Yoshimura RS-4/RS-4D Muffler Repack Kit

Item Number: 388120


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Product Description


Yoshimura RS-4/RS-4D Muffler Repack Kit

Off-road systems need to be repacked after 6-8 hours of use, or after each Race. Repacking your muffler at the suggested intervals is essential for your exhaust to perform the way it was designed. Dirty packing restricts airflow from your motor, which results in a loss of power and degradation of sound. Repacking your muffler with a Yoshimura exhaust repack kit allows for freer airflow from your motor, which restores lost power and improves the exhaust sound.

Each kit includes enough components to service one RS-9D muffler:

  • Stainless steel rivets
  • Rivet bands
  • End-cap decal
  • Silent sport premium muffler packing materials

Spec Details
Country Of Origin USA
Exhaust Type RS-4
Warranty 1 Year Manufacturer Warranty

Vehicle Fitment

Fitment is guaranteed or your money back plus free return shipping. Don't waste time installing a product that doesn't fit. We worked hard ensuring that this product is an exact fit on the vehicles listed below.


  • CRF450R 2011-2012


  • KX250F 4-Stroke 2010-2014
  • KX450F 2010-2014


  • DR-Z400S 2000-2009, 2013-2022
  • DR-Z400SM 2005-2009, 2013-2021
  • RM-Z250 2010-2014
  • RM-Z450 2008-2014


  • YZ250F 4-Stroke 2007-2013, 2019-2020
  • YZ450F 2010-2017
  • YZ450FX 2016-2017

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