3. INSPECTION/ADJUSTMENT MXU 500 IRS 3. Use a brush to remove carbon deposits from the spark arrester screen. Be careful to avoid damaging the spark arrester screen. The spark arrester must be free of breaks and holes. Replace, if necessary. Check the gasket. Replace, if necessary. 4. Install the spark arrester and the gasket in the muffler and tighten the three bolts securely. DRIVE SHAFT BOOTS Check the protective boots for holes or tears. If any damage is found, have them replaced. 3-20