Yamaha YXR660FAS Service Manual download pdf (Page 36)

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SPEC

ENGINE SPECIFICATIONS

Piston

Piston to cylinder clearance 0.050 ~ 0.070 mm

(0.0020 ~ 0.0028 in)

0.15 mm

(0.0059 in)

Piston size “D” 99.945 ~ 99.995 mm

(3.9348 ~ 3.9368 in)

----

Measuring point “H” 2.5 mm (0.10 in) ----

Piston off-set 1.0 mm (0.0394 in) ----

Off-set direction Intake side ----

Piston pin bore inside diameter 22.004 ~ 22.015 mm

(0.8663 ~ 0.8667 in)

22.045 mm

(0.8679 in)

Piston pin outside diameter 21.991 ~ 22.000 mm

(0.8658 ~ 0.8661 in)

21.971 mm

(0.8650 in)

Piston rings

Top ring

Type Barrel ----

Dimensions (B × T) 1.2 × 3.8 mm

(0.0472 × 0.1496 in)

----

End gap (installed) 0.30 ~ 0.45 mm

(0.0118 ~ 0.0177 in)

0.70 mm

(0.0276 in)

Side clearance (installed) 0.04 ~ 0.08 mm

(0.0016 ~ 0.0031 in)

0.13 mm

(0.0051 in)

2nd ring

Type Taper ----

Dimensions (B × T) 1.2 × 4.0 mm

(0.0472 × 0.1575 in)

----

End gap (installed) 0.30 ~ 0.45 mm

(0.0118 ~ 0.0177 in)

0.80 mm

(0.0315 in)

Side clearance 0.03 ~ 0.07 mm

(0.0012 ~ 0.0028 in)

0.13 mm

(0.0051 in)

Item Standard Limit

H

D

T

B

B

T

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