85
(15) Intake/exhaust valve
Mainly clean and check damage and wear at the valve stem and seat.
(a) Seat contact: See (1)-(d) above.
(b) Stem outside diameter: See (2) above.
(c) Valve head thickness
mm
Model Part Standard Limit
Intake 1.34 0.50
3/4IRH2N-8N
Exhaust 1.45 0.50
(d) Valve stem bend
mm
Limit 0.01
(e) Overall length
mm
Standard Limit
3IRH2N Intake/Exhaust ?
3/4IRH8N Intake/Exhaust
4IRI8N Intake/Exhaust 115 114.5
(16) Valve spring
Mainly inspect damage and corrosion.
mm
Free length standard Inclination limit
3IRH2N 44.4?
3/4IRH8N 42.0?
1.2
4IRI8N 47.5 1.2
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