28 BRIGGSandSTRATTON.COM
Adjust Valve Clearance
NOTE: Check valve clearance while the engine is cold.
1. Turn crankshaft counterclockwise until piston is at top
dead center on the compression stroke. This prevents
the compression release from holding the valves open.
2. Insert a narrow screwdriver or rod into the spark
plug hole as a gauge, then slowly turn crankshaft
counterclockwise until the piston has moved down the
bore by 1/4” (6mm).
3. Using a feeler gauge (A, Figure 23), adjust rocker nut to
obtain the clearance as listed in Specifications.
4. Hold rocker nut and tighten the rocker ball setscrew (B)
to the torque valve shown in Specifications.
5. Check clearance again and re-adjust, if necessary.
6. Repeat for other valve.
NOTE: On some models, the nut and setscrew are positioned
above the push rod ends.
Figure 23
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