Yamaha RS90K Manuel D'atelier page 738

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