Yamaha F4, Service Manual

Page: 42 / 307

2-3
E
SPEC
MAINTENANCE SPECIFICATIONS
MAINTENANCE SPECIFICATIONS
POWER UNIT
Item Unit
Model
F4A/F4
CYLINDER HEAD
Warpage limit mm (in) 0.1 (0.004)
CYLINDER
Bore mm (in) 59.00~59.02 (2.323~2.324)
Wear limit mm (in) 59.1 (2.33)
Taper limit mm (in) 0.08 (0.003)
Out of round limit mm (in) 0.05 (0.002)
CAMSHAFT
Intake (A) mm (in) 26.736~26.836 (1.0526~1.0565)
Exhaust (A) mm (in) 26.532~26.623 (1.0442~1.0481)
Intake (B) mm (in) 21.950~22.050 (0.8642~0.8681)
Exhaust (B) mm (in) 21.950~22.050 (0.8642~0.8681)
Camshaft diameter(journal) mm (in) 14.934~14.984 (0.5880~0.5899)
Camshaft round limit mm (in) 0.03 (0.001)
VALVE LIFTER
Outside diameter mm (in) 7.965~7.980 (0.3136~0.3142)
PUSH ROD
Runout limit mm (in) 0.5 (0.02)
VALVES
Valve clearance (cold)
Intake mm (in) 0.10 ± 0.02 (0.004 ± 0.0008)
Exhaust mm (in) 0.10 ± 0.02 (0.004 ± 0.0008)
Head diameter (A)
Intake mm (in) 23.9~24.1 (0.94~0.95)
Exhaust mm (in) 21.9~22.1 (0.86~0.87)
Face width (B)
Intake mm (in) 1.84~2.26 (0.072~0.089)
Exhaust mm (in) 1.84~2.26 (0.072~0.089)
Seat width (C)
Intake mm (in) 0.6~0.8 (0.02~0.03)
Exhaust mm (in) 0.6~0.8 (0.02~0.03)
Margin thickness (D)
Intake mm (in) 0.70 (0.028)
Exhaust mm (in) 1.00 (0.039)