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11. CRANKCASE/CRANKSHAFT VITALITY 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 6 (2-stroke))
-Cylinder/piston ( Chapter 7)
-Drive and driven pulleys ( Chapter 9)
-A.C. generator ( Chapter 8)
SPECIFICATIONS (2-Stroke)
Item Standard (mm) Service Limit (mm)
Connecting rod big end side clearance 0.6
Crankshaft Connecting rod big end radial clearance 0.04
Run out A/B 0.1/0.15
SPECIFICATIONS (4-Stroke)
Item Standard (mm) Service Limit (mm)
Connecting rod small end free play 0.050.4 0.6
Crankshaft Connecting rod big end radial clearance 00.008 0.05
Run out 0.10
TORQUE VALUES
Crankcase bolt 0.81.2kgf-m
Cam chain tensioner slipper bolt 0.81.2kgf-m (4-Stroke)
SPECIAL TOOLS (2-stroke)
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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