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10
. CRANKCASE/CRANKSHAFT
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 5)
Carburetor ( Section 12)
Oil pump ( Section 4)
Reed valve ( Section 12)
• 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
Item
Connecting rod big end side
clearance
Connecting rod big end radial
clearance
Crankshaft runout A/B
SPECIAL TOOLS
Crankcase puller
Universal bearing puller
Crankcase assembly collar
Crankcase assembly tool
TROUBLESHOOTING
Abnormal engine noise
• Excessive crank journal bearing play
• Excessive crankpin bearing play
• Excessive transmission bearing play
10-1
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Driven pulley ( Section 7)
A.C. generator ( Section9)
Cylinder head/cylinder ( Section 6)
Standard (mm)
B&W50
Bearing outer driver handle A
Bearing outer driver, 42x47mm
Bearing driver pilot, 20mm
Bearing outer driver, 37x40mm
Bearing driver pilot, 17mm
BET & WIN 50
Service Limit (mm)
B&W50
0.60
0.04
0.15/0.10
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