Briggs & Stratton 273521, 271172, 270962, CE8069, 276535 manual Adjust Valve Clearance

2.Move equipment speed control to idle position.

3.Turn idle screw to obtain 1750 RPM minimum.

4.Then turn idle mixture screw clockwise slowly until engine begins to slow.

5.Then turn screw opposite direction until engine just begins to slow.

6.Then turn screw back to midpoint (Figure 39).

Figure 39

7.Install limiter cap (if equipped) on idle mixture screw (Figure 40).

Figure 40

8.Move equipment speed control from idle to high speed position.

9.Engine should accelerate smoothly. If it doesn’t, open idle mixture screw 1/8 turn open.

Adjust Valve Clearance

All Models - Except Vertical Models 110000, 120000 Early Production

NOTE: Check valve clearance while the engine is cold.

1. Turn crankshaft counterclockwise until

piston is at top dead center on the1 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 41), adjust rocker nut to obtain the clearance as listed in Section 12 - Engine Specifications.

4.Hold rocker nut and tighten the rocker ball setscrew (B) to the torque valve shown in Section 12 - Engine 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 41

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