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10. CRANKCASE/CRANKSHAFT SUPER8 50 2T
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) Driven pulley ( Section 9)
Carburetor ( Section 11) A.C. generator ( Section 7)
Oil pump ( Section 4) Cylinder head/cylinder ( Section 6)
Reed valve ( Section 11)
· 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
SUPER8 50 2T
Item Standard (mm) Service Limit (mm)
Connecting rod big end side
clearance 0.60
Connecting rod big end radial
clearance 0.04
Crankshaft runout A/B 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
10-2