78/83/90 Series Horizontal Shaft Engines
98
8. Remove the screw that fastens the throttle lever to
the rear of the cylinder head using a 10 mm wrench.
See Figure 9.3.
NOTE: The throttle lever can be disconnected and
removed from the engine or moved to the
side.
9. Remove the five screws securing the valve cover
using a 10mm wrench. See Figure 9.4.
10. Loosen the jam nuts and fulcrum nuts that secure
the rocker arms using a 10mm wrench and a 14mm
wrench.
11. Pivot the rocker arms aside, or remove them com-
pletely, and remove the push rods.
NOTE: Once broken-in, the rocker arm should be
kept with its corresponding valve.
NOTE: The intake and exhaust push rods are iden-
tical and interchangeable. It is preferable,
but not absolutely necessary, to return the
same push rods to their original locations on
engine with substantial (
>100 hours) operat-
ing time.
12. If replacing the head, double-nut and remove the
exhaust and carburetor studs.
13. Remove the cylinder head bolts using a 12mm
wrench.
See Figure 9.5.
Figure 9.3
Remove this
screw
Figure 9.4
Remove valve cover
Figure 9.5
Cylinder head
bolts
1
2
3
4
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