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Will xj550 carb hats fit 1982 xj650 Maxim?

Discussion in 'XJ Technical Chat' started by 750MaximSeattle, Jul 26, 2015.

  1. 750MaximSeattle

    750MaximSeattle Active Member

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    I've got a spare xj550 Maxim carb with nice shiny chrome covers (the two outside ones are chrome, two inside ones are the typical dull finish) and I'd like to swap all 4 covers onto my xj650 Maxim carb. According to my internet search results the part numbers differ, but in person the parts look identical. Are they the same form and same bolt pattern?

    Parts diagrams details the following models with these carburetor diaphragm cover part numbers:

    xj550H J K (1981-3) Maxim - Cover, Diaphragm 4G0-14958-00-00 & 4U8-14958-00-00
    xj650G H (1980-1) Maxim - Cover, Diaphragm 4H7-14958-00-00 & 4H8-14958-00-00
    xj650J (1982) Maxim - (No call-out for the 'Cover, Diaphragm' on parts diagram)
     
    Last edited: Jul 26, 2015
    750MaximSeattle, Jul 26, 2015
    #1
  2. Trainer6

    Trainer6 Member

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    I will be looking forward from hearing from the guys here. What I have been told so far is that the carbs on 550 and 650 are interchangeable. On my search list, earlier, I kept my eyes open for a set of carbs from either/or machine. However the individual parts of the carbs will be an interesting discussion.
    I won't call it good advice but you could use the reverse of the OJ method. "if it don't fit, you must acquit". If all the measurements stack up you may be in luck.
     
    Trainer6, Jul 26, 2015
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  3. MN-Maxims

    MN-Maxims St. Paul Minnesota

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    550 carbs are made by Mikuni and the 650 carbs are Hatichi. They may look similar and maybe fit. Check inside and depth where the slide spring goes to see if that the same.
    xj4ever has the right ones if you are interested. I also like the stainless steel socket head screws to replace the original rusty phillips ones Len has.
     
    MN-Maxims, Jul 26, 2015
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  4. hogfiddles

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

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    I would not try swapping them

    Dave F
     
    hogfiddles, Jul 26, 2015
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  5. chacal

    chacal Moderator Moderator Supporting Vendor Premium Member

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    They will not interchange, at all, in any way, unless you have more money than God and are willing to spend it on this type of project. The carbs are completely different.

    XJ650 (except turbo models) and all 1981-83 XJ750 model carbs will physically interchange (they are all the same Hitachi HSC32 series carbs), but, the jetting and main needle are all different between the 650 and 750 carbs. Those parts can be physically interchanged though.
     
    chacal, Jul 26, 2015
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  6. hogfiddles

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

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    And that's exactly why I would not even try
     
    hogfiddles, Jul 26, 2015
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  7. 750MaximSeattle

    750MaximSeattle Active Member

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    Great advice, guys!
     
    750MaximSeattle, Jul 26, 2015
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  8. k-moe

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

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    You can probably epoxy them on. I wouldn't do that though.
     
    k-moe, Jul 26, 2015
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