ENGINE TOP END
3-5-6
Item Standard Service Limit
Cylinder Head:
Cylinder compression(usable range)
Electric starter
Cylinder head warp
Cylinder Head Height
Valve Seat Contacting Width - Exhaust
Valve Seat Contacting Width - Intake
Valve Seat Angles
450 ~700 kPa (4.7 ~ 7.2 kgf/cm²,65 ~
102 psi) @ 300 r/min (rpm)
– – –
120.5 ± 0.03 mm (4.7441" ± 0.0012")
1.5 ~ 1.6 mm (0.0591" ~ 0.0630")
1.0 ~ 1.1 mm (0.0394" ~ 0.0433")
30.0° ± 1.5° / 45.0° ± 0.5° / 60.0° ± 1.5°
– – –
0.05 mm (0.002 in.)
– – –
1.9 mm (0.0748")
1.4 mm (0.0551")
– – –
Valve Guide Inner Diameter
5.500 ~ 5.512 mm (0.2165" ~ 0.2170") – – –
Valve Spring:
Valve Spring Free Length 42.5 mm (1.6732" ) 41.4 mm (1.6299" )
Valve:
Valve clearance (Cold):
Exhaust
Intake
Valve head thickness:
Exhaust
Intake
Valve stem bend
Valve stem diameter:
Exhaust
Intake
Valve Stem Oil Clearance:
Exhaust
Intake
Valve Stem Overall Length:
Exhaust
Intake
Valve/valve guide clearance
(wobble method):
Exhaust
Intake
0.20 ~ 0.30 mm (0.0079" ~ 0.0117")
0.10 ~ 0.20 mm (0.0039" ~ 0.0079")
0.9 mm (0.0354")
0.7 mm (0.0276")
– – –
5.455 ~ 5.470 mm (0.2147" ~ 0.2153")
5.475 ~ 5.490 mm (0.2155" ~ 0.2161")
0.030 ~ 0.060 mm (0.0011" ~ 0.0023")
0.010 ~ 0.040 mm (0.0003" ~ 0.0015")
96.10 mm (3.7835")
95.50 mm (3.7598")
0.09 ~ 0.17 mm (0.0035" ~ 0.0067")
0.03 ~ 0.11 mm (0.0012" ~ 0.0043")
– – –
– – –
0.5 mm (0.020")
0.3 mm (0.012")
TIR 0.05 mm (0.020")
0.34 mm (0.0133")
0.25 mm (0.0110")
Piston:
Piston O.D. :
Ⅰ
Ⅱ
Piston Pin Bore I.D.
98.931 ~ 98.941 mm (3.8949" ~ 3.8953")
98.939 ~ 98.949 mm (3.8952" ~ 3.8956")
22.004 ~ 22.010 mm (0.8663" ~ 0.8665")
98.81 mm (3.8902")
98.82 mm (3.8906")
22.05(0.7087")
Technical Parameter
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