The Acerbis Chain Guide Block easily replaces the entire OEM unit and ensures durability and high resistance to shock and wear from the chain. Made of PA6, it is made of two parts that allow installation without removing the chain. 100% PA6 construction Highly resistant to shock and chain wear Made of 2 pieces, allowing to be mounted without removing the chain In the event of collision or contact with roost, material won't bend Weight: 200 grams Kawasaki KX450 E9F EFI 2009 Kawasaki KX450 EAF EFI 2010 Kawasaki KX450 EBF EFI 2011 Kawasaki KX450 FDF EFI 2013 Kawasaki KX450 FEF EFI 2014 Kawasaki KX450-F 2021 Kawasaki KX450-F 2020 Kawasaki KX450-F 2019 Kawasaki KX450-F 2018 Kawasaki KX450-F 2017 Kawasaki KX450-F 2012 Kawasaki KX450FFF EFI 49mm Forks 2015 Kawasaki KX450HGF EFI 49mm Forks 2016 Kawasaki KX250-F 2021 Kawasaki KX250-F 2020 Kawasaki KX250-F 2019 Kawasaki KX250-F AHF 2017 Kawasaki KX250-F AJF 2018 Kawasaki KX250-F W9F 2009 Kawasaki KX250-F XAF 2010 Kawasaki KX250-F YBF 2011 Kawasaki KX250-F YCF 2012 Kawasaki KX250-F ZDF 2013 Kawasaki KX250-F ZEF 2014 Kawasaki KX250-F ZFF 2015 Kawasaki KX250-F ZGF 2016 Fits: Kawasaki KX450F 2023