Kymco MO KXR 50 Service Manual - chap 11 (albero motore)
11.CRANKSCASE/CRANKSHAFT
11-0
Mongoose/KXR 90/50
11
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CRANKCASE/CRANKSHAFT
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SERVICE INFORMATION -------------------------------------------- 11- 3
CRANKCASE/CRANKSHAFT (Mongoose/KXR 90)---------------- 11- 4
CRANKCASE/CRANKSHAFT (Mongoose/KXR 50)---------------- 11- 7
11
11.CRANKCASE/CRANKSHAFT
11-1
Mongoose/KXR 90/50
Mongoose/KXR 90
11.CRANKSCASE/CRANKSHAFT
11-2
Mongoose/KXR 90/50
Mongoose/KXR 50
11.CRANKCASE/CRANKSHAFT
11-3
Mongoose/KXR 90/50
SERVICE INFORMATION
GENERAL INSTRUCTIONS
• This section covers crankcase separation to service the crankshaft. The engine must be removed
for this operation.
• The following parts must be removed before separating the crankcase.
-Cylinder head (!Chapter 7 (Mongoose/KXR 90))
-Cylinder/piston (!Chapter 8)
-Drive and driven pulleys (!Chapter 9)
-A.C. generator (!Chapter 14)
-Starter clutch (!Chapter 16)
-Oil pump (!Chapter 4)
SPECIFICATIONS (Mongoose/KXR 90)
Item
Standard (mm)
Service Limit (mm)
Connecting rod small end free play
0.05_ 0.4
0.6
Crankshaft
Connecting rod big end radial clearance
0_ 0.008
0.05
Run outæ0.10
SPECIFICATIONS (Mongoose/KXR 50)
Item
Standard (mm)
Service Limit (mm)
Connecting rod big end side clearance
æ
0.6
Crankshaft
Connecting rod big end radial clearance
æ
0.04
Run out A/B
æ
0.1/0.15
TORQUE VALUES
Crankcase bolt 0.8_ 1.2kgf-m
Cam chain tensioner slipper bolt 0.8_ 1.2kgf-m (Mongoose/KXR 90)
SPECIAL TOOLS (Mongoose/KXR 50)
Crankcase puller E026
Universal bearing puller E030
Crankshaft install tool E016
Crankcase assembly tool E024
Oil seal and bearing install tool E014
TROUBLESHOOTING
Abnormal engine noise
• Excessive crank journal bearing play
• Excessive crankpin bearing play
• Excessive transmission bearing play
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