Yamaha WaveRunner VXR VX1800A, Service Manual

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Power unit technical data
2-4
Power unit technical data
Power unit
Compression pressure
Minimum 780 kPa (7.8 kgf/cm², 113.1 psi)
Oil cooler
Water passage holding pressure 200 kPa (2.0 kgf/cm², 29.0 psi)
Thermostat
Valve opening temperature 58 °C (136 °F)
Fully open temperature 70 °C (158 °F)
Fully open stroke 4.3 mm (0.17 in)
Cylinder head ASSY
Cylinder head
Warpage limit 0.100 mm (0.0039 in)
Camshaft cap inside diameter 25.000–25.021 mm (0.9843–0.9851 in)
Camshaft
Cam lobe height-intake 41.330–41.430 mm (1.6272–1.6311 in)
Limit 41.230 mm (1.6232 in)
Cam lobe height-exhaust 41.220–41.320 mm (1.6228–1.6268 in)
Limit 41.120 mm (1.6189 in)
Runout 0.015 mm (0.0006 in)
Limit 0.05 mm (0.0020 in)
Journal diameter 24.960–24.980 mm (0.9827–0.9835 in)
Journal oil clearance 0.020–0.061 mm (0.0008–0.0024 in)
Limit 0.08 mm (0.0032 in)
Valve clearance
Valve clearance-intake (cold) 0.14–0.23 mm (0.0055–0.0091 in)
Valve clearance-exhaust (cold) 0.28–0.37 mm (0.0110–0.0146 in)
Valve
Head diameter-intake 33.900–34.100 mm (1.3346–1.3425 in)
Head diameter-exhaust 28.900–29.100 mm (1.1378–1.1457 in)
Face width-intake 2.260–2.830 mm (0.0890–0.1114 in)
Face width-exhaust 2.260–2.830 mm (0.0890–0.1114 in)
Seat contact width-intake 1.400–1.600 mm (0.0551–0.0630 in)
Limit 2.100 mm (0.0827 in)
Seat contact width-exhaust 1.500–1.700 mm (0.0591–0.0669 in)
Limit 2.200 mm (0.0866 in)
Margin thickness-intake 0.800–1.200 mm (0.0315–0.0472 in)
Margin thickness-exhaust 0.800–1.200 mm (0.0315–0.0472 in)
Valve stem
Diameter-intake 5.477–5.492 mm (0.2156–0.2162 in)
Limit 5.447 mm (0.2144 in)
Diameter-exhaust 5.464–5.479 mm (0.2151–0.2157 in)
Limit 5.434 mm (0.2139 in)
Runout limit 0.010 mm (0.0004 in)