Yamaha Kit W/ Housing 4 Stroke for Outboards 4-50HP HP Year Kit w/ Housing Letter F4 1999-2001 – – F4 2002-2011 – – F6 2001-2008 18-3410 A F6 2009-2011 – – F8 2001-2011 18-3410 A T8 2001-2010 – – F9.9 1985-2004 18-3411 B F9.9 2005-2006 18-3412 C F9.9 2007-2011 18-3410 A FT9.9 1985-1990 18-3411 B T9.9 1991-1996 18-3411 B T9.9 2005-2006 18-3412 C F15 1998-2005 18-3412 C F15 2006-2011 – – F25 1998-2005 18-3432 D 2009-2011 T25 2001-2006 18-3413 E 2009 F30 2001-2005 18-3413 E F40 1999 18-3415 F F40 2000-2008 18-3413 E F40 2.6L 1999 – – F50 1995-2009 18-3415 F T50 1996 18-3461 G T50 1997-2011 18-3466 H