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main jet sizes

Discussion in 'XJ Modifications' started by casperdog21, Jul 5, 2011.

  1. casperdog21

    casperdog21 Member

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    I am at the moment cleaning and checking my carbs, My question is what are the correct main jet size {xj650 1981} the main jets that are in have 925 stamped on, :? it is a lot different from the ones you guys talk about, The bike ticks over ok but when you open the throttle it hangs back and then its off like a rocket, its not the control I require, hope someone can help
     
    casperdog21, Jul 5, 2011
    #1
  2. moellear

    moellear Member

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    mine (same bike possibly? - non YICS) have "120" and "RD" stamped on the main jets. from what I recall, 120's are common for over here in the states. not exactly sure why 925 or what it means..
     
    moellear, Jul 5, 2011
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  3. matie69

    matie69 Member

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    Hi there

    27-925 is Mikuni part number for a 157.5 large round jet....??Fits N100/604

    Possibly that this is size of the mains already fitted to your bike.
     
    matie69, Jul 6, 2011
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  4. lancial

    lancial New Member

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    well idk what my jet size is. but i know that those 650s dont make real power until 4000 rpms. so maybe its just ur mind playn games
     
    lancial, Jul 9, 2011
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  5. chacal

    chacal Moderator Moderator Supporting Vendor Premium Member

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    Stock jets:

    Main fuel: #110
    Pilot fuel: # 40
    Main air: # 50
    Pilot air: #195

    Main jet needle: Size Y-10
     
    chacal, Jul 9, 2011
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  6. Threefingers

    Threefingers New Member

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    I've got a 82 xj750 Maxim i'm rebuilding the carbs and wondered if anyone could tell me what jets i would need if i have drilled 8 holes in each side of the stock mufflers and i am going to put a filter on each carb. or would the stock jets be ok ?
     
    Threefingers, Jul 23, 2011
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  7. wizard

    wizard Active Member

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    Rule of thumb after fitting pods, is 3 up on the mains & 1 up on the pilots.
     
    wizard, Jul 23, 2011
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