Kymco MO KXR 50 Service Manual - chap 09 (trasmissione)
9. DRIVE AND DRIVEN PULLEYS
9-0
Mongoose/KXR 90/50
9
DRIVE AND DRIVEN PULLEYS
SERVICE INFORMATION ...........................................................9-2
LEFT CRANKCASE COVER/KICK STARTER..............................9-4
DRIVE PULLEY ..........................................................................9-7
CLUTCH/DRIVEN PULLEY.........................................................9-9
9
9. DRIVE AND DRIVEN PULLEYS
9-1
Mongoose/KXR 90/50
9. DRIVE AND DRIVEN PULLEYS
9-2
Mongoose/KXR 90/50
SERVICE INFORMATION
GENERAL INSTRUCTIONS
• The drive pulley, clutch and driven pulley can be serviced with the engine installed in the frame.
• Avoid getting grease and oil on the drive belt and pulley faces. Remove any oil or grease from
them to minimize the slipping of drive belt and drive pulley.
SPECIFICATIONS (Mongoose/KXR 90)
Item
Standard (mm)
Service Limit (mm)
Movable drive face bushing I.D.
23.989_ 24.052
24.06
Drive face collar O.D.
23.96_ 23.974
23.94
Drive belt width
17.5
16.5
Clutch lining thickness
4.5
2.0
Clutch outer I.D.
112.0_ 112.2
112.5
Driven face spring free length
145.5
137.5
Driven face O.D.
33.965_ 33.985
33.94
Movable driven face I.D.
34.000_ 34.025
34.06
Weight roller O.D.
15.92_ 16.08
15.4
SPECIFICATIONS (Mongoose/KXR 50)
Item
Standard (mm)
Service Limit (mm)
Movable drive face bushing I.D.
20.036_ 20.085
20.6
Drive face collar O.D.
20.01_ 20.025
19.98
Drive belt width1817.5
Clutch lining thickness
3.5
1.0
Clutch outer I.D.
107_ 107.2
107.5
Driven face spring free length
98.1
92.8
Driven face O.D.
33.965_ 33.985
33.94
Movable driven face I.D.
34.0_ 34.025
34.06
Weight roller O.D.
15.92_ 16.08
15.4
9. DRIVE AND DRIVEN PULLEYS
9-3
Mongoose/KXR 90/50
TORQUE VALUES
Drive face nut 5.5_ 6.5kgf-m (Mongoose/KXR 90)
3.5_ 4.5kgf-m (Mongoose/KXR 50)
Clutch outer nut 3.5_ 4.5kgf-m
Drive plat nut 5.0_ 6.0kgf-m
SPECIAL TOOLS
Universal holder E017 Clutch spring compressor E034
Bearing puller E037 Oil seal and bearing install E014
TROUBLESHOOTING
Engine starts but motorcycle won’t move Lack of power
• Worn drive belt • Worn drive belt
• Broken ramp plate • Weak driven face spring
• Worn or damaged clutch lining • Worn weight roller
• Broken driven face spring • Fouled drive face
Engine stalls or motorcycle creeps
• Broken clutch weight spring
9. DRIVE AND DRIVEN PULLEYS
9-4
Mongoose/KXR 90/50
LEFT CRANKCASE COVER/KICK
STARTER
REMOVAL
Remove left foot board. (See page 2-7)
Remove the eight left crankcase cover bolts
and left crankcase cover.
Remove the gasket and dowel pins.
KICK STARTER
DISASSEMBLY
Remove the kick lever from the kick starter
spindle.
Remove the circlip and washer from the kick
starter spindle.
Remove three bolts at the kick starter spindle
cover, then remove kick starter spindle cover.
Gently turn the kick starter spindle to remove
the starter driven gear together with the
friction spring.
Remove the kick starter spindle and return
spring from the left crankcase cover.
Remove the kick starter spindle bushings.
Return Spring
Kick Starter Spindle
Friction Spring
Starter Driven Gear
Kick Starter Spindle
Circlip
Washer
Bolts
Left Crankcase Cover
Bolts
Kick Starter Spindle
Cover
Use specified genuine parts for
replacement.
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