CRF250L / Rally Yoshimura RS-4 Performance Exhaust Package
CRF250L / Rally Yoshimura RS-4 Performance Exhaust Package
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Everything you need to unleash the full potential of your Honda CRF250L or CRF250L Rally! Our Yoshimura RS-4 Performance Exhaust Package starts out with Yoshimura's RS-4 Full Exhaust System, which consists of the RS-4 muffler with turn-out end-cap, stainless steel header and mid-pipe, and low-volume insert. You can optionally add an EFI (electronic fuel injection) Controller, which is a plug-n-play device that will help take advantage of your new performance exhaust system and also make your bike run properly. Finally, you can also optionally add a 13 Tooth Front Sprocket and/or a Yoshimura Spark Arrestor Kit.

The Yoshimura RS-4 Muffler is a unique design with predicated power and a quiet earthy exhaust note that speaks volumes for performance. This RS-4 features all the benefits of Yoshi's original RS-4 muffler, but with a unique turned-out end-cap, designed to direct exhaust heat and gases away from the bike's components. To top-it-off, they embossed the Yoshimura "347" logo in the carbon for a clean look. A heat-shield was also added to the poly-resonant chamber to keep rider and passenger legs from exhaust heat. With all its benefits in mind, the RS-4 was an obvious choice for the CRF250L.

Fitment: 2017+ Honda CRF250L and Rally

Weight Savings:
CRF250L Stock Muffler w/ Heat Shield: 13.50 lbs
CRF250L Stock Header w/ Heat Shield: 3.12 lbs
CRF250L Stock FULL SYSTEM: 16.62 lbs

CRF250L Yoshimura RS-4 Muffler w/ Heat Shield: 7.80 lbs
CRF250L Yoshimura RS-4 Header: 1.46 lbs
CRF250L Yoshimura RS-4 FULL SYSTEM: 9.26 lbs


  • Yoshimura RS-4 Muffler with turned-out end cap
  • Yoshimura Stainless Steel Mid-Pipe
  • Yoshimura Stainless Steel Header
  • Yoshimura RS-4 Low volume insert
  • All installation hardware
  • Step-by-step instructions
  • Yoshimura Part #123400D520 (2017+ CRF250L / Rally)

    ** OPTIONAL: EFI Controller (adds to package price):
    An EFI (Electronic Fuel Injection) Controller is HIGHLY recommended any time you install an aftermarket exhaust and/or air filter on your fuel injected bike, otherwise you will see little to no performance gains, and the bike may even run poorly. At this time, we offer two different EFI options, the EJK EFI Controller and the JD Jetting EFI Controller. Details below. Each are simple to install and plug into existing wiring using stock connectors.
  • Pre-programmed specifically for a Honda CRF250L
  • Simple install. Plugs into existing wiring using the stock connectors
  • Simple and easy tuning with no dyno required
  • Simple Push Button Adjustment Interface
  • Does not require a computer or software to tune
  • "On-the-fly' tuning. You can make fuel adjustments in your garage or on the side of the road
  • Does Not Interfere with Stock ECU Operation
  • EJK EFI Controller 2017+ CRF250L - Part #9110044 (click for more info)
  • JD Jetting EFI Controller CRF250L - Part #JDHX03 (click for more info)

    ** OPTIONAL: Yoshimura Heat Shield (adds to package price):
  • Bolts up to Yoshimura muffler for extra heat protection
  • Made with USA made aluminum
  • Black anodized with laser etched logo
  • Must have for the CRF250L passenger
  • Part #990BG123400

  • ** OPTIONAL: 13T Front Sprocket (adds to package price):
  • Many CRF250L owners swap out the stock front sprocket for a smaller 13T, so we've added it as an option for our FMF performance package. The sprocket is made from case hardened nickel chrome molybdenum steel. Choose the option below if you want us to include the sprocket as part of the package.

  • ** OUT OF STOCK - We no longer carry this product. You might be able to find it and other exhaust systems at the following on-line retailers...
  • CRF250L Yoshimura RS-4 Slip-On Muffler at Revzilla
  • CRF250L Yoshimura RS-4 Full Exhaust System at Revzilla
  • CRF250L FMF Q4 Slip-On Muffler at Revzilla
  • CRF250L FMF PowerBomb Header at Revzilla
  • CRF250L FMF MegaBomb Header at Revzilla

  • CRF250L / Rally Yoshimura RS-4 Performance Exhaust Package
    YOSH-123400D520Retail Price: $629.00Our Price: $629.00
    Bike Model Year: 
    EFI Controller: 
    Heat Shield: 
    13T Front Sprocket: 

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