19Replacing the sprocketCAUTION:Protective gloves must be put on.Check the sprocket before mounting a new chain (A).Worn out sprockets (more than 0,2 mm) (B) may damage thenew chain and must therefore be replaced.- Loosen the fastening nuts (C/1).- Pull off the sprocket guard (C/2).- Take off the sprocket (F/5) from the clutch drum.- Position the new, slightly oiled sprocket and remount allparts in the reverse order.Checking the sprocket- Use the universal wrench to remove the locking washer(D/3).CAUTION:The locking washer might jump out on removing.- Remove the thrust washer (D/4) underneath it.The spark arrester screen should be checked and cleanedregulary.- Remove the screw (F/6), deflector plate (F/7) and arresterscreen (F/8).Caution: Do not use sharp or pointed objects for screen cleaning.Damaged or misformed screen wires may result.Replacing/cleaning thespark arrester screen Checking the muffler screws- Regularly check the three fastening screws (G/9) fortightness.A BD E4 53F86 7C21G9