Honda CRF250R 2005 Owner's Manual page 72

Piston/Piston Rings/Piston Pin
5. Apply clean engine oil to the cylinder wall,
piston outer surface and piston rings.
Route the cam chain (3) through the cylinder
(4).
Install the cylinder over the piston rings by
hand while compressing the piston rings (5).
NOTICE
Do not damage the piston rings and cylinder
walls.
(5)
(3) cam chain (4) cylinder
(5) piston rings
68
Servicing Your Honda
6. Install the cam chain guide (6) and fit the cam
chain guide tabs (7) in the cylinder cut-outs
(8).
Push the guide until it bottoms in the
crankcase guide hole.
(7)
(3)
(8)
(6) cam chain guide
(7) cam chain guide tabs
(8) cylinder cut-outs
(4)
Cylinder Head Installation
1. Install the dowel pins (1) and new cylinder
head gasket (2).
NOTICE
(6)
Do not let the dowel pins fall into the crankcase.
(1)
(1) dowel pins
(2) cylinder head gasket
(2)