Honda CRF250X Owner's Manual & Competition Handbook page 83

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Piston/Piston Pin/Piston Ring Inspection
We recommend you consult the Shop Manual or
your authorized Honda dealer for correct Service
Limit measurements.
Piston Ring Installation
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 Rings/Piston Pin
top ring
oil ring
mark
top ring
side
rail
spacer
side
rail
Servicing Your Honda
oil
ring
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