Yamaha JT1 Series Service Manual page 30

ENGINE·
Clutch
B. Removing the Clutch Boss
Install the clutch holding tool on the dutch boss.
Loosen the lock nut. and then remove the clutch boss.
(19 mm)
C. Checking the Clutch Spring
If the free length of the spring is 1 mm. (0.04 in.) or
more shorter than the standard free length, replace it.
(Slide calipers)
Free length 34 mm. (1.340 m)
D.
Checking the Friction Plates
Measure the fnct1on plate at several points for wear.
Replace it if it is worn more than 0.35mm.(0.0137in.)
or more. Also replace 11 1f uneven contact 1s quite
evident.
(Slide calipers)
Standard thickness= 3.5 mm. (0.137 in.)
Wear limit= 3.15 mm (0.124 in.)
3.5 mm(Standard Thickness)
(
I
Fig 3-9-4
Fig. 3-9-5
Fig. 3-9-6
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