Race Tech Fork Spring 0.42 kg/mm FRSP 444742 for Kawasaki KX450F, KX250 and Yamaha YZ125

Race Tech Fork Spring 0.42 kg/mm FRSP 444742 for Kawasaki KX450F, KX250 and Yamaha YZ125

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The first step to great handling and predictability is selecting proper spring rates. With over 500 Hi-Performance Springs to choose from, Race Tech is almost guaranteed to have the spring you need. Sportbikes are generally under-sprung for the average rider, causing the bike to be unbalanced and unpredictable.

The Race Tech Fork Spring 0.42 kg/mm, manufacturer part number FRSP 444742 and vendor part number 200-444742, is designed to help improve front-end balance, handling and predictability on compatible motorcycles. Proper fork spring selection is essential for maintaining controlled suspension performance, especially when the original springs are too soft for the rider or riding conditions.

Manufactured by Race Tech from high-quality chrome silicon wire, this fork spring offers a high stiffness-to-mass ratio for responsive suspension action. Each spring is shot-peened and heat treated to support long-term durability and consistent performance. Its accurate spring rate helps reduce suspension inconsistency and resist sacking out during repeated use.

This 0.42 kg/mm fork spring fits the 2007–2012 Kawasaki KX450F, the 2005–2007 Kawasaki KX250 and the 2005 Yamaha YZ125. Confirm motorcycle year, model and suspension requirements before installation. The spring is intended for compatible motorcycle fork applications and should be installed using the manufacturer’s recommended procedures.

Features:

  • Spring Rate: 0.42 kg/mm for controlled and predictable fork performance
  • Material: Chrome silicon wire for strength and durability
  • Construction: High stiffness-to-mass ratio for responsive suspension action
  • Durability: Shot-peened and heat treated to help withstand repeated suspension cycles
  • Consistency: Accurate spring rate designed to resist sacking out
  • Fitment: 2007–2012 Kawasaki KX450F, 2005–2007 Kawasaki KX250 and 2005 Yamaha YZ125
  • Brand: Race Tech
  • Manufacturer Part Number: FRSP 444742
  • Vendor Part Number: 200-444742

Fitment:
2005 Kawasaki KX250
2005 Yamaha YZ125
2005 Yamaha YZ250
2005 Yamaha YZ250F
2005 Yamaha YZ450F
2006 Kawasaki KX250
2007 Kawasaki KX250
2007 Kawasaki KX450F
2008 Kawasaki KX450F
2009 Kawasaki KX450F
2010 Kawasaki KX450F
2010 Yamaha YZ450F
2011 Kawasaki KX450F
2011 Yamaha YZ450F
2012 Kawasaki KX450F
2012 Yamaha YZ450F
2013 Yamaha YZ450F
2014 Beta 450 RR
2014 Beta 498 RR
2015 Yamaha YZ250FX
2016 Yamaha YZ250FX
2016 Yamaha YZ450FX
2017 KTM 150 XC-W
2017 KTM 250 EXC-F
2017 KTM 250 XC-W
2017 Yamaha WR450F
2017 Yamaha YZ250FX
2017 Yamaha YZ450FX
2018 KTM 150 XC-W
2018 KTM 250 EXC-F
2018 KTM 250 XC-W
2018 KTM 250 XC-W TPi
2018 KTM 450 EXC-F
2018 Yamaha WR250F
2018 Yamaha WR450F
2018 Yamaha YZ250FX
2018 Yamaha YZ450FX
2019 KTM 150 XC-W
2019 KTM 250 EXC-F
2019 KTM 450 EXC-F
2019 Yamaha WR250F
2019 Yamaha YZ250FX
2020 Yamaha WR250F
2021 Yamaha WR250F
2022 Yamaha WR250F