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Mac 4 into 2 Exhaust

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  • Mac 4 into 2 Exhaust

    I have a Mac 4 into 1 exhaust on my 79 Special. The bike has been properly jetted for this setup. I am contemplating going to a 4 into 2 exhaust. Should I expect to need to re-jet the carbs?

    Thanks for any and all help.

    Larry
    Larry
    1979 XS1100SF
    1981 XJ650 Maxim
    1981 XS650 (Frame off rebuild/mild custom)
    1981 SR500 (Pristine Stock Original)
    1979 XT500 (Configured as a TT500)
    2008 HD Sportster (With Texas Ranger sidecar)
    1967 Honda 305 Scrambler (Frame off restoration)
    1966 Honda S90 (Frame off restoration/My first bike)

  • #2
    Originally posted by Roadman48 View Post
    I have a Mac 4 into 1 exhaust on my 79 Special. The bike has been properly jetted for this setup. I am contemplating going to a 4 into 2 exhaust. Should I expect to need to re-jet the carbs?

    Thanks for any and all help.

    Larry
    It's not likely, but you're not going to know until you do it. Bring it to XS Southeast, so we can get a good look at it.
    Marty (in Mississippi)
    XS1100SG
    XS650SK
    XS650SH
    XS650G
    XS6502F
    XS650E

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    • #3
      if you pull your current exhaust pls let me know i would be interested in it
      79 SF

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      • #4
        May end up a tad on the rich side, but that's WAY better than too lean with a ventilated piston.
        81H Venturer1100 "The Bentley" (on steroids) 97 Yamaha YZ250(age reducer) 92 Honda ST1100 "Twisty"(touring rocket) Age is relative to the number of seconds counted 'airing' out an 85ft. table-top.

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        • #5
          Thanks for all the responses, I appreciate the help. This will probably be a winter project, if I decide to go ahead with it.
          Larry
          1979 XS1100SF
          1981 XJ650 Maxim
          1981 XS650 (Frame off rebuild/mild custom)
          1981 SR500 (Pristine Stock Original)
          1979 XT500 (Configured as a TT500)
          2008 HD Sportster (With Texas Ranger sidecar)
          1967 Honda 305 Scrambler (Frame off restoration)
          1966 Honda S90 (Frame off restoration/My first bike)

          Comment

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