Honda CRF450R 2011, Owner'S Manual

Page: 94 / 1058

Piston/Piston Rings/Piston Pin
(cont’d)
Servicing Your Honda
85
1. Remove the carbon deposits from the piston
head and piston ring grooves with the removed
piston ring (1).
2. Apply engine oil to each piston ring whole
surface.
3. Install the spacer (2) first, then install the side
rails (3) to the piston (4).
4. Install the top ring (5) to the piston with “R”
mark (6) side facing up.
NOTICE
Do not damage the piston ring by spreading the
ends too far.
Do not damage the piston during piston ring
installation.
5. After installing the piston 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. Place clean shop towels (1) over the crankcase
opening to keep the piston pin clips from
falling into the crankcase.
2. Apply molybdenum disulfide oil (a mixture of
1/2 engine oil and 1/2 molybdenum disulfide
grease containing more than 3% molybdenum
disulfide additive) to the connecting rod small
end (2) inner surface.
Piston Ring Installation
(1) removed piston ring
(1)
(2) spacer (5) top ring
(3) side rails (6) “R” mark
(4) piston
(5)
(3)
(3)
(5)
(4)
(3)
(3)
(2)
(2)
(6)
Piston Installation
(1) shop towels
(2) connecting rod small end
(2)
(1)
CRF450R.book Page 85 Thursday, July 8, 2010 9:34 AM