Ducati Monster Muff on a DR650

Discussion in 'Thumpers' started by SeanF, May 11, 2010.

  1. SeanF

    SeanF Long timer

    Joined:
    Jun 11, 2004
    Oddometer:
    2,275
    Location:
    Tucson Arizona USA
    I wanted to reduce the weight & bulk of the DR650 exhaust while maintaining a relatively low noise volume. I did a dry fit of a muffler from a wrecked '94 Ducati Monster 900 and figured it could be made to fit. The 80 dB rating helps too.

    First, I cut off the midpipe from the stock DR exhaust. This will make it easier to mount the finished product to the header pipe.

    [​IMG]

    The intake end of the Ducati muff turns inward at a pretty good angle...too much to meet the DR midpipe. So I cut it off as well, with the intent to rotate & have it re-welded in the correct position.

    [​IMG]

    After dry-fitting the peices, and measuring for clearance from the tire, swingarm and brake caliper, a friend with the necessary skills welded it all up. I made a simple hanger from galvy steel.

    Result
    [​IMG]

    I painted the section forward of the muffler with silver heat resistant paint, which for some reason turned a brown/bronze color.

    [​IMG]

    Under the hanger strap is a few turns of muffler repair tape to separate the steel of the strap from the aluminum muff body.

    [​IMG]

    Snug fit.

    The stocker weights 13.2 lbs, this one 7.9 lbs. And it sounds great! :clap

    Cheers
    Sean
    #1
  2. Fubars

    Fubars What would Scoobydo?

    Joined:
    Aug 20, 2003
    Oddometer:
    2,004
    Location:
    Ventuna, California
    Nice job. I like it.

    Now for the dumb question--is it louder than stock?
    #2
  3. Ben99r1

    Ben99r1 Long timer

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    Mar 2, 2006
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    Pomona, Calif.
    Does it have a spark arrestor? Ben
    #3
  4. SeanF

    SeanF Long timer

    Joined:
    Jun 11, 2004
    Oddometer:
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    Location:
    Tucson Arizona USA
    To my ear it is the same volume as stock.

    Good question about the spark arrestor. Do street bike muffs have them?

    Sean
    #4
  5. TexBiker

    TexBiker Been here awhile

    Joined:
    Oct 4, 2006
    Oddometer:
    815
    Location:
    East Texas
    Every can I've seen with a spark arrestor was marked "USFS Approved". Not sure if that's a universal thing or not.
    #5