Features: 1.Precision CNC machined aluminum screw, beautiful and lightweight 2.Anodized finishing treatment for rust-proof and high durability 3.With an o-ring design to resist engine vibration and increase accuracy and longevity 4.Numerically calibrated for tuning memory, adjust air fuel mixture with this screw easily 5.Fit for Keihin FCR & FCR-MX Carburetors, fits most common 4-stroke models Specification: Features:_x000D_ _x000D_ Precision CNC machined aluminum screw, beautiful and lightweight. _x000D_ Anodized finishing treatment for rust-proof and high durability. _x000D_ With an o-ring design to resist engine vibration and increase accuracy and longevity. _x000D_ Numerically calibrated for tuning memory, adjust air fuel mixture with this screw easily. _x000D_ Comes with spring, washer and O-ring, it is easy to install and replace. _x000D_ Fit for Keihin FCR & FCR-MX Carburetors, fits most common 4-stroke models. _x000D_ _x000D_ Specifications:_x000D_ Material: CNC Aluminum_x000D_ Color: Red_x000D_ Size: 57 * 13mm/2.2 * 0.5in (Manual measurement, please allow a slight dimension variation)_x000D_ Package Weight: approx.3g_x000D_ Fitment:_x000D_ Fits for Keihin FCR & FCR-MX Carburetors, fits most common 4-stroke models. Reference fit models as following._x000D_ for CRF150R 2007-2009, 2012-2016_x000D_ for CRF150R Expert 2007-2009, 2012, 2015-2016_x000D_ for CRF250R 2004-2009_x000D_ for CRF250X 2004-2009, 2012-2013, 2015_x000D_ for CRF450R 2002-2008_x000D_ for CRF450X 2005-2009, 2012-2015_x000D_ for TRX450R 2006-2009, 2012-2013_x000D_ for TRX450R (Electric Start) 2009, 2014_x000D_ for KLX450R 2008-2009_x000D_ for KX250F 2004-2010_x000D_ for KX450F 2006-2009_x000D_ for 250 SX-F 2005-2011_x000D_ for 250 XC-F 2008-2009_x000D_ for 250 XCF-W 2007-2010, 2012-2014_x000D_ for 400 XC-W 2009-2010_x000D_ for 450 EXC 2003-2011_x000D_ for 450 MXC 2003-2005_x000D_ for 450 SX 2003-2006_x000D_ for 450 SX-F 2008-2012_x000D_ for 450 XC 2007_x000D_ for 450 XC-F 2008-2009_x000D_ for 450 XC-W 2012_x000D_ for 450 XC 2008-2009_x000D_ for 505 SX-F 2007-2008_x000D_ for 505 XC-F 2008_x000D_ for 525 EXC 2003-2007_x000D_ for 525 MXC 2003-2005_x000D_ for 525 SX 2003-2006_x000D_ for 525 XC 2006-2007_x000D_ for 525 XC 2008-2009_x000D_ for 530 EXC 2009-2011_x000D_ for RM-Z250 2004-2009_x000D_ for RM-Z450 2005-2008_x000D_ for WR250F 2001-2009, 2011-2013_x000D_ for WR426F 2001-2002_x000D_ for WR450F 2003-2009, 2011_x000D_ for YFZ450 2004-2009, 2013_x000D_ for YZ250F 2001-2013_x000D_ for YZ426F 2000-2002_x000D_ _x000D_ Package List:_x000D_ 1 x Mixture Screw_x000D_ 2 x O-ring_x000D_ _x000D_ 1 x Spring PackageList: