2006-2010 Suzuki DF150 / DF175 4-Stroke Outboards Service Manual, Page 258Get this manual
POWER UNIT
$ 09900-20101: Vernier calipers Valve seat contact width Standard: IN& EX1.1 1.3 mm (0.0433 0.0512 in) If measurement exceeds specification, repair valve seatNOTE: For valve seat repair, see "Valve seat servicing" section on page 6-70VALVE SEAT SERVICING If valve seat contact width is out of specification, reface valve seat as follows: Valve seat angle Intake side15, 45, 60 Exhaust side15, 45, 60: Valve seat cutter (NEWAY128) 45Valve seat cutter (NEWAY212) 15 09916-22420: Valve seat cutter (NEWAY114) 60 Solid pilot (NEWAY, N-150-5.5) 09916-24450: Solid pilot (NEWAYN-100-5.52) 09916-54910: Handle (N-505)