Specification & Technical Data. M40 x 1.0. Model and Part Number Compatibility. Yamaha XT 660 X 2004 Yamaha XT 660 X 2005 Yamaha XT 660 X 2005 Yamaha XT 660 X 2006 Yamaha XT 660 X 2006 Yamaha XT 660 X 2007 Yamaha XT 660 X 2007 Yamaha XT 660 X 2008 Yamaha XT 660 X 2008 Yamaha XT 660 X 2009 Yamaha XT 660 X 2010 Yamaha XT 660 X 2011 Yamaha XT 660 X 2012 Yamaha XT 660 X 2013 Yamaha XT 660 X 2014 Yamaha XT 660 X 2015 Yamaha XT 660 X 2016 Ref:773.15.34.