Change Engine Oil

Maintenance

(ECXHNBBC21 and ECXHN21 Units). (May need more often if they are damaged or excessively dirty.)

Note: Do Not operate the engine without the air cleaner assembly; extreme engine damage will occur.

1.Stop the engine and wait for all moving parts to stop.

2.Disconnect the wire from the spark plug (Figure 9).

3.Remove the two wing nuts that secure the cover (Figure 27).

psi (207 kPa) through the filter from the wire screen side to remove any excess dirt. If the paper element is excessively dirty, replace it.

Note: Never try to brush dirt off the paper element; brushing forces the dirt into the fibers.

9.Clean the foam element in warm, soapy water or in a nonflammable solvent.

10.Rinse and dry the foam element thoroughly.

11.Dip the foam element in clean engine oil, then squeeze out the excess oil.

Note: Excess oil in the foam element restricts the air flow through the element and may reach the paper filter and clog it.

12.Wipe dirt from the base and the cover with a moist rag.

Note: Be careful to prevent dirt and debris from entering the air duct leading to the carburetor.

13.Install the air cleaner elements and ensure that they are properly positioned.

14.Securely install the cover with the two wing nuts.

Figure 27

1.	Wing nuts	4.	Foam element
2.	Cover	5.	Base

3.Paper element

4.Remove the cover.

Note: Be careful to prevent dirt and debris from falling into the base.

5.Remove the foam and paper elements from the base.

6.Remove the foam element from the paper element.

7.Inspect the foam and paper elements, and replace them if they are damaged or excessively dirty.

8.Tap the paper element on a hard surface several times or use compressed air not exceeding 30

Service Interval: After the first 5 hours

Every 50 hours (May need more often under severe conditions.)

1.Run the engine to warm the engine oil.

Note: Warm oil flows better and carries more contaminates.

WARNING

Oil may be hot after engine has been run. Contact with hot oil can cause severe personal injury.

Avoid contacting the hot engine oil when you drain it.

2.Stop engine, wait for all moving parts to stop.

3.Disconnect the wire from the spark plug.

4.Drain the gasoline from the fuel tank. Refer to

Emptying the Fuel Tank and Cleaning the Fuel Filter section.

COMMERCIAL 21 specifications

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