 248–372 Ωat 20 °C (68 °F) (Gray–Black) ----
ECU-model/manufacturer 33D7 (USA, CDN) ----
33D4 (EUROPE) ----
33D6 (AUS, NZ, ZA) ----
Ignition coil:
Model/manufacturer F6T541/MITSUBISHI ----
Minimum spark gap 6 mm (0.24 in) ----
Primary coil resistance 3.57–4.83 Ωat 20 °C (68 °F) ----
Secondary coil resistance 10.71–14.49 kΩat 20 °C (68 °F) ----
Coolant temperature sensor:
Coolant temperature sensor resistance 2.51–2.78 kΩat 20 °C (68 °F) ----
210–220 kΩat 100 °C (212 °F) ----