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Stock Exhuast Modification?

Discussion in 'XJ Technical Chat' started by jsngrimm, Jul 13, 2017.

  1. jsngrimm

    jsngrimm Member

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    Has anyone modified a stock XJ650 Maxim (or really any XJ) exhaust system/mufflers? Removed/modified baffles or drilled the circle of extra holes around the main exhaust outlet like the 550 Maxim has? Wanting to make my 650 Maxim not crazy loud but a little louder, and I like the look of the stock mufflers so I'd rather not lose those. Especially interested if I can safely add the extra holes in the end of the mufflers like the 550 Maxim stock pipes have.
     
    jsngrimm, Jul 13, 2017
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  2. Sal Raciti

    Sal Raciti New Member

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    I have drilled extra holes in the back. I did make it a little louder, but not really worth it. If you never plan on selling it then just do whatever you want.
     
    Sal Raciti, Jul 24, 2017
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  3. fiveofakind

    fiveofakind Well-Known Member

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    Do not drill any extra holes in your mufflers.....these bikes are designed to operate with a certain amount of backpressure from the exhaust system.....

    You gain no benefit by drilling holes in them.....you only make things worse......appearance and performance wise
     
    fiveofakind, Jul 24, 2017
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  4. jsngrimm

    jsngrimm Member

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    Did it affect performance at all? If it really affects performance in any way I would rather not do it. Do not want to have to rejet the carbs and all that
     
    jsngrimm, Jul 25, 2017
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  5. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    The factory exhaust is a fairy-fart away from being as free-flowing as open pipes are.
    Leave it as-is.
     
    k-moe, Jul 25, 2017
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    wgul and chacal like this.
  6. Craig B

    Craig B Active Member

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    Back pressure: The myth and why it's wrong.
    http://www.gomog.com/allmorgan/exhaustbackpressure.html
     
    Craig B, Jul 25, 2017
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    Stephen Downey likes this.
  7. fiveofakind

    fiveofakind Well-Known Member

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    Good article.....

    In my opinion...and only my opinion.....these bikes are great for keeping stock except for safety items.....

    To each his own....if someone wants to drill another 4 to 6 holes around the only one that is in the muffler to gain another decibel or two.....have at it.......bob and chop it too.....

    I guess I am a purist when it comes to these bikes

    Again......just my opinion.....
     
    fiveofakind, Jul 25, 2017
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  8. Paul Howells

    Paul Howells Active Member

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    They aren't making any more stock xj650 mufflers so I wouldn't be drilling holes or cutting out baffles.
     
    Paul Howells, Jul 26, 2017
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  9. fiveofakind

    fiveofakind Well-Known Member

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    If someone wants a bike that are louder than our Hardley's, then they should go buy a Harley.......

    In my opinion, these bikes are meant to be kept stock for the most part........not bobbed and chopped and podded........but then that is just me.....
     
    fiveofakind, Jul 26, 2017
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    hogfiddles and Craig B like this.
  10. fiveofakind

    fiveofakind Well-Known Member

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    A lot of Harley riders cut their teeth on these bikes.....
     
    fiveofakind, Jul 26, 2017
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  11. Chitwood

    Chitwood Well-Known Member

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    Very good friend of mine worked for Harley as a service tech for 10-12 years and his daily ride is a 78 or 79 cb400 hard tail chop...
     
    Chitwood, Jul 26, 2017
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  12. Chitwood

    Chitwood Well-Known Member

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    This was in the dealership parking lot.
     

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    Chitwood, Jul 26, 2017
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  13. Stumplifter

    Stumplifter Well-Known Member

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    Wow. Is that a truly functional suicide shifter on that thing?
    It's yuge!
     
    Stumplifter, Jul 26, 2017
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  14. Chitwood

    Chitwood Well-Known Member

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    Sure Is! Got a Harley clutch perch on the shifter which is where the clutch actually is. Worked out that the mirror is affixed to the perch same as it would if it were on the handlebars. It's quite the little machine. It's not dubbed the junkster for no reason haha.
     
    Chitwood, Jul 26, 2017
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  15. fiveofakind

    fiveofakind Well-Known Member

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    FLAME ON Torch.....
     

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    fiveofakind, Jul 26, 2017
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  16. hogfiddles

    hogfiddles XJ-Wizard, Host-Central NY Carb Clinic Moderator Premium Member

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    That explains why a lot of them are toothless
     
    hogfiddles, Jul 27, 2017
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