Yamaha XP500, Technical Manual

Page: 38 / 45

XP500 TMax Technical Orientation Guide
37
Valve head diameter A exhaust 21.9~22.1mm
Valve face width B intake 1.14~1.98mm
Valve face width B exhaust 1.14~1.98mm
Valve seat width C intake 0.9~1.1mm
Valve seat width C exhaust 0.9~1.1mm
Valve margin thickness D intake 0.6~0.8mm
Valve margin thickness D exhaust 0.6~0.8mm
Valve stem diameter-intake 3.975~3.990mm
Valve stem diameter-exhaust 3.960~3.975mm
Valve guide inside diameter-intake 4.000~4.012mm
Valve guide inside diameter-exhaust 4.000~4.012mm
Valve stem to valve guideclearance-intake 0.010~0.037mm
Valve stem to valve guideclearance-exhaust 0.025~0.052mm
Valve stem runout 0.04mm
Valve seat width-intake 0.9~1.1mm
Valve seat width-exhaust 0.9~1.1mm
Valve seat material-intake PB6
Valve seat material-exhaust V557W
Valve spring:
Free length-intake 35.59mm
Free length-exhaust 35.59mm
Spring rate-intake (K1) 18.845N/mm(1.92kgf/mm)
Spring rate-intake (K2) 24.52N/mm(2.5kgf/mm)
Spring rate-exhaust (K1) 18.845N/mm(1.92kgf/mm)
Spring rate-exhaust (K2) 24.52N/mm(2.5kgf/mm)
Installed length-intake (valve closed) 30.39mm
Installed length-exhaust (valve closed) 30.39mm
Spring tilt-intake ((degree)) 2.5º/1.6mm
Spring tilt-exhaust ((degree)) 2.5º/1.8mm
Winding direction-intake(top view) Clockwise
Winding direction-exhaust(top view) Clockwise
Piston:
Piston part number (***-11631-**) 5GJ-11631-00
Piston-to-cylinder clearance 0.020~0.045mm
<Limit> 0.15mm
Diameter D 65.965~65.980mm
Height H 9mm
Offset 0.5mm
Offset direction Intake side
Piston pin bore inside diameter 16.002~16.013mm
Piston pin outside diameter 15.991~16.000mm
Piston ring:
Top ring:
Ring type Barrel
Dimensions (B x T) 0.80x2.45mm
End gap (installed) 0.15~0.25mm
Ring side clearance 0.030~0.065mm
GENERAL SPECIFICATIONS