Yamaha F6AMH, Service Manual

Page: 58 / 510

MAINTENANCE SPECIFICATIONS
Item Unit
Model
World wide F6AMH, F6BMH F8CMH, F8CW
USA, Canada F6MH F8MH
Face width “B” IN mm (in)
EX mm (in)
Seat width”C” IN mm (in) 0.6 - 0.8 (0.023 - 0.031)
EX mm (in) 0.6 - 0.8 (0.023 - 0.031)
Mergin thickness “D” IN mm (in) 0.7 (0.027)
EX mm (in) 1.0 (0.039)
Stem outside diameter IN mm (in) 5.475 - 5.490 (0.2156 - 0.2161)
EX mm (in) 5.460 - 5.475 (0.2150 - 0.2156)
Valve guide inside
diameter IN mm (in) 5.500 - 5.512 (0.2165 - 0.2170)
EX mm (in) 5.500 - 5.512 (0.2165 - 0.2170)
Stem-to-guide clearance IN mm (in) 0.010 - 0.037 (0.0004 - 0.0015)
EX mm (in) 0.025 - 0.052 (0.0010 - 0.0020)
Stem runout limit IN mm (in) 0.03 (0.0012)
EX mm (in) 0.03 (0.0012)
VALVE SPRING
Free length mm (in) 27.6 (1.09)
Free length
limit mm (in) 27.6 (1.09)
Tilt limit mm (in) 1.0 (0.04)
PISTON
Piston-to-cylinder clearance mm (in) 0.035-0.065 (0.0014-0.0026)
Piston
diameter (D) mm (in) 55.950-55.965 (2.2028-2.2033)
Measuring
point (H) mm (in) 15 (0.59)
Pin boss inside diameter mm (in) 14.004-14.015 (0.5513-0.5518)
Oversize piston diameter
1st mm (in) 56.200-56.215 (2.2126-2.2132)
2nd mm (in) 56.450-56.465 (2.2224-2.2230)
PISTON PIN
Outside
Diameter (D) mm (in) 13.996-14.000 (0.5510-0.5512)
PISTON RING
Top ring mm (in)
Dimension (B) mm (in) 1.2 (0.05)
Dimension (T) mm (in) 2.05 (0.08)
End gap (installed) mm (in) 0.15-0.30 (0.006-0.012)
Side clearance mm (in) 0.04-0.08 (0.0016-0.0031)
2-10
1.84 - 2.26 (0.072 - 0.089)
1.84 - 2.26 (0.072 - 0.089)