Yamaha 2002 YFA1 - Maintenance Specifications; Engine Maintenance Data

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SPEC
MAINTENANCE SPECIFICATIONS
MAINTENANCE SPECIFICATIONS
ENGINE
Model YFA1 (P) 2002
Cylinder:
Bore size 48.99 ~ 49.03 mm (1.9287 ~ 1.9303 in)
<Wear limit> <49.15 mm (1.935 in)>
Measuring point “
*
” 45 mm (1.77 in)
Camshaft:
Drive method Chain drive (left)
Cam dimensions
Intake “A” 26.169 ~ 26.269 mm (1.0303 ~ 1.0342 in)
“B” 21.061 ~ 21.161 mm (0.8292 ~ 0.8331 in)
“C” 5.159 ~ 5.279 mm (0.2031 ~ 0.2078 in)
Exhaust “A” 26.169 ~ 26.269 mm (1.0303 ~ 1.0342 in)
“B” 21.061 ~ 21.161 mm (0.8292 ~ 0.8331 in)
“C” 5.159 ~ 5.279 mm (0.2031 ~ 0.2078 in)
Camshaft runout limit 0.03 mm (0.0012 in)
Rocker arm/rocker arm shaft:
Inside diameter (rocker arm) 10.000 ~ 10.015 mm (0.3937 ~ 0.3943 in)
Outside diameter (shaft) 9.981 ~ 9.991 mm (0.3930 ~ 0.3933 in)
Arm-to-shaft clearance 0.009 ~ 0.034 mm (0.0004 ~ 0.0013 in)
Valve, valve seat, valve guide:
Valve clearance (cold)
Intake 0.08 ~ 0.12 mm (0.0031 ~ 0.0047 in)
Exhaust 0.10 ~ 0.14 mm (0.0039 ~ 0.0055 in)
Valve dimensions
“A” head diameter
Intake 25.9 ~ 26.1 mm (1.02 ~ 1.03 in)
Exhaust 21.9 ~ 22.1 mm (0.86 ~ 0.87 in)
“B” face width
Intake 1.4 ~ 3.0 mm (0.06 ~ 0.12 in)
Exhaust 1.7 ~ 2.8 mm (0.07 ~ 0.11 in)
“C” seat width
Intake 0.9 ~ 1.1 mm (0.035 ~ 0.043 in)
Exhaust 0.9 ~ 1.1 mm (0.035 ~ 0.043 in)
“D” margin thickness
Intake 0.4 ~ 0.8 mm (0.016 ~ 0.031 in)
Exhaust 0.8 ~ 1.2 mm (0.031 ~ 0.047 in)
Outside diameter (valve stem)
Intake 4.975 ~ 4.990 mm (0.196 in)
Exhaust 4.960 ~ 4.975 mm (0.195 ~ 0.196 in)
C
A
B
A
B
C
D