13-8 AY50K4/WK4 (’04-MODEL)
AY50W
CYLINDER + PISTON + PISTON RING
Unit: mm
CONROD + CRANKSHAFT Unit: mm
OIL PUMP
CLUTCH
Unit: mm
ITEM STANDARD LIMIT
Piston to cylinder clearance 0.035 – 0.045 0.120
Cylinder bore 41.010 – 41.025
Measure at 20 mm from the top surface.
41.105
Piston diam. 40.970 – 40.985
Measure at 23 mm from the skirt end.
40.890
Cylinder distortion — 0.05
Cylinder head distortion — 0.05
Piston ring free end gap
1st &
2nd
T Approx. 4.5 3.6
N Approx. 3.0 2.4
Piston ring end gap 1st &
2nd
T&
N
0.08 – 0.18 0.80
Piston ring to groove clearance 1st & 2nd 0.01 – 0.05 —
Piston pin bore 12.002 – 12.010 12.030
Piston pin O.D. 11.996 – 12.000 11.980
ITEM STANDARD LIMIT
Conrod small end I.D. 16.003 – 16.011 16.040
Conrod deflection — 3.0
Crank web to web width 38.0 ± 0.05 —
Crankshaft runout — 0.05
ITEM SPECIFICATION
Oil pump reduction ratio 30.000 (30/1)
Oil pump discharge rate 0.8 – 1.0 ml
for 5 minutes at 3 000 r/min
ITEM STANDARD LIMIT
Clutch wheel I.D. 110.00 – 110.15 110.50
Clutch shoe thickness 3.0 2.0
Clutch engagement 4 000 ± 200 r/min —
Clutch lock-up 5 600 ± 300 r/min —
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