1996-2005 Suzuki DF40, DF50 Four Stroke Outboard Service Manual, Page 177Get this manual
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POWER UNIT 6-34 VALVE SEAT SERVICING If valve seat contact width is out of specification, reface valve seat as follows : Valve seat angle Intake side30, 45 Exhaust side15, 45 09916-20620 09916-20610 0