Honda CRF450X 2017 Owner's Manual & Competition Handbook page 78

11. Check the operation of the plunger (3) by
pushing the decompressor weight (20) with
your finger and then pushing the plunger
down. Release the decompressor weight and
pull up the plunger.
(20)
(3) plunger
(20) decompressor weight
12. Remove the tensioner stopper (26) from the
cam chain tensioner lifter.
(26) tensioner stopper
17 CRF450X̲31MEY710.indb 73 17 CRF450X̲31MEY710.indb 73
13. Rotate the primary drive gear bolt
(crankshaft) clockwise two turns and align
the punch mark (13) with the index mark
(14). Make sure that the timing mark (17)
on the sprocket align with the " " mark
(18) on the camshaft holder assembly. If the
timing mark doesn't align with the " " mark,
remove the cam sprocket.
Then realign the valve timing.
(13)
(3)
(13) punch mark
(14) index mark
(17) timing mark
(18) " " mark
(26)
(17)
(14)
(18)
Valve Clearance
14. Measure the intake valve and exhaust valve
clearances by inserting a feeler gauge (27).
Valve Clearance:
IN: 0.006 ± 0.001 in (0.16 ± 0.03 mm)
EX: 0.011 ± 0.001 in (0.28 ± 0.03 mm)
(27)
(27)
(27) feeler gauge
15. Install a new sealing washer (28) and tighten
the cam chain tensioner lifter cover bolt (29).
(29)
(28)
(28) sealing washer
(29) cam chain tensioner lifter cover bolt
Servicing Your Honda
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