Honda 2005 CRF450R Owner's Manual page 75

Piston/Piston Rings/Piston Pin
5. Apply engine oil to the cylinder wall, piston
outer surface and piston rings.
Route the cam chain (4) through the cylinder
(5).
Install the cylinder over the piston rings by
hand while compressing the piston rings (6).
NOTICE
Do not damage the piston rings and cylinder
walls.
(5)
(6)
(4) cam chain (6) piston rings
(5) cylinder
70
Servicing Your Honda
6. Install the cam chain guide (7) and fit the cam
chain guide tabs (8) in the cylinder cut-outs
(9).
Push the guide until it bottoms in the
crankcase guide hole.
(4)
(7) cam chain guide
(8) cam chain guide tabs
(9) cylinder cut-outs
(7)
(8)
(9)
Cylinder Head Installation
1. Install the dowel pins (1) and a new cylinder
head gasket (2).
NOTICE
Do not let the dowel pins fall into the crankcase.
(2)
(1)
(1) dowel pins
(2) cylinder head gasket