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1 Chain and sprocket part number
È Parts name
Ì Drive sprocket
Í Driven sprocket
Î Chain
2 Gear ratio
È Drive gear
É Driven gear
38 teeth
39 teeth
40 teeth
3 Secondary sheave spring
É Spring rate
È Part No.
N · mm/rad
(kgf · mm/rad)
90508-500B1
6003 (612.6)
6.19 (0.631), 35.34
90508-536A9
7147 (729.3)
7.25 (0.740), 41.40
90508-556A2
8314 (848.4)
8.49 (0.866), 48.48
90508-556A7
9460 (965.3)
90508-60012
11876 (1211.0) 12.32 (1.26), 70.35
90508-60007
12654 (1290.3) 13.45 (1.37) 76.80
4 Secondary spring twist angle
È Seat
É Sheave
1
2
3
É Teeth & links
18 teeth
19 teeth
20 teeth
21 teeth
22 teeth
23 teeth
24 teeth
38 teeth
39 teeth
40 teeth
68 links
70 links
18 teeth
19 teeth
—
—
2.17
2.05
68 links
68 links
2.22
2.11
68 links
68 links
Ê Preload
Ì Wire gauge
Ë Color
N/mm (kgf/mm)
(lbf/in)
Brown
5.0 (0.197)
Red
5.3 (0.209)
Green
5.5 (0.217)
10.18 (1.039),
Silver
5.5 (0.217)
58.13
Pink
6.0 (0.236)
White
6.0 (0.236)
0
10°
20°
30°
GEAR SELECTION
Ê Parts no.
8FA-17682-80
8FA-17682-90
8FA-17682-00
8FA-17682-10
8FA-17682-20
8FA-17682-30
8FA-17682-40
8FB-47587-80
8FB-47587-90
8FB-47587-00
94890-09068
94890-09070
20 teeth
21 teeth
22 teeth
1.90
1.81
68 links
68 links
68 links
1.95
1.86
68 links
68 links
70 links
2.00
1.91
68 links
70 links
70 links
Î Free length
Í No. of coils
mm (in)
mm (in)
5.19
75 (2.95)
5.53
75 (2.95)
5.53
75 (2.95)
4.86
75 (2.95)
5.53
75 (2.95)
5.19
75 (2.95)
3
40°
50°
60°
10
INSP
ADJ
Ë Standard
RST90GT "Europe"/
RST90TF "Europe"
RST90TF "Canada"
RST90GT "Canada"
RST90GT/RST90TF
RST90GT "Europe"/
RST90TF
RST90GT "Canada"
23 teeth
24 teeth
1.73
1.65
1.58
70 links
70 links
1.77
1.70
1.63
70 links
70 links
1.82
1.74
1.67
70 links
70 links
Ï Outside
Ð Standard
diameter
mm (in)
69.5 (2.74)
69.5 (2.74)
69.5 (2.74)
69.5 (2.74)
69.5 (2.74)
RST90GT "Canada"
RST90GT "Europe"/
69.5 (2.74)
RST90TF
6
9
70°
100°
80°
110°
90°
120°
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Troubleshooting
