Honda CRF450R 2009 Owner's Manual & Competition Handbook page 71

4. Rotate the crankshaft by turning the primary
drive gear bolt (2) clockwise until the punch
mark (3) on the primary drive gear aligns with
the index mark (4) on the right crankcase cover.
In this position, the piston may either be on the
compression or exhaust stroke.
If the crankshaft passed the punch mark,
rotate the primary drive gear bolt clockwise
again and align the punch mark with the index
mark.
The inspection must be made when the piston
is at the top of the compression stroke when
both the intake and exhaust valves are closed.
This condition can be determined by moving
the exhaust rocker arms (5). If they are free,
an indication that the valves are closed and
that the piston is on the compression stroke. If
they are tight and the valves are open, rotate
the primary drive gear bolt 360° and realign
the punch mark with the index mark.
(3)
(2)
(2) primary drive gear bolt (4) index mark
(3) punch mark
(5)
(5) exhaust rocker arms
(4)
Valve Clearance
Valve Clearance Inspection
1. Set the piston at TDC on the compression
stroke (page 64).
2. Measure the intake valve clearance by
inserting a feeler gauge (1) between the valve
lifters and cam lobes (2).
(2) (1)
(1) feeler gauge
(2) valve lifters and cam lobes
Servicing Your Honda
(1)
(cont'd)
65