Yamaha RS90K, Service Manual

Page: 738 / 841

9-7
SPEC
MAINTENANCE SPECIFICATIONS
Piston ring:
Sectional sketch
Top ring
Ring type Barrel
Dimensions (B
×
T) 1.00
×
2.80 mm (0.039
×
0.110 in)
2nd ring
Ring type Taper
Dimensions (B
×
T) 1.00
×
2.90 mm (0.039
×
0.114 in)
Oil ring
Dimensions (B
×
T) 2.00
×
2.50 mm (0.079
×
0.098 in)
End gap (installed)
Top ring 0.35 ~ 0.45 mm (0.014 ~ 0.018 in)
2nd ring 0.75 ~ 0.85 mm (0.030 ~ 0.033 in)
Oil ring 0.20 ~ 0.60 mm (0.008 ~ 0.024 in)
Side clearance (installed)
Top ring 0.030 ~ 0.070 mm (0.0012 ~ 0.0028 in)
2nd ring 0.020 ~ 0.060 mm (0.0008 ~ 0.0024 in)
Connecting rod:
Crankshaft-pin-to-big-end-bearing clearance 0.033 ~ 0.050 mm (0.0013 ~ 0.0020 in)
Bearing color code
0 = White-White 1 = Blue-Blue 2 = Black-Black
3 = Brown-Brown 4 = Green-Green 5 = Yellow-Yellow
Crankshaft:
Measuring point 1 62.0 mm (2.44 in)
Measuring point 2 100.0 mm (3.94 in)
Width A 62.25 ~ 62.65 mm (2.451 ~ 2.467 in)
Width B 234.65 ~ 235.65 mm (9.24 ~ 9.28 in)
Crankshaft runout C 0.03 mm (0.0012 in)
Big end side clearance D 0.160 ~ 0.262 mm (0.0063 ~ 0.0103 in)
Crankshaft-journal-to-crankshaft-journal-
bearing clearance 0.027 ~ 0.045 mm (0.0011 ~ 0.0018 in)
Bearing color code 2 = Black 3 = Brown 4 = Green 5 = Yellow
6 = Pink 7 = Red 8 = White
Carburetor:
Type
×
quantity CVK40
×
3
Manufacturer KEIHIN
I.D. mark 8ES1 00
Main jet (M.J) #148
Main air jet (M.A.J) #70
Jet needle (J.N) N425-BSJ00
Needle jet (N.J) W9554-26538#6
Pilot jet (P.J) #45
Pilot air jet (P.A.J) #120
Pilot outlet (P.O) 0.9
Model RS90/RS90R/RSG90/RS90M/RST90/RST90TF
T
B
B
T
B
T
D
C C
A
B
1 2