Suzuki GSF650S Service Manual page 41

• Loosen the rear axle nut 0 and chain adjusters A to provide
additional chain slack.
• Remove the engine sprocket B.
• Remove the exhaust pipe bolts.
• Loosen the muffler connecting bolt C.
• Remove the muffler mounting bolts D.
• Remove the muffler assembly.
NOTE:
Support the muffler assembly to prevent it from falling.
• Remove the exhaust pipe gaskets E.
ENGINE 3-5