Service Manual

5-4 ENGINE TOP END
Specifications
Item Service Limit
Cylinder Head:
Cylinder Compression (MIN) 440 kPa (64 psi) @ Engine Oil Temperature 50 ∼
60°C (122 ∼ 144°F), Cranking Speed 450 rpm/5
Seconds
Cylinder Head Warp 0.05 mm (0.002 in.)
Valves:
Valve Head Thickness:
Inlet, Exhaust 0.3 mm (0.012 in.)
Valve Stem Runout:
Inlet, Exhaust
TIR 0.05 mm (0.002 in.)
Valve Stem Diameter:
Inlet 5.95 mm (0.234 in.)
Exhaust 5.93 mm (0.233 in.)
Valve Guide Inside Diameter:
Inlet, Exhaust 6.08 mm (0.239 in.)
Valve Spring Free Length:
Inlet, Exhaust 31.0 mm (1.22 in.)
Rocker Arm Push Rod Runout:
Inlet, Exhaust TIR 0.5 mm (0.02 in.)
Rocker Shaft Outside Diameter:
Inlet, Exhaust 10.91 mm (0.430 in.)
Rocker Arm Inside Diameter:
Inlet, Exhaust 11.13 mm (0.438 in.)
Cylinder, Piston:
Piston Diameter 77.79 mm (3.063 in.)
Piston Ring/Groove Clearance:
Top
0.19 mm (0.0075 in.)
Second 0.20 mm (0.0079 in.)
Piston Ring Thickness:
Top
1.1 mm (0.043 in.)
Second 1.1 mm (0.043 in.)
Piston Ring End Gap:
Top 0.6 mm (0.024 in.)
Second 0.9 mm (0.035 in.)
Oil 1.1 mm (0.043 in.)
Piston Pin Outside Diameter 16.96 mm (0.668 in.)
Piston Pin Hole Inside Diameter 17.08 mm (0.672 in.)
Connecting Rod Small End Inside Diameter 17.06 mm (0.672 in.)
Cylinder Inside Diameter:
Standard Cylinder 78.08 mm (3.074 in.)
0.50 mm Oversize Cylinder 78.58 mm (3.094 in.)
Cylinder Inside D
iameter Out Round
0.05 mm (0.002 in.
)