Yamaha YFM400FAR, Service Manual

Page: 383 / 481

– 9 –
SPEC
Piston rings:
Top ring
Type Barrel ----
Dimensions (B
×
T) 1.2
×
3.3 mm (0.05
×
0.13 in) ----
End gap (installed) 0.20 ~ 0.40 mm
(0.008 ~ 0.016 in) 0.65 mm
(0.0256 in)
Side clearance (installed) 0.03 ~ 0.08 mm
(0.0012 ~ 0.0032 in) 0.13 mm
(0.0051 in)
2nd ring
Type Taper ----
Dimensions (B
×
T) 1.5
×
3.4 mm (0.06
×
0.13 in) ----
End gap (installed) 0.20 ~ 0.40 mm
(0.008 ~ 0.016 in) 0.75 mm
(0.0295 in)
Side clearance 0.03 ~ 0.07 mm
(0.0012 ~ 0.0028 in) 0.13 mm
(0.0051 in)
Oil ring
Dimensions (B
×
T) 2.8
×
2.8 mm (0.11
×
0.11 in) ----
End gap (installed) 0.3 ~ 0.9 mm (0.01 ~ 0.04 in) ----
Crankshaft:
Crank width “A” 58.95 ~ 59.00 mm
(2.321 ~ 2.323 in) ----
Runout limit C1 ---- 0.03 mm
(0.0012 in)
C2 ---- 0.03 mm
(0.0012 in)
Big end side clearance “B” 0.35 ~ 0.85 mm
(0.0138 ~ 0.0335 in) 1.0 mm
(0.04 in)
Big end radial clearance “E” 0.004 ~ 0.023 mm
(0.0002 ~ 0.0009 in) ----
Item Standard Limit
T
B
B
T
B
T
E
A
B
C1
C2
MAINTENANCE SPECIFICATIONS