Yoshimura Slip-On Exhaust Installation

An aftermarket 'slip-on' exhaust provides a more freely flowing path for the exhaust gases for the purpose of improving engine output. It is called a slip-on because the new midpipe attached to the replacement muffler just 'slips on' over the stock header pipe. Another result is a louder and more pleasing exhaust sound over the more restrictive and quieter stock exhaust. The stock bike is jetted lean at low engine rpm but overly rich at high rpm. A 'race exhaust can' increases the engines breathing ability with the result of leaning out the mixture at all engine speeds. This means that stock jetting will be even more lean at low rpm resulting in softer low rpm performance but the mixture will be improved at mid and high rpm for improved performance in that region. Carburetor rejetting is used to reclaim the lost low rpm power and to fine tune the mid and upper end even more. This page describes the installation of a Yoshimura Titanium TRS Race Tri-Oval Slip-On Exhaust Pipe. I decided on this pipe over the quieter Yosh Zyclone after Ivan informed me that the Zyclone was only a little less restrictive than the stock pipe while being only a little quieter than the TRS Race Pipe. I preferred the Titanium over Stainless Steel for slightly lower weight and as a matter of personal visual preference. I purchased the pipe from Ivan to get it delivered without the Yoshimura riveted-on nameplate to preserve more of a stock look. However, Ivan says he can no longer obtain these.

The first step in installing a slip-on is to remove the stock pipe.

Remove Stock Pipe:

  • Allow Stock Exhaust to Cool.
  • Loosen Stock Exhaust Pipe Clamp (12 mm Wrench).
  • Detach Stock Exhaust Bracket at Right Footpeg (8mm Allen Wrench).
  • Pull Stock Exhaust Off Header Pipe (mine did not have the expected gasket).

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A more detailed alternate description of this procedure can be found here.

Yosh Pipe Installation:

To install the pipe:

  • Fit Rubber Heat Insulator Onto New Muffler Clamp.
  • Verify New 2.75" Stainless Steel Exhaust Clamp is On End of New Pipe.
  • Push Yosh Pipe Onto Header Pipe Until a Thud or Clunk is Heard (there is no gasket).
  • Rotate Pipe Until Center Stand Stop on Pipe is Lined Up With Rubber Stop on Center Stand.
  • Slide New Muffler Clamp with Heat Insulator Onto Muffler.
  • Attach Muffler Clamp to Footpeg Bracket (Inside or Outside) (this may require some more rotating of the pipe).
  • Verify Sufficient Clearance Between Swing Arm, Rear Brake, and Muffler.
  • Tighten Stock 8mm Hex Bolt (torque to 18 lb-ft).
  • Tighten New Pipe Exhaust Clamp (torque to 9 lb-ft, may not be able to fit torque wrench without deep hex driver).
  • I Did Not Mount the Securing Rivet.
  • Wipe Down Muffler and Pipe with Rubbing Alcohol to Remove Oils and Fingerprints. This helps prevent tarnishing when heat is applied.

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Ride Report:

As expected, a little responsiveness and power was lost at the low end of the rpm range but there was a noticeable gain at the mid-range and at the high end. Installation of a proper jet kit restored that lost low end. The sound was a bit of a drone at low rpm but transitioned to a nice racing bike wail at high rpm.

Addendum:

Following a low-side that scratched the pipe I replaced the Yosh with a Holeshot High-Mount.

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Last Updated: 04-30-2005

Copyright © 2001-05, Patrick Glenn, All Rights Reserved.
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The information presented here reflects solely my personal experience with my motorcycle and is presented for entertainment purposes only. No information presented here is to be relied upon for issues of rider safety nor to replace the services of a qualified service technician. Any attempts to follow or duplicate any of these procedures are done so completely at your own risk. By reading the information on this site, you agree to assume complete responsibility for any and all actual or consequential damages that may arise from any information presented herein.