Yamaha YFM90RA Model Vehicle User Manual


 
SPEC
ENGINE SPECIFICATIONS
----
Barrel
1.0 × 2.1 mm
(0.0394 × 0.0827 in)
----
0.10 ~ 0.25 mm
(0.0039~0.0098in)
0.45 mm
(0.0177in)
0.015 ~0.055 mm
(0.0006~0.0022in)
0.09 mm
(0.0035in)
----Taper
1.0 × 2.0 mm
0.0394 × 0.0787 in)
----
0.25 ~ 0.40 mm
(0.0098~0.0157in)
0.55mm
(0.0217in)
0.015 ~ 0.055 mm
(0.0006~0.0022in)
0.09mm
(0.0035in)
2.0 × 1.9 mm
(0.0787 × 0.0748 in)
0.20 ~ 0.70 mm
(0.0079~0.0276in)
----
----
Crankshaft
Crankwidth 44.10~44.15mm
(1.7362~1.7382in)
----
0.04 mm----Runout limit C1
(0.0016in)
0.04 mm----C2
(0.0016in)
Big end side clearance “D” 0.10~0.30mm
(0.0039~0.0118in)
0.50 mm
(0.0197in)
Big end radial clearance “E” 0.007~0.015mm
(0.0003~0.0006in)
----
Small end free play “F” 0.80~1.00mm
(0.0315~0.0394in)
1.50mm
(0.0591in)
F
A
D
C1
C2
E
A
LimitStandardItem
Piston rings
Top ring
Type
Dimensions (B × T)
End gap (installed)
Side clearance (installed)
2nd ring
Type
Dimensions (B × T)
End gap (installed)
Side clearance
T
B
B
T
Oil ring
Dimensions (B × T)
End gap (installed)
B
T
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