61/65/70/75 Series Horizontal Shaft Engines
98
3. Lift the springs off of the valve stems.
4. Slide the valves out of the cylinder head.
NOTE: Only the intake valve has a valve guide seal.
See Figure 9.13.
5. Inspect the valve seat. See Figure 9.14.
• Valve seats are 45 degrees, with a 15 degree top-
ping cut and a 75 degree narrowing cut.
• Seat width should be 0.043” - 0.050” (1.1-1.3mm)
with a margin of 0.024” (0.6mm) on the exhaust
valve and 0.027” (0.7mm) on the intake valve.
NOTE: The valve seat can be ground to clean it up
as long as the finished seat is within the tol-
erances listed above.
Figure 9.14
Seat angle is 45
o
0.043-0.050”
Margin
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