Spray can should be at room temperature (about 72F/22C). For pinpoint application or to get into hard-to-reach areas, firmly insert extension tube into hole in spray button. Hold can upright while spraying. Remove carburetor air box cover or air box to expose carburetor throat. If marine engine is not in water, connect external water supply to provide engine cooling. Outboards: Start engine and with shift lever in neutral, maintain a fast idle speed (approximately 2500 RPM) by using the warm up lever. Other Applications: Start engine and amintain a fast idle speed. Spray Fogging Oil into carburetor(s) continuoulsy switching between the carburetor throats for the indicated times (approximately one minute per cylinder) Shut down engine immediately upon completion of spraying. Other Equipment Internal Parts: Spray into carburetor at a rate of one minute per cylinder and shut down immediately upon completion of spraying.