Replacing the Spark Plug, Exhaust Exit Tube Removal

MAINTENANCE AND REPAIR INSTRUCTIONS (Continued)

NOTE: If the carburetor adjustments do not help the unit to run properly, contact your authorized service dealer.

Fig. 32

REPLACING THE SPARK PLUG

Use a Champion RDJ7Y spark plug (or equivalent). Correct air gap is .025 in (0.635 mm). Remove plug after every 50 hours of operation and check its condition.

1.Stop the engine and pull the wire off of the spark plug.

2.Clean around the spark plug and remove it from the cylinder head.

NOTE: Replace a cracked, fouled or dirty spark plug. Do not sand blast, scrape or clean electrodes because the engine could be damaged by grit entering thecylinder.

3.Set the air gap at .025 in (0.635 mm) using a wire feeler gauge (Fig. 33). Install a correctly gapped spark plug into the cylinder head. Torque to 110-120 in•lb (12.3-13.5 N•m).

.025 in

(0.635 mm)

Fig. 33

INSPECTING/CLEANING THE MUFFLER

The muffler should be removed every 25 hours of opera- tion to inspect for excessive carbon build-up. Excessive deposits around the exhaust ports or exhaust holes will cause poor engine performance.

Use the following procedure to remove, inspect and clean and reinstall the muffler.

WARNING

Make sure the muffler is cool before inspecting and cleaning it.

1.Remove the muffler mounting bolts (Fig. 34).

2.Remove the muffler (with heat shield) and gasket. Discard the old gasket.

Muffler Mounting Bolts

Fig. 34

Exhaust Exit Tube Removal

The exhaust exit tube is removable on blower and blower/vac mufflers. To remove the exhaust exit tube:

1.Remove the screws securing the exhaust exit tube to the muffler body (Fig. 35).

2.Remove the exhaust exit tube and gasket.