Z Force
29
14.13.Turn the engine off, and confirm correct choke
adjustment. Remove the air filter cover and air
filter to confirm that the choke plate is fully
closed when the choke is applied, and fully open
at the full-throttle position. See Figure 14.13.
14.14.The valve lash should be checked after every
300 hours of use.
14.15.If the Z-Force has been run recently, allow the
engine to cool before adjusting the valves.
14.16.Clean the engine and surrounding area before
beginning the valve lash adjustment.
14.17.Disconnect and ground the spark plug wires.
14.18.Remove the spark plugs using a 3/4” spark plug
socket.
14.19.Remove the valve covers using a 10mm wrench.
See Figure 14.19.
Figure 14.13
Figure 14.19
Valve covers
14.20.Rotate the engine in its normal direction of oper-
ation until the piston in the first cylinder to be
adjusted is at top dead center on the compres-
sion stroke (both valves closed).
14.21.Check the valve lash. Clearance between the
stem of the intake valve and the intake rocker
arm should be .004” - .006” (.10mm - .15mm).
Clearance between the stem of the exhaust
valve and the exhaust rocker arm should also be
be .004” - .006”.
14.22.If necessary, adjust the clearance using a 3mm
allen wrench to loosen the locks crews, and a
14mm wrench to move the adjusting nut.
See Figure 14.22.
14.23.Torque the locks crews to 61 in-lb. (6.9 N-m),
and re-check adjustment.
14.24.When adjustment is complete on the first cylin-
der, turn the crankshaft to bring the second pis-
ton to top dead center on the compression
stroke, and repeat the adjustment procedure on
the second cylinder.
14.25.Install the valve covers using new valve cover
gaskets. Install the screws through the valve
covers before positioning them on each cylinder
head. The gaskets are most easily positioned
on the valve covers rather than the cylinder
head. They will be held in the correct position by
the screws. Sealant should not be necessary.
14.26.Torque the valve covers screws to 17 in-lb. (.20
N-m).
14.27.Check compression for consistency between
cylinders. Optional: check leak-down. If more
than 10% difference is found, cylinder head
reconditioning may be necessary.
Figure 14.22
Locks crews
Adjusting nuts
Check
lash
here
Exhaust
valve
Intake valve
H.T. lead
Spark
plug hole
(168 pages)
(23 pages)
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