Honda crf250r 2012, Owner'S Manual, Page: 89 / 177

Piston/Piston Rings/Piston Pin
82
Servicing Your Honda
6. 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).
Do not damage the piston rings and cylinder
walls.
NOTICE
(3) cam chain (5) piston rings
(4) cylinder
7. 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.
(6) cam chain guide
(7) cam chain guide tabs
(8) cylinder cut-outs
Cylinder Head Installation
1. Install the dowel pins (1) and a new cylinder
head gasket (2).
Do not let the dowel pins fall into the crankcase.
NOTICE
(1) dowel pins
(2) cylinder head gasket
(5)
(4)
(3)
(7)
(6)
(8)
(2)
(1)