Service manual

2-4
E
SPEC
MAINTENANCE SPECIFICATIONS
Valve seat width C
Intake mm (in) 0.9–1.1 (0.0354–0.0433)
Exhaust mm (in) 0.9–1.1 (0.0354–0.0433)
Valve margin thickness D
Intake mm (in) 0.5–0.9 (0.0197–0.0354)
Exhaust mm (in) 0.5–0.9 (0.0197–0.0354)
Valve stem diameter
Intake mm (in) 3.975–3.990 (0.1565–0.1571)
Exhaust mm (in) 4.460–4.475 (0.1756–0.1762)
Valve guide inside diameter
Intake mm (in) 4.000–4.012 (0.1575–0.1580)
Exhaust mm (in) 4.500–4.512 (0.1772–0.1776)
Valve-stem-to-valve-guide
clearance
Intake mm (in) 0.010–0.037 (0.0004–0.0015)
Exhaust mm (in) 0.025–0.052 (0.0010–0.0020)
Valve stem runout mm (in) 0.01 (0.0004)
Valve spring
Free length
Intake mm (in) 38.90 (1.53)
Exhaust mm (in) 40.67 (1.60)
Installed length
Intake mm (in) 34.50 (1.36)
Exhaust mm (in) 35.00 (1.38)
Spring limit
Intake Degree/mm (in) 2.5/1.7 (0.067)
Exhaust Degree/mm (in) 2.5/1.8 (0.071)
Piston
Piston-to-cylinder clearance mm (in) 0.10–0.11 (0.0039–0.0043)
Piston diameter mm (in) 73.955–73.970 (2.9116–2.9121)
Measuring point H* mm (in) 5 (0.2)
Wear limit mm (in) 0.17 (0.0067)
Piston pin boss inside diameter mm (in) 17.002–17.013 (0.6693–0.6698)
Piston pins
Outside diameter mm (in) 16.991–17.000 (0.6689–0.6693)
Wear limit mm (in) 16.971 (0.6681)
Item Unit
Model
FX140