Yamaha XT660 2004, Service Manual

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SPEC
ENGINE SPECIFICATIONS
Rocker arm/rocker arm shaft
Rocker arm inside diameter 12.000 ~ 12.018 mm (0.4724 ~ 0.4731 in) 12.036 mm
(0.4739 in)
Shaft outside diameter 11.981 ~ 11.991 mm (0.4717 ~ 0.4721 in) 11.955 mm
(0.4707 in)
Arm-to-shaft clearance 0.009 ~ 0.037 mm (0.0004 ~ 0.0015 in) 0.081 mm
(0.0032 in)
Valves, valve seats, valve guides
Valve clearance (cold)
Intake 0.09 ~ 0.13 mm (0.0035 ~ 0.0051 in) ----
Exhaust 0.16 ~ 0.20 mm (0.0063 ~ 0.0079 in) ----
Valve dimensions
Valve head diameter A
Intake 37.90 ~ 38.10 mm (1.4921 ~ 1.5000 in) ----
Exhaust 31.90 ~ 32.10 mm (1.2559 ~ 1.2638 in) ----
Valve face width B
Intake 2.260 mm (0.0890 in) ----
Exhaust 1.91 ~ 2.62 mm (0.075 ~ 0.103 in) ----
Valve seat width C
Intake 1.00 ~ 1.20 mm (0.0394 ~ 0.0472 in) 1.6 mm
(0.06 in)
Exhaust 1.00 ~ 1.20 mm (0.0394 ~ 0.0472 in) 1.6 mm
(0.06 in)
Valve margin thickness D
Intake 0.80 ~ 1.20 mm (0.0315 ~ 0.0472 in) ----
Exhaust 0.80 ~ 1.20 mm (0.0315 ~ 0.0472 in) ----
Valve stem diameter
Intake 5.975 ~ 5.990 mm (0.2352 ~ 0.2358 in) 5.945 mm
(0.2341 in)
Exhaust 5.960 ~ 5.975 mm (0.2346 ~ 0.2352 in) 5.930 mm
(0.2335 in)
Valve guide inside diameter
Intake 6.000 ~ 6.012 mm (0.2362 ~ 0.2367 in) 6.05 mm
(0.2382 in)
Exhaust 6.000 ~ 6.012 mm (0.2362 ~ 0.2367 in) 6.05 mm
(0.2382 in)
Item Standard Limit
B
C
D
A
Head Diameter Face Width Seat Width Margin Thickness