Maintenance Specifications - Yamaha F20A Service Manual

SPEC

MAINTENANCE SPECIFICATIONS

ENGINE
Item
CYLINDER HEAD(S)
Warpage limit
CYLINDER(S)
Bore
Standard
Taper limit
Out-of-round limit
CAMSHAFT(S)
Intake (A)
Intake (B)
Exhaust (A)
Exhaust (B)
Camshaft journal diameter
Cylinder head journal diameter
Camshaft runout limit
Cylinder block inside diameter
ROCKER ARM SHAFT(S)
Outside diameter
ROCKER ARM(S)
Inside diameter
VALVES
Face angle
Valve clearance (cold)
Intake
Exhaust
Head diameter (A)
Intake
Exhaust
Face width (B)
Intake
Exhaust
Seat width (C)
MAINTENANCE SPECIFICATIONS
Worldwide
USA, CANADA
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
A
mm (in)
mm (in)
B
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
Degree
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
mm (in)
Unit
F20A
—
65.000 ~ 65.015 (2.5590 ~ 2.5596)
30.884 ~ 30.984 (1.2159 ~ 1.2198)
25.95 ~ 26.05 (1.022 ~ 1.025)
30.884 ~ 30.984 (1.2159 ~ 1.2198)
25.95 ~ 26.05 (1.022 ~ 1.025)
36.925 ~ 36.945 (1.4537 ~ 1.4545)
37.000 ~ 37.025 (1.4567 ~ 1.4577)
A: Blue 38.032 ~ 38.040 (1.4973 ~ 1.4976)
B: Black 38.024 ~ 38.032 (1.4970 ~ 1.4973)
C: Brown 38.016 ~ 38.024 (1.4967 ~ 1.4973)
15.971 ~ 15.991 (0.6288 ~ 0.6296)
16.000 ~ 16.018 (0.6299 ~ 0.6306)
0.2 ± 0.05 (0.008 ± 0.002)
0.3 ± 0.05 (0.012 ± 0.002)
31.9 ~ 32.1 (1.255 ~ 1.263)
25.9 ~ 26.1 (1.020 ~ 1.027)
2-3
Model
0.1 (0.004)
0.08 (0.003)
0.08 (0.003)
0.1 (0.0039)
180, 90, 60
2.3 ~ 2.7 (0.091 ~ 0.106)
2.5 ~ 2.9 (0.098 ~ 0.114)
0.9 ~ 1.1 (0.035 ~ 0.043)
E
F25A
F25X