Yamaha XT660R S Service Manual page 32

Item
Rocker arm/rocker arm shaft
Rocker arm inside diameter
Shaft outside diameter
Arm-to-shaft clearance
Valves, valve seats, valve guides
Valve clearance (cold)
Intake
Exhaust
Valve dimensions
A
Head Diameter
Valve head diameter A
Intake
Exhaust
Valve face width B
Intake
Exhaust
Valve seat width C
Intake
Exhaust
Valve margin thickness D
Intake
Exhaust
Valve stem diameter
Intake
Exhaust
Valve guide inside diameter
Intake
Exhaust
ENGINE SPECIFICATIONS
12.000 ~ 12.018 mm (0.4724 ~ 0.4731 in) 12.036 mm
11.981 ~ 11.991 mm (0.4717 ~ 0.4721 in) 11.955 mm
0.009 ~ 0.037 mm (0.0004 ~ 0.0015 in)
0.09 ~ 0.13 mm (0.0035 ~ 0.0051 in)
0.16 ~ 0.20 mm (0.0063 ~ 0.0079 in)
B
Face Width
37.90 ~ 38.10 mm (1.4921 ~ 1.5000 in)
31.90 ~ 32.10 mm (1.2559 ~ 1.2638 in)
2.260 mm (0.0890 in)
1.91 ~ 2.62 mm (0.075 ~ 0.103 in)
1.00 ~ 1.20 mm (0.0394 ~ 0.0472 in)
1.00 ~ 1.20 mm (0.0394 ~ 0.0472 in)
0.80 ~ 1.20 mm (0.0315 ~ 0.0472 in)
0.80 ~ 1.20 mm (0.0315 ~ 0.0472 in)
5.975 ~ 5.990 mm (0.2352 ~ 0.2358 in)
5.960 ~ 5.975 mm (0.2346 ~ 0.2352 in)
6.000 ~ 6.012 mm (0.2362 ~ 0.2367 in)
6.000 ~ 6.012 mm (0.2362 ~ 0.2367 in)
http://manuals.magnamaniac.com
2 - 5
Standard
C
Seat Width
SPEC
Limit
(0.4739 in)
(0.4707 in)
0.081 mm
(0.0032 in)
----
----
D
Margin Thickness
----
----
----
----
1.6 mm
(0.06 in)
1.6 mm
(0.06 in)
----
----
5.945 mm
(0.2341 in)
5.930 mm
(0.2335 in)
6.05 mm
(0.2382 in)
6.05 mm
(0.2382 in)