Yamaha XT660R S Service Manual page 34

Item
Cylinder
Cylinder arrangement
Bore × stroke
Compression ratio
Bore
Maximum taper
Maximum out-of-round
Piston
Piston-to-cylinder clearance
Diameter D
Height H
Piston pin bore (in the piston)
Diameter
Offset
Offset direction
Piston pin
Outside diameter
Piston-pin-to-piston-pin-bore clear-
ance
Piston rings
Top ring
Ring type
Dimensions (B × T)
End gap (installed)
Ring side clearance
ENGINE SPECIFICATIONS
Forward-inclined single cylinder
100.0 × 84.0 mm (3.94 × 3.31 in)
10 : 1
100.000 ~ 100.010 (3.9370 ~ 3.9374 in)
----
----
0.030 ~ 0.055 mm (0.0012 ~ 0.0022 in)
99.955 ~ 99.970 mm (3.9352 ~ 3.9358 in)
H
D
10.0 mm (0.39 in)
23.004 ~ 23.015 mm (0.9057 ~ 0.9061 in) 23.045 mm
0.50 mm (0.0197 in)
Intake side
22.991 ~ 23.000 (0.9052 ~ 0.9055 in)
0.004 ~ 0.024 mm (0.0002 ~ 0.0009 in)
B
T
Barrel
1.20 × 3.80 mm (0.047 × 0.150 in)
0.20 ~ 0.35 mm (0.0079 ~ 0.0138 in)
0.030 ~ 0.080 mm (0.0012 ~ 0.0031 in)
http://manuals.magnamaniac.com
Standard
2 - 7
SPEC
Limit
----
----
----
100.080 mm
(3.9402 in)
0.05 mm
(0.002 in)
0.05 mm
(0.002 in)
0.13 mm
(0.0051 in)
----
----
(0.9073 in)
----
----
22.971 mm
(0.9044 in)
0.074 mm
(0.0029 in)
----
----
0.60 mm
(0.0236 in)
0.13 mm
(0.0051 in)