Yamaha F200B Service Manual

Also see for F200B: Rigging guide Owner's manual Owner's manual

7-65POWR Power unitRefacing the valve seatAfter every lapping procedure, make sureto clean off any remaining lapping com-pound from the cylinder heads and thevalves.1. Reface the valve seat using the specialservice tools.2. Cut the surface of the valve seat using a45° cutter by turning the cutter clockwiseuntil the valve seat face has becomesmooth. NOTICE: Do not over cut thevalve seat. To prevent chatter marks,make sure to turn the cutter evenlyusing a downward force of 40–50 N(4.0–5.0 kgf, 8.8–11.0 lbf).a Slag or rough surface3. Adjust the top edge of the valve seat con-tact width using a 30° cutter.b Previous contact width4. Adjust the bottom edge of the valve seatcontact width using a 60° cutter.Valve seat contact width a:Intake:1.100–1.400 mm (0.0433–0.0551 in)Exhaust:1.400–1.700 mm (0.0551–0.0669 in)Valve seat cutter holder: 90890-06316Valve seat cutter:30° (intake): 90890-0681730° (exhaust): 90890-0632645° (intake): 90890-0681645° (exhaust): 90890-0632560° (intake and exhaust): 90890-0632430 45 6045a30b