- OR -

Performance Full System

  • Performance Full System
  • Titan Full System
  • Performance Full System
  • Titan Full System
  • Performance Series
  • Titan Full System
  • Performance End Cap
  • Performance Full System
  • Full System Head Pipe
  • Titan Exhaust
  • Titan Full System
  • Performance Full System

Honda® Rancher 420

The Honda Foreman Rancher 420 is available as a Full System in the Performance, Titan, and Swamp Series. The Performance Series picked up nearly 4 horsepower with nearly 3lb of torque. The Titan-QS and Swamp Series picked up 2 horsepower with 2lb of torque, and the Titan-XL and Swamp-XL Series picked up 3 horsepower with 3lb of torque. At idle, the Performance, Titan-XL, and Swamp-XL are 2-4 dB louder than the stock muffler, while the Titan-QS and Swamp are only 1-2dB. The HMF Quiet Core can drop the volume roughly 1-2 dB more.

Exhaust Fits 
(14-18) Rancher 420: SRA (Solid Rear Axle)
(14-18) Foreman 500

Does Not Fit
(15-18) Foreman Rancher 420: IRS (Independent Rear Suspension) See Rancher 420: IRS
(15-18) Foreman Rubicon See Foreman Rubicon

Fuel tuning is required learn more

Fuel Tuning is absolutely required when installing an HMF Exhaust on this machine. Failure to tune the engine can cause excessive damage to the exhaust system and engine, while voiding the warranty on your exhaust and possibly on your machine. (check with local dealer). See the tuning settings below for the proper fuel tuning solution on your machine.

Exhaust Systems

Honda® Rancher 420 ATV Accessories

Tuning

Note An HMF Optimizer is absolutely required with or without airbox modifications.

Mode 1 Mode 2 Mode 3 Mode 4 Mode 5 Mode 6
            
3.5 4.0 0.0 4.5 4.0 4.0

Low Speed Fuel

Going down on the number scale will reduce low speed fuel. Going up on the number scale will increase low speed fuel.

Mid Range Fuel

Going down on the number scale will reduce mid range fuel. Going up on the number scale will increase mid range fuel.

High End Fuel

Going down on the number scale will reduce high end fuel. Going up on the number scale will increase high end fuel.

Green Lower Switch Point

Going down on the number scale will turn green mode on earlier. Going up on the number scale will turn green mode on later. These modes typically will not need adjusted from their base setting.

Yellow Lower Switch Point

Going down on the number scale will turn yellow mode on earlier. Going up on the number scale will turn yellow mode on later. These modes typically will not need adjusted from their base setting.

Red Lower Switch Point

Going down on the number scale will turn red mode on earlier. Going up on the number scale will turn red mode on later. These modes typically will not need adjusted from their base setting.

Optimizer Help

Click here to watch our HMF Optimizer tuning and installation video.

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