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Yamaha Big Bear Exhaust | HMF Performance Series

  • Yamaha Big Bear Exhaust | HMF Performance Series
  • Yamaha Big Bear Exhaust | HMF Performance Series
  • Yamaha Big Bear Exhaust | HMF Performance Series

Yamaha® Big Bear 400

The Big Bear 400 is available as a Slip-On in the Performance Series.  The slip-on exhaust system picks up 10-15% more horse power and torque throughout the power curve, and weighs substantially less that the stock exhaust.  The Performance exhaust is typically 4-6 decibels louder than the stock exhaust, but the HMF Quiet Core insert can lower that 2-4 dB.

Fits: (00-12) Big Bear 400, YFM40FV, FR, 4WD

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

Yamaha® Big Bear 400 ATV Accessories

Tuning

Recommended Tuning
120 Mikuni small 

HMF Basic Jet Kit Includes
115, 120, 125 Mikuni Small

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.

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