7
TUNE-UP PROCEDURE
The following is a minor tune-up procedure. If the engine does not perform properly after the tune-up is completed,
consult the "Troubleshooting Engine Operation Chart" found in Chapter 7. Repair procedures are listed in each chapter.
Remove the spark plug wire before doing any service work on the engine.
1. Service or replace the air cleaner as necessary. Use the applicable procedure found in Chapter 2 under
"Service".
2. Remove the fuel from the fuel tank by running the engine until stopping or draining into an approved fuel
container.
3. Remove the fuel tank and blower housing to clean all debris from the air intake screen, cylinder cooling fins,
governor and carburetor linkage.
4. Replace the blower housing and check all remote linkage for proper adjustment and operation.
5. Check to see that the engine is properly secured to the equipment. On rotary lawnmowers, balance the blade
and check the blade hub and crankshaft key for wear. Replace as necessary. Torque the bolts to the correct
specification.
6. Replace the spark plug with the correct replacement by using the Master Parts Manual. Set the spark plug gap
at .030" (.762 mm) and install it in the engine. Tighten the spark plug to 230 inch pounds (2.6 Nm) of torque. If
a torque wrench isn't available, screw the spark plug in as far as possible by hand. Use a spark plug socket or
wrench to turn the spark plug 1/8 to 1/4 turn further if using the old spark plug, or 1/2 turn further if a new spark
plug is used. Reinstall the spark plug wire.
7. Fill the fuel tank with the proper fuel/oil mix.
8. Start the engine and allow it run 3 - 5 minutes to reach operating temperature. Adjust the carburetor if necessary
(see Chapter 3 under "Service" for the final idle mixture adjustment procedure) and set the engine R.P.M.(s)
according to the specification number found on microfiche card # 30 or computer parts lookup system.
!
CAUTION
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