Aeon 350cc, Service Manual

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ENGINE
4-83
3. Install the bottom rail with the gap at least 30 from the
end of the expander on the side opposite the top rail gap.
4. Install the second ring with the mark facing up.
Position the end gap toward the rear (intake) side of the piston.
5. Install the top ring with the chamfered edge facing up.
6. Check to make sure the rings rotate freely in the groove
when compressed by hand.
PISTON INSTALLATION
CAUTION: Do not re-use cir-clips. Cir-clips become
deformed during the removal process. Do not
compress the new clip more than necessary to
prevent loss of radial tension. Severe engine damage
may result if cir-clips are re-used or deformed during
installation.
1. Install a new cir-clip on one side of the piston with the end
gap facing up or down .
2. Apply clean engine oil to the piston rings, ring lands, piston
pin bore, piston pin, and piston skirt.
Lubricate the connecting rod (both ends) and crankshaft main
bearing area.
3. IMPORTANT-- Install the piston on the connecting rod
with the ’IN” casting mark facing the intake side of engine.
The piston pin should be a push fit into the piston.
4. Install the other cir-clip with the gap facing up or down.
(See Caution with Step 3 above). Push the piston pin in both
directions to make sure the clips are properly seated in the
groove.
5. Place the dowel pins in the crankcase and install a new
cylinder base gasket.
6. Lubricate the piston and rings with assembly lube and install
a ring compressor on the piston assembly. Verify that the ring
gaps are 120
°
apart from each other before installation.
7. Push the rings into the taper using a metallic, blunt--edge
tool while holding the cylinder down.
This will help push the piston past the ring taper into the
cylinder.
8. Up-side-down cylinder then place the blunt--edge tool on
cylinder. Align it with cylinder.