1. Some members were not receiving emails sent from XJbikes.com. For example: "Forgot your password?" function to reset your password would not send email to some members. I believe this has been resolved now. Please use "Contact Us" form (see page footer link) if you still have email issues. SnoSheriff

    Hello Guest. You have limited privileges and you can't "SEARCH" the forums. Please "Log In" or "Sign Up" for additional functionality. Click HERE to proceed.

Mac 4-1 exhaust - rejetting needed?

Discussion in 'XJ Modifications' started by wgul, Jul 24, 2017.

Tags:
  1. wgul

    wgul Active Member

    Messages:
    230
    Likes Received:
    56
    Trophy Points:
    28
    Location:
    Boston
    Hey all. After much research here I wasn't able to find out if rejetting will be needed if I get the Mac 4-1 exhaust for my xj650. Mac states that it might not be needed. I'd like to hear some real world experiences with this aftermarket exhaust. I don't think I'd get it if I would need to rejet the carbs. I intend to leave the air filter as stock. I'll just stay with the temp patched stock exhaust until I find another used one in better shape. I appreciate any input on this. Thanks
     
    wgul, Jul 24, 2017
    #1
  2. jsngrimm

    jsngrimm Member

    Messages:
    83
    Likes Received:
    22
    Trophy Points:
    8
    Location:
    Akron,Ohio
    I do not know for sure, but most likely yes. I know there are some people here with the MAC system that would know
     
    jsngrimm, Jul 25, 2017
    #2
  3. Toomanybikes

    Toomanybikes Well-Known Member

    Messages:
    2,836
    Likes Received:
    815
    Trophy Points:
    113
    Location:
    Tsawwassen bc
    Did an xj650rj last summer with a Mac exhaust and it did need one size up to a 114 on main jet. Now that is a Canadian bike that started with a 112 main as original main jet so your bike should be a 110 stock jet you may need to go 2 sizes up. Us bikes set up a bit leaner for federal emission standards
     
    Toomanybikes, Jul 25, 2017
    #3
    Sasquatchan likes this.
  4. wgul

    wgul Active Member

    Messages:
    230
    Likes Received:
    56
    Trophy Points:
    28
    Location:
    Boston
    Thanks for sharing your experience. I'll have to go stock, which is fine.
     
    wgul, Jul 26, 2017
    #4

Share This Page