KYMCO MX'ER 50 - Crankcase;Crankshaft; Service Information; Troubleshooting

11. CRANKCASE/CRANKSHAFT
11-2
MX’er 50
SERVICE INFORMATION
GENERAL INSTRUCTIONS
• This section covers crankcase separation to service the crankshaft.
• The following parts must be removed before separating the crankcase.
Engine (
!
Section 6) Driven pulley (
!
Section 9)
Carburetor (
!
Section 5) A.C. generator (
!
Section 8)
Oil pump (
!
Section 4) Cylinder head/cylinder (
!
Section 7)
Reed valve (
!
Section 5)
• When the left crankcase must be replaced, remove the following part in addition to the above.
Final reduction removal
• Special tools must be used for crankshaft and crankcase assembly. When separating the
crankcase, the bearing will remain in the crankcase and it should be removed. When, assembling,
drive a new bearing into the crankcase and install a new oil seal.
SPECIFICATIONS
MX’er 50
Item
Standard (mm)
Service Limit (mm)
Connecting rod big end side
clearance
æ
0.60
Connecting rod big end radial
clearance
æ
0.04
Crankshaft runout A/B
æ
0.15/0.10
SPECIAL TOOLS
Crankcase puller Bearing outer driver handle A
Universal bearing puller Bearing outer driver, 42x47mm
Crankcase assembly collar Bearing driver pilot, 20mm
Crankcase assembly tool Bearing outer driver, 37x40mm
Bearing driver pilot, 17mm
TROUBLESHOOTING
Abnormal engine noise
• Excessive crank journal bearing play
• Excessive crankpin bearing play
• Excessive transmission bearing play
www.PlanDeGraissage.org