You purchase a Briggs & Stratton repair manual, and go from there.
Remove the valve covers and using the appropriate feeler guage rotate the crank until each valve is in the fully closed position and slide the feeler between the rocker arm and the valve stem. Adjust until the feeler fits snugly but can still slide in and out by loosening the jam nut on the rocker and turning the adjusting nut. You need to hold the adjusting nut still while you tighten the jam nut.
.002-.005 intake and, .005-.007 exhaust
.006 intake and.008 exhaust
You adjust the tappet. That's the thingy that pushes the valve down.
The valve clearance for a Briggs and Stratton 342cc engine is typically set at 0.003 to 0.005 inches (0.08 to 0.13 mm) for both the intake and exhaust valves. It's important to check the specific model's manual, as valve clearance specifications can vary slightly. Proper clearance ensures optimal engine performance and prevents valve damage. Always adjust the clearance when the engine is cold for accurate measurements.
To check the valve clearance on a Briggs & Stratton Raptor engine, first, ensure the engine is cool and remove the spark plug for safety. Rotate the engine to the top dead center (TDC) of the compression stroke for the cylinder you are checking. Use a feeler gauge to measure the clearance between the rocker arm and the valve stem; the specified clearance can typically be found in the engine's service manual. Adjust the clearance as necessary by loosening the lock nut and turning the adjustment screw, then recheck with the feeler gauge.
.004-.006
You can check the valve clearance with a valve clearance guide. Slide the guide between the valve. The guide will register the clearance.
005 in 007 ex
For the aluminum the intake valve clearance is .005 to .007 inches. exhaust valve clearance is .007 to .009 inches. Cast iron is - intake valve is .007 to .009. inches exhaust valve is .017 to .019 inches
.003 exhaust-.005 intake
0.004 - 0.006"
The valve clearance on a Briggs and Stratton 21 HP OHV engine is typically set to 0.005 inches for both the intake and exhaust valves when the engine is cold. It's important to check the specific model's service manual for any variations or specific adjustments. Proper valve clearance ensures optimal engine performance and longevity.