Honda CRF250X Owner's Manual & Competition Handbook page 77

250X_060-083.qxd 08.7.3 10:11 ページ71
Camshaft Installation
1. Install the newly selected shims (1) on the
valve retainers (2).
NOTICE
Do not let the shims fall into the crankcase.
(1)
(2)
(1) shims (2) valve retainers
2. Apply molybdenum disulfide oil solution (a
mixture of 1/2 engine oil and 1/2
molybdenum disulfide grease containing more
than 3% molybdenum disulfide
additive) to outer surface of the each valve
lifters.
Install the valve lifters (3).
(3) valve lifters
3. Rotate the primary drive gear bolt (4)
(crankshaft) clockwise and align the punch
mark (5) with the " " mark (6).
(4)
(2)
(4) primary drive gear bolt
(5) punch mark
(6) " " mark
4. Apply molybdenum oil solution to the
camshaft journals and cam lobes.
Place the camshaft (7) with the intake cam
lobes (8) facing up and align the timing marks
(9) on the cam sprocket (10) with the top
surface of the cylinder head (11).
Install the cam chain (12) over the sprocket
without rotating the camshaft.
(7)
(9)
(3)
(7) camshaft
(8) intake cam lobes
(9) timing marks
5. Apply grease to the set rings and install it
onto the camshaft holders (13).
Apply oil to the camshaft holder bolt threads
and seating surface.
Install the camshaft holder bolts (14) and
(6)
tighten it to the specified to torque:
16 N·m (1.6 kgf·m, 12 lbf·ft)
Tighten the camshaft holder bolts in a criss-cross
pattern in two or three steps.
(5)
(14)
(13) camshaft holders
(12)
(8)
(10)
(9)
(11)
(10) cam sprocket
(11) cylinder head
(12) cam chain
Valve Clearance
(13)
(14)
(14) camshaft holder bolts
(cont'd)
71
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