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Servicing Your Honda 77
Piston/Piston Rings/Piston Pin
We recommend you consult the Service Manual or
your dealer for correct Service Limit
measurements.
1. Remove the carbon deposits from the piston
crown and piston ring grooves with the
removed ring.
2. Apply engine oil to the piston rings and install
them.
NOTICE
Do not damage the piston ring by spreading the
ends too far.
Do not damage the piston during piston ring
installation.
• To install the oil ring, install the spacer first,
then install the side rails.
• Install the top ring on the piston with the
marking side facing up.
3. After installing the rings they should rotate
freely, without sticking.
Space the ring end gaps 180 degrees apart
between the top ring and the upper side rail.
Space the ring end gaps 90 degrees apart
between the upper side rail, spacer, and the
lower side rail.
Piston/Piston Pin/Piston Ring Inspection Piston Ring Installation
top ring
oil ring
top ring
mark
side
rail
oil
ring
side
rail
spacer
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