SERVICING INFORMATION 18-3
TRANSMISSION Unit: mm (in) Except ratio
DRIVE CHAIN Unit: mm (in)
CARBURETOR
ITEM STANDARD LIMIT
Primary reduction ratio 3.444 (62/18) —
Final reduction ratio 3.357 (47/14) RM85 —
3.615 (47/13) RM85L —
Gear ratios Low 2.545 (28/11) —
2nd 1.933 (29/15) —
3rd 1.571 (22/14) —
4th 1.333 (20/15) —
5th 1.166 (21/18) —
Top 1.045 (23/22) —
Shift fork to groove clearance No.1, No.2
& No.3
0.05 – 0.25
(0.002 – 0.010)
0.45
(0.018)
Shift fork groove width
No.1
3.95 – 4.05
(0.156 – 0.159)
—
No.2 &
No.3
4.45 – 4.55
(0.175 – 0.179)
—
Shift fork thickness
No.1
3.80 – 3.90
(0.150 – 0.154)
—
No.2 &
No.3
4.30 – 4.40
(0.169 – 0.173)
—
ITEM STANDARD LIMIT
Drive chain Type D.I.D 428DS —
Links
118 RM85 —
122 RM85L —
20-pitch length —
259
(10.2)
Drive chain slack 40 – 50
(1.6 – 2.0)
—
ITEM SPECIFICATION
Carburetor type KEIHIN PE28
Bore size 28 mm
I.D. No. 03B3
Float height 19.0 ± 0.5 mm (0.75 ± 0.02 in)
Main jet (M.J.) #128
Jet needle (J.N.) 24NAAH-3rd
Slow jet (S.J.) #50
Air screw (P.A.S.) 2 turns out
Throttle cable play 2 – 4 mm (0.08 – 0.16 in) at the throttle grip
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