37
Cylinder Head and Valves
Before the cylinder head can be removed, other external parts
must be removed, such as the air cleaner, fuel tank, oil fi ll
tube, blower housing, muffl er, carburetor, control bracket
assembly, and intake manifold.
1. Remove four screws from rocker cover, then remove
cover and gasket (A, Figure 44).
Remove Cylinder Head
Figure 44
2. Remove cylinder head screws, then remove head and
gasket from cylinder.
3. Remove push rods one at a time, marking the location
and orientation of each for proper installation later.
NOTE: On model 210000 the intake push rod (lower, alumi-
num) is hollow and the exhaust push rod (upper, steel) has a
red band of paint for identifi cation.
4. Using a plastic scraping tool, carefully clean all traces
of head gasket from the head and cylinder mating
surfaces.
Disassemble Cylinder Head
1. Loosen rocker arm screws and/or lock nuts, and
remove from rocker arm studs. Remove rocker arms
and rocker balls from studs (A, Figure 45).
Figure 45
2. Remove the rocker arm studs.
3. Using thumbs, press down on each valve spring
retainer and disengage retainer (A, Figure 46) from
valve stem (B). Remove retainers, springs, valves, and
intake valve stem seal/washer, if equipped.
Figure 46
4. Remove push rod cylinder head plate and plate gasket.
Remove and discard the plastic push rod guides from
the head plate.
Inspection
1. Visually inspect head for cracks, excessive heat
discoloration, warping of the cylinder or rocker cover
mating surfaces, and burned or damaged valve seats.
Replace head, if any of these problems are found.
2. If head passes visual inspection, use Plug Gauge
#19122 to check valve guides for wear. If gauge
enters the guide 1/4” (6.4 mm) or more, replace the
entire head. If plug gauge is not available, see Engine
Specifications for the valve guide reject dimension.
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