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Thread: 10-hp 100cc Four-stroke (number discs?)

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  1. #1
    skooter Guest

    Default 10-hp 100cc Four-stroke (number discs?)

    I just purchased the 3M DirtBike [317-1000] with 4-stroke core kit and resonator. I will be re-jetting. What is the appropriate disc range for a 10-hp 100cc Four-stroke street-bike? What's your best guess on how many discs would be about 110 dBA? Also, I will be welding the exhaust to the pipe; should I weld first and then pack or is it fine to weld with the core kit installed?

    Thanks (smile).
    Last edited by skooter; 02-06-2009 at 01:06 PM.

  2. #2

    Default Discs for a 100cc 4-stroke

    Depending on what you're end goal is, you may want to add/subtract discs and see what gives you exactly what you're looking for. A customer of ours is running the 3M Steel Dirtbike pipe on his 125cc '73 Honda XL and he's running 18 discs and said people can hear him arriving from a mile away.

    Remember, adding discs will increase your horsepower, exhaust tone and flow. Removing discs will reduce the sound and increase your low-end torque.

    You'll want to weld first and then put the core in it.

    Good luck!!!

  3. #3
    skooter Guest


    Street bike. Looking for a general range when riding on the street without being too obnoxiously loud. Does 8 to 12 discs for a small-displacement four-stroke sound right? I just want to be in the ball-park before I start messing with jets.
    Last edited by skooter; 02-06-2009 at 03:46 PM.

  4. #4

    Default Discs

    I understand. That would probably be a good start.

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