Aeon 350cc, Service Manual

Page: 79 / 192

ENGINE
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3. Watch the gap along the crankcase mating surface and
separate the crankcase evenly.
4. Once the crankshaft bearing is free from the case, the
crankshaft and cam chain can be removed by hand for service.
CRANKSHAFT REMOVAL
1. Remove right hand crankcase with soft-faced hammer.
2. Press the crankshaft out. Use care not to damage the
crankshaft oil passage on the right end crankshaft end.
NOTE: Use care not to damage the crankshaft end.
CRANKSHAFT / CAM & OIL CHAIN /
SPROCKET INSPECTION
1. Inspect the crankshaft main bearings and cam and oil pump
chain sprocket for wear or damage.
NOTE: Due to extremely close tolerances and
minimal wear, the bearings must be inspected
visually, and by feel. Look for signs of discoloration,
scoring or galling. Turn the outer race of each
bearing.
The bearings should turn smoothly and quietly. The inner race
of each bearing should fit tightly in the crankshaft. The outer
race should be firm with minimal side-to-side movement and
no detectable up and down movement.
2. Replace the crankshaft if the components fail visual
inspection.
3. Measure crankshaft run out, Replace crankshaft and both
bearings if out of specification.
Maximum crankshaft run out
0.05mm
4. The connecting rod utilizes a roller bearing. Clearance is
minimal and cannot be measured. Visually inspect bearing
journal for scoring, damage or excessive wear. Replace
crankshaft if it fails visual inspection.