Yamaha YFM660FS, Supplementary Service Manual

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SPEC
MAINTENANCE SPECIFICATIONS
Cam chain:
Cam chain type/No. of links 92RH2010J/126M ----
Cam chain adjustment method Automatic ----
Rocker arm/rocker arm shaft:
Bearing inside diameter 12.000 ~ 12.018 mm
(0.4724 ~ 0.4731 in) ----
Shaft outside diameter 11.976 ~ 11.991 mm
(0.4715 ~ 0.4721 in) ----
Arm-to-shaft clearance 0.009 ~ 0.042 mm
(0.0004 ~ 0.0017 in) ----
Valve, valve seat, valve guide:
Valve clearance (cold) IN 0.10 ~ 0.15 mm
(0.0039 ~ 0.0059 in) ----
EX 0.15 ~ 0.20 mm
(0.0059 ~ 0.0079 in) ----
Valve dimensions
“A” head diameter IN 29.9 ~ 30.1 mm
(1.1772 ~ 1.1850 in) ----
EX 31.9 ~ 32.1 mm
(1.2559 ~ 1.2638 in) ----
“B” face width IN 2.25 mm (0.0900 in) ----
EX 2.26 mm (0.0890 in) ----
“C” seat width IN 0.9 ~ 1.1 mm
(0.0354 ~ 0.0433 in) 1.6 mm
(0.0630 in)
EX 0.9 ~ 1.1 mm
(0.0354 ~ 0.0433 in) 1.6 mm
(0.0630 in)
“D” margin thickness IN 0.85 ~ 1.15 mm
(0.0335 ~ 0.0452 in) ----
EX 0.85 ~ 1.15 mm
(0.0335 ~ 0.0452 in) ----
Stem outside diameter IN 5.975 ~ 5.990 mm
(0.2352 ~ 0.2358 in) 5.945 mm
(0.2341 in)
EX 5.960 ~ 5.975 mm
(0.2346 ~ 0.2352 in) 5.930 mm
(0.2335 in)
Guide inside diameter IN 6.000 ~ 6.012 mm
(0.2362 ~ 0.2367 in) 6.050 mm
(0.2559 in)
EX 6.000 ~ 6.012 mm
(0.2362 ~ 0.2367 in) 6.050 mm
(0.2559 in)
Stem-to-guide clearance IN 0.010 ~ 0.037 mm
(0.0004 ~ 0.0015 in) 0.08 mm
(0.0031 in)
EX 0.025 ~ 0.052 mm
(0.0010 ~ 0.0020 in) 0.10 mm
(0.0039 in)
Item Standard Limit
B
C
D
A
Head Diameter Face Width Seat Width Margin Thickness