Honda 2009 CRF450X Owner's Manual & Competition Handbook page 85

Piston/Piston Pin/Piston Ring Inspection
We recommend you consult the Shop Manual or
your Honda dealer for correct Service Limit
measurements.
Piston Ring Installation
1. Remove the carbon deposits from the piston
head and piston ring grooves with the
removed ring (1).
(1) removed ring
2. Apply engine oil to each piston ring whole
surface and install them to the piston.
NOTICE
Do not damage the piston ring by spreading the
ends too far.
Do not damage the piston during piston ring
installation.
Piston/Piston Rings/Piston Pin
• 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 top ring and upper side rail.
Space the ring end gaps 90 degrees apart
between upper side rail, spacer and lower side
rail.
(1)
mark
Servicing Your Honda
HONDA O/M CRF450X (Eu) 3RMEY620 00X3R-MEY-6200
top ring
oil ring
top ring
side rail
oil
spacer
ring
side rail
piston
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