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Yamaha Raptor 660 Exhaust | HMF Performance Series

  • Yamaha Raptor 660 Exhaust | HMF Performance Series
  • Yamaha Raptor 660 Exhaust | HMF Competition Series
  • Yamaha Raptor 660 Exhaust | HMF Competition Series
  • Yamaha Raptor 660 Exhaust | HMF Head Pipe
  • Yamaha Raptor 660 Exhaust | HMF Performance Series
  • Yamaha Raptor 660 Exhaust | HMF Performance Series

Yamaha® Raptor 660

The Yamaha Raptor 660 is available as a Slip-On or Full System in the Performance and Competition exhausts.  Depending on the exhaust series, the slip-on system picks up 10-15% more horse power, while the Full System adds 15-25% more.  There will be a 4-6dB increase in sound when compared to the stock muffler, however the Competition Inserts and HMF Quiet Core can decrease those 2-4 dB.

Fits: (01-05) Raptor 660R, T, SET, YFM660RN

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® Raptor 660 ATV Accessories

Tuning

Recommended Tuning - Stock Air Box
Left Carb: 145-150 Mikuni Small
Right Carb: 150-155 Mikuni Small
Needles on 3rd position

Recommended Tuning - Modified Air Box
Left Carb: 150-155 Mikuni Small
Right Carb: 150-155 Mikuni Small
Needles on 3rd position

HMF Basic Jet Kit Includes
140, 145, 150, 155, 160  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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