How to Troubleshoot a Briggs & Stratton Model 402417 Twin Cylinder

Check the Briggs & Stratton model 402417 twin cylinder's spark plug. It should be connected to the thin, black ignition wire on the right side of the Briggs & Stratton engine assembly. If it is not, reinsert the wire into the rear of the spark plug.

Replace the Briggs & Stratton model 402417 twin cylinder's spark plug if it appears worn, if it features corrosion or if its white ring has become blackened with spots. Remove the ignition wire and connect the wire into the rear insertion point on a new spark plug.

Ensure the Briggs & Stratton model 402417 twin cylinder's solenoid is properly connected. Find the solenoid by tracing the red terminal wire on the battery back to where the solenoid lies between the battery and the rest of the engine. This wire must be connected to the Briggs & Stratton model 402417 twin cylinder solenoid's side bolt. Place the terminal wire's end over the bolt and tighten it into place using a socket wrench.

Troubleshoot the Briggs & Stratton model 402417 twin cylinder's carburetor if engine problems persist and it is running roughly. Turn on the engine and leave it on.

Find the Briggs & Stratton model 402417 twin cylinder's bowl-shaped carburetor on the right side of the twin cylinder engine, about halfway down from the engine's top. The bottom of the carburetor features an air adjustment needle valve. Tighten this air adjustment valve to the right until you can't tighten it any more.

Rotate the adjustment valve back to the left one or two rotations and listen to the engine as you do so. Adjust the valve gradually to the left if the engine continues to sputter and run roughly. Listen as you make adjustments.

Operate on the Briggs & Stratton model 402417 twin cylinder's's carburetor if the air adjustment valve alterations are not providing the desired results. Place a pan below the carburetor before proceeding.

Unscrew the nut on the twin cylinder carburetor's underside using a socket wrench. Allow any gas and liquid to drain out into the pan, then remove the loosened carburetor bowl entirely.

Use a wire brush to scrub the nut clean with a carburetor cleaning solution.

Scrub the inside of the twin cylinder carburetor's bowl using a cloth. Ensure it is clean, then set it back into place.

Tighten the nut into the carburetor's bottom with your socket wrench.