Cylinder head
99
6. Inspect the valve stem. See Figure 9.15.
7. Inspect the valve springs.
NOTE: Valve spring free length should be at least
1.22” (28.5mm). Original length is 1.44”
(36.6mm).
8. Install the valves in the cylinder head by following
steps 2 - 5 in reverse order.
9. Test the valves for leaks by:
9a. Place the cylinder head on a couple of wood
blocks with the valves facing up.
9b. Pour a small amount of gasoline or parts clean-
ing solvent into the combustion chamber (just
enough to cover the valves).
9c. Let the cylinder head sit for ten minutes.
9d. Check for gasoline leaking out of the intake and exhaust ports.
10. Install the cylinder head by following the steps described earlier in this chapter.
11. Set the valve lash by following the steps described in Chapter 1: Introduction.
12. Test run the mower in a safe area before returning it to service. Check all safety features.
Figure 9.15
45
o
Inspect for a
burnt edge
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