Yamaha YZF-R25 Service Manual page 36

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Thermostat
Valve opening temperature
Valve full open temperature
Valve lift (full open)
Radiator core
Width
Height
Depth
Water pump
Water pump type
Reduction ratio
Spark plug(s)
Manufacturer/model
Spark plug gap
Cylinder head
Combustion chamber volume
Warpage limit
Camshaft
Drive system
Camshaft cap inside diameter
Camshaft journal diameter
Camshaft-journal-to-camshaft-cap clearance
Camshaft lobe dimensions
Lobe height (Intake)
Limit
Base circle diameter (Intake)
Limit
Lobe height (Exhaust)
Limit
Base circle diameter (Exhaust)
Limit
Camshaft runout limit
Timing chain
Tensioning system
Valve, valve seat, valve guide
Valve clearance (cold)
Intake
Exhaust
Valve dimensions
Valve head diameter (intake)
Valve head diameter (exhaust)
Valve seat contact width (intake)
Valve seat contact width (exhaust)
Valve stem diameter (intake)
Limit
Valve stem diameter (exhaust)
Limit
Valve guide inside diameter (intake)
ENGINE SPECIFICATIONS
80.5–83.5 °C (176.90–182.30 °F)
95.0 °C (203.00 °F)
3.0 mm (0.12 in)
145.8 mm (5.74 in)
270.0 mm (10.63 in)
24.0 mm (0.94 in)
Single suction centrifugal pump
41/23 (1.783)
NGK/CR9E
0.7–0.8 mm (0.028–0.031 in)
9.00–9.80 cm³ (0.55–0.60 cu.in)
0.05 mm (0.0020 in)
Chain drive (right)
22.500–22.521 mm (0.8858–0.8867 in)
22.459–22.472 mm (0.8842–0.8847 in)
0.028–0.062 mm (0.0011–0.0024 in)
32.050–32.150 mm (1.2618–1.2657 in)
31.950 mm (1.2579 in)
24.972–25.072 mm (0.9831–0.9871 in)
24.872 mm (0.9792 in)
31.650–31.750 mm (1.2461–1.2500 in)
31.550 mm (1.2421 in)
25.082–25.182 mm (0.9875–0.9914 in)
24.982 mm (0.9835 in)
0.030 mm (0.0012 in)
Automatic
0.11–0.18 mm (0.0043–0.0071 in)
0.21–0.30 mm (0.0083–0.0118 in)
22.90–23.10 mm (0.9016–0.9094 in)
19.40–19.60 mm (0.7638–0.7717 in)
0.90–1.20 mm (0.0354–0.0472 in)
0.90–1.20 mm (0.0354–0.0472 in)
4.475–4.490 mm (0.1762–0.1768 in)
4.445 mm (0.1750 in)
4.460–4.475 mm (0.1756–0.1762 in)
4.430 mm (0.1744 in)
4.500–4.512 mm (0.1772–0.1776 in)
2-3

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