Remove air cleaner with engine at operating temp, ignition off, spray foam onto carburetor throat. Allow to stand 5-10min. Start motor, run engine fast enough to prevent stalling while spraying same volume foam into carburetor throat. Stop engine, allow to stand for 5-10min. Restart engine, blow out deposits from engine. Adjust settings or air bleed and idle screw. For fuel injection engines, spray compression stabilizer directly onto induction manifold through a vacuum pipe nearest center of the manifold. Run engine at high RPM to prevent stalling.