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2. Place the stop switch in the "OFF" position. 3. Remove accumulation of grease, oil, dirt and debris from exterior of unit. 4. Perform all periodic lubrication and services that arerequired. 5. Tighten all the screws and nuts. 6. Drain fuel tank completely. Press purge bulb 6 -7 times to remove remaining fuel from carburetor then drain the tank again. Close choke, start and run the engine until it stops due to lack of fuel. 7. A. Allow engine to cool then remove the spark plug and pour7 cc(1/4