Honda CRF450R Owner's Manual page 90

Cylinder Head Installation
1. Clean any gasket material off cylinder head.
2. Install the cam chain guide (1) and fit the cam
chain guide tabs (2) in the cylinder cutouts (3).
Push the guide until it bottoms in the crankcase
guide groove.
(1) (2)
(3)
(1) cam chain guide (3) cylinder cutouts
(2) cam chain guide tabs
3. Install the dowel pins (4) and a new cylinder
head gasket (5).
NOTICE
Do not let the dowel pins fall into the crankcase.
(4)
(5)
(4) dowel pins
(5) cylinder head gasket (new)
4. Route the cam chain through the cylinder head
and install the cylinder head (6).
NOTICE
Do not damage mating surfaces when installing
the cylinder head.
5. Apply engine oil to all cylinder head bolt
threads and seating surface.
Install the washers and cylinder head bolts (7)
and tighten them to the specified torque in a
crisscross pattern in two or three steps:
38 lbf·ft (51 N·m, 5.2 kgf·m)
NOTICE
Do not let the washers fall into the crankcase.
Piston/Piston Rings/Piston Pin
6. Install the cylinder bolt (8) and tighten it to the
specified torque:
7 lbf·ft (10 N·m, 1.0 kgf·m)
(8)
(6)
(6) cylinder head
(7) washers and cylinder head bolts
(8) cylinder bolt
Servicing Your Honda
(7)
(cont'd)
83