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https://www.upshiftonline.com/bikes-blog/2017-honda-crf450rx-build

Honda CRF450RX — Off-road trail ready
By Jay Clark

  • This bike is Honda’s answer to KTM’s popular XC and Yamaha’s FX models. Honda has mainly gone after the full trail guys with the X models but this RX model is very close to their R motocross model. It comes with an 18” rear wheel, E start, and larger fuel tank.   For this build we tried to keep it a bit simple since the bike is very good in stock form.
  • For the motor we went with the Vertex High Compression Piston, a FMF slip on system with our stock header, a new HINSON BTL Slipper style clutch.
  • The mapping is also improved by Tokyo Mods with the stock ECU.
  • Factory Connection worked to help out the suspension as the RX comes stock a bit softer than the R model.
  • IMS Large tank and Cycra wrap around hand guards are for full on off-road mode.
  • TM Designs has the Chain block protection
  • Supersprox Stealth Sprocket for long durability
  • Dunlop AT81 off road trail tires
  • Tusk wheels with oversized front rotor
  • Works Connection radiator guards and extra pieces
  • For bodywork we used Cycra, Decal works, and Motoseat with their great pieces.

Highlights of the build

  • FMF Slip on stock Header
  • Tokyo Mods mapped the stock ECU
  • High Compression Vertex Piston
  • Removed back fire screen