Camshaft Installation - Honda CRF450R Manual Del Propietario Y Guía De Competiciones

Camshaft Installation

1. Install the newly selected shims (1) on the
valve spring retainers (2).
NOTICE
Do not let the shims fall into the crankcase.
(1)
(2)
(1) shims
(2) valve spring retainers
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 following parts.
– camshaft cam lobes
– each valve lifter outer surface
– plunger whole surface
3. Install each valve lifter (3) in their original
location into the cylinder head (4).
(3)
(2)
(3) valve lifters
(4) cylinder head
4. Check the operation of the plunger (5) by
turning the decompressor weight (6) with your
finger; The plunger should be retracted and
(1)
protruded smoothly.
(5)
(5) plunger
(6) decompressor weight
If the operation is not smooth, refer to an official
Honda Shop Manual for decompressor
disassembly or see your Honda dealer.
5. Make sure the piston is at TDC on the
6. Install the camshaft (7) onto the cylinder head
(4)
(7) camshaft
7. Install the cam chain (9) over the cam sprocket
(6)
(4) cylinder head
(7) camshaft
(9) cam chain
Valve Clearance
compression stroke (page 72).
with intake cam lobes (8) facing up as
illustrated below.
(7)
(8) intake cam lobes
(10).
While holding the left camshaft bearing (11) to
the left fully, install the camshaft (7) onto the
cylinder head (4).
(7)
(11)
(10)
(9)
(10) cam sprocket
(11) left camshaft bearing
Servicing Your Honda
(8)
(4)
(cont'd)
77