Honda CRF250R 2005 Owner's Manual page 71

Piston Installation
1. Place clean shop towels in the crankcase 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.
3. Install the piston (1) with the "IN" mark (2)
and/or the large valve recesses (3) facing the
intake side of the engine.
4. Apply flesh engine oil to the piston pin (4).
Install the piston pin and new piston pin clips
(5).
NOTICE
Use new pin clips. Never reuse old clips.
Do not let the clips fall into the crankcase.
Do not align the piston pin clip end gap with the
piston cut-out.
(1)
(3)
(1)
(4)
(6)
(1) piston (4) piston pin
(2) "IN" mark (5) piston pin clip
(3) large valve recesses (6) cut-out
Piston/Piston Rings/Piston Pin
(2)
Cylinder Installation
1. Clean off any gasket material from the gasket
surface of the crankcase, being careful not to
let any material fall into the crankcase.
Be careful not to remove any metal from the
gasket surface.
2. Remove the shop towel. Do not let any gasket
debris fall into the crankcase.
3. Install the dowel pins (1) and cylinder gasket
(2).
(2)
NOTICE
Do not let the dowel pins fall into the crankcase.
(5)
(5) (1) dowel pins
(2) cylinder gasket
4. Clean the any gasket material off the cylinder.
(1)
(2)
(cont'd)
67
Servicing Your Honda