Honda CRF250R 2018 Owner's Manual page 78

Camshaft Installation
1. Lift the rocker arms (1) up and install the
newly selected valve shims (2) on the valve
spring retainers (3).
NOTICE
Do not let the valve shims fall into the crankcase.
(1)
(3)
(2)
(1)
(1) rocker arms (3) valve spring retainers
(2) valve shims
2. Check the operation of the plunger (4) by
moving the decompressor weight (5) of the
exhaust camshaft (6) with your finger. The
plunger should be retracted and protruded
smoothly.
(5)
(4)
(4) plunger (6) exhaust camshaft
(5) decompressor weight
If the operation is not smooth, refer to an official
Honda Service Manual (page 166) for
decompressor disassembly or see your dealer.
3. Make sure the piston is at TDC on the
compression stroke (page 69).
4. Apply molybdenum disulfide oil (a mixture of
1/2 engine oil and 1/2 molybdenum disulfide
grease containing more than 3% molybdenum
disulfide additive Moly Paste 77) to the
(3) (1)
following parts.
– camshaft cam lobes (7)
– journal surfaces (8)
– decompressor weight (5)
(2) – plunger (4)
(4)
(8)
(3) (1)
(7)
(4) plunger
(5) decompressor weight
(7) camshaft cam lobes
(8) journal surfaces
(6)
(7)
(8)
(8) (5)
Valve Clearance
5. Remove the sealing bolt (9) and sealing washer
(10).
(10)
(9) sealing bolt
(10) sealing washer
6. Insert the rocker arm shaft stopper bolt (11)
aligning the cut-out of the rocker arm shaft
(12) with the rocker arm shaft stopper bolt by
rotating a suitable 4 mm bolt (13).
NOTICE
Do not let the rocker arm shaft stopper bolt fall
into the crankcase.
(12)
(11) rocker arm shaft stopper bolt
(12) rocker arm shaft
(13) 4 mm bolt
Servicing Your Honda
(9)
(11)
(13)
(cont'd)
73