Kymco MO KXR 250 Service Manual - chap 09 (trasmissione)
9. DRIVE AND DRIVEN PULLEYS
9-0
Mongoose/KXR 250
9
DRIVE AND DRIVEN PULLEYS
SERVICE INFORMATION ...........................................................9-2
TROUBLESHOOTING .................................................................9-2
LEFT CRANKCASE COVER ........................................................9-3
DRIVE PULLEY ..........................................................................9-4
CLUTCH/DRIVEN PULLEY.........................................................9-7
9
9. DRIVE AND DRIVEN PULLEYS
9-1
Mongoose/KXR 250
9. DRIVE AND DRIVEN PULLEYS
9-2
Mongoose/KXR 250
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
Item
Standard (mm)
Service Limit (mm)
Movable drive face bushing I.D.
26.989_ 27.052
27.06
Drive face collar O.D.
26.96_ 26.974
26.94
Drive belt width
23.6_ 24.4
22
Clutch lining thickness
æ
0.5
Clutch outer I.D.
153.0_ 153.2
153.5
Driven face spring free length
æ
131
Driven face O.D.
39.965_ 39.985
39.94
Movable driven face I.D.
40.000_ 40.025
40.06
Weight roller O.D.
22.92_ 23.08
22.8
TORQUE VALUES
Drive face nut 9.0_ 10.0kgf-m
Clutch outer nut 5.0_ 6.0kgf-m
Drive plat nut 5.0_ 6.0kgf-m
SPECIAL TOOLS
Universal holder E017 Clutch spring compressor E027
Bearing puller E008 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
9-3
Mongoose/KXR 250
LEFT CRANKCASE COVER
REMOVAL
Remove the five bolts.
Remove the starting cover.
Remove the dowel pins and gasket.
Remove the three bolts.
Remove the outlet hose cover.
Loosen the drive belt air inlet and outlet hose
band screws and disconnect them from the
left crankcase cover.
Bolts
Starting Cover
Dowel Pins
Gasket
Bolts
Outlet Hose Cover
Screws
Inlet Hose
Outlet Hose
9. DRIVE AND DRIVEN PULLEYS
9-4
Mongoose/KXR 250
Remove the left crankcase cover bolts and left
crankcase cover.
Remove the gasket and dowel pins.
INSPECTION
Inspect the bearing for allow play in the left
crankcase cover or the bearing turns roughly _
Replace.
INSTALLATION
Install the dowel pins and new gasket.
Reverse the “LEFT CRANKCASE COVER
REMOVAL” procedures.
Install the left crankcase cover and tighten the
bolts.
Connect the drive belt air inlet and outlet hose
and tighten band screws.
Install the starting cover and outlet hose
cover.
DRIVE PULLEY
REMOVAL
Remove the left crankcase cover. (Refer to the
“LEFT CRANKCASE COVER
REMOVAL” section in the chapter 9)
Hold the drive pulley using a universal
holder and remove the drive face nut and
washer.
Remove the drive pulley.
Universal Holder E017
Bolts
Bearing
Dowel Pins
Gasket
Special
Drive Pulley
Nut
Universal Holder
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