Honda CRF70F 2004 Owner's Manual page 81

Valve Clearance
LEFT SIDE
(4)
(4) T mark
(5) index mark
3. Rotate the generator flywheel
counterclockwise until the T mark ( ) on the
flywheel lines up with the index mark ( ) on
the crankcase. In this position, the piston
may either be on the compression or exhaust
stroke.
72
Servicing Your Honda
(5)
4
5
The adjustment 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 rocker arms. If they are free, it is 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
flywheel 360° and realign the T mark to the
index mark.