HMF Exhausts / Tech Resources / Install: Torque Range Modifier (TRM)

Tuesday, March 17th, 2009

Install: Torque Range Modifier (TRM)

The Torque Range Modifier (TRM ) is an insert that broadens the available torque range of the machine allowing for better "hook up" in certain conditions. The TRM is not a sound damping device and you should see no difference in speed and power. It cannot be used with a Quiet Core Insert or Spark Arrestor because only one of these can occupy the space in the exhaust at one time.

Note: Recalibrating the air fuel ratio is not needed.

Installation Instructions:
1. Do not attempt to remove the End Cap if the muffler is hot.
2. Remove the 3 allen screws and End Cap. See Figure 1
3. Insert the TRM into the Exhaust core. (Small end first) See Figure 2
4. Slide the TRM all the way into the core until the TRM outer flange bottoms out into the machined area in the End Cap. See Figure 3 The TRM should be flush with the muffler end cap. See Figure 4
5. Reinstall the End Cap and tighten the 3 allen screws.See Figure 5