Honda CRF450X 2007 Owner's Manual page 84

Piston Installation
1. Place clean shop towels over the crankcase
opening to keep the piston pin clips from
falling into the crankcase.
2. Apply molybdenum disulfide oil solution (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.
3. Apply clean engine oil to the piston pin outer
surface and piston pin hole inner surface.
4. Install the piston (1) with the "IN" mark (2)
and/or the large valve recesses (3) facing the
intake side of the engine.
Install the piston pin (4) and new piston pin
clips (5).
NOTICE
Use new piston pin clips. Never reuse old piston
pin clips.
Do not let the piston pin clips fall into the
crankcase.
Do not align the piston pin clip end gap with the
piston cut-out.
(1)
(1)
(4)
(5)
(1) piston (4) piston pin
(2) "IN" mark (5) piston pin clip
(3) large valve recesses (6) cut-out
Piston/Piston Rings/Piston Pin
(3)
Cylinder Installation
1. Place clean shop towels over the crankcase
opening to prevent dust or dirt from entering
the engine.
2. Clean off any gasket material from the gasket
surface of the crankcase.
3. Remove the shop towel.
4. Install the dowel pins (1) and new cylinder
(2) gasket (2).
NOTICE
(2)
Do not let the dowel pins fall into the crankcase.
(2)
(6)
(1) dowel pins
(2) cylinder gasket
(5)
5. Clean the any gasket material off the cylinder.
(1)
(cont'd)
79
Servicing Your Honda