Kymco MO BW250 Service Manual - chap 08 (trasmissione)
8. DRIVE AND DRIVEN PULLEYS/
KICK STARTER
8-0
Bet & Win 2 50
8
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DRIVE AND DRIVEN PULLEYS/
KICK STARTER
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SCHEMATIC DRAWING ---------------------------------------------- 8- 1
SERVICE INFORMATION -------------------------------------------- 8- 2
TROUBLESHOOTING ------------------------------------------------- 8- 2
LEFT CRANKCASE COVER------------------------------------------ 8- 3
DRIVE PULLEY -------------------------------------------------------- 8- 4
CLUTCH/DRIVEN PULLEY ------------------------------------------ 8- 8
8
8. DRIVE AND DRIVEN PULLEYS/
KICK STARTER
8-1
Bet & Win 2 50
SCHEMATIC DRAWING
8. DRIVE AND DRIVEN PULLEYS/
KICK STARTER
8-2
Bet & Win 2 50
SERVICE INFORMATION
GENERAL INSTRUCTIONS
• The drive pulley, clutch and driven pulley can be serviced with the engine installed.
• 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 driven face bushing I.D.
40.000_ 40.025
40.06
Driven face collar O.D.
39.965_ 39.955
39.85
Drive belt width
23.6_ 24.4
22.0
Clutch lining thickness
3.963_ 4.037
2.0
Clutch outer I.D.
153.0_ 153.2
153.5
Weight roller O.D
22.92_ 23.08
22.0
Driven face Boss O.D.
26.960_ 26.974
26.90
Movable driven face I.D.
27.052_ 26.989
27.13
Weight roller W.DTH
18.9_ 19.00
18.00
TORQUE VALUES
Drive face nut 88.2_ 98N-m
Clutch outer nut 49.0_ 58.8N-m
Clutch drive plate nut 49.0_ 58.8N-m
SPECIAL TOOLS
Universal holder Clutch spring compressor
Bearing driver Lock nut wrench, 39mm
Kick starter spring remover
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 • Faulty driven face
Engine stalls or motorcycle creeps
• Broken clutch weight spring
8. DRIVE AND DRIVEN PULLEYS/
KICK STARTER
8-3
Bet & Win 2 50
LEFT CRANKCASE COVER
REMOVAL
Loosen the drive belt air tube band screw.
Remove the four bolts on the left crankcase
surface cover.
Remove the left crankcase cover bolts and left
crankcase covers.
Remove the seal rubber and dowel pins.
INSTALLATION
Install the dowel pins and the seal rubber.
Install the left crankcase cover.
Install the cable clamp to the specified
location. Install and tighten the left crankcase
cover bolts.
Left Crankcase Cover
Air Tube Band
Bolts
Dowel Pins
Seal Rubber
Left Crankcase Cover
Bolts
Cover
8. DRIVE AND DRIVEN PULLEYS/
KICK STARTER
8-4
Bet & Win 2 50
Install the drive belt air tube and tighten the
tube band screw.
DRIVE PULLEY
REMOVAL
Remove the left crankcase cover.
Hold the drive pulley using an universal
holder and remove the drive face nut and
washer.
Remove the drive pulley face.
Universal Holder
Remove the drive belt from the movable drive
face.
INSPECTION
Check the drive belt for cracks, separation or
abnormal or excessive wear.
Measure the drive belt width.
Service Limit: 22.0mm replace if below
Drive Pulley Face
Universal Holder
• Use specified genuine parts for
replacement.
＊
Movable Drive Face
Drive Belt
Tube Band Screw
Special
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