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What Fork Tubes Are These?

Discussion in 'XJ Technical Chat' started by maximike, Jun 22, 2012.

  1. maximike

    maximike Member

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    I've known for some time that my bike ('82 Maxim XJ750) didn't have Maxim 750 fork tubes on it, or at least I don't think it does. No air valve, no adjustment knob, which the manual says it should have.

    Here's a phone pic of the top of my right one, left one looks the same. The thing toward the bottom is just my windshield mounting bracket.

    [​IMG]
    2012-06-22 17.05.50 by epochal image, on Flickr

    Reason I ask, it's time to re-do the fork seals and I am not sure if it matters when getting parts what tubes I have. The rest of it is correct to my bike, I still have the dual disk brakes and other lower fork parts and everything, I think PO just had to replace the tubes and went with the ones from a 650? Or 550? I just want to get the right parts for these tubes before taking them apart.
     
    maximike, Jun 22, 2012
    #1
  2. zombiehouse

    zombiehouse Member

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    The 650 and 750 Maxim use the same fork seals according to Yamaha. The 550 Maxim has a single disk brake. Since you said you bike has dual disks, I would say you either have 650 forks of your 750 air valves have been replaced.
     
    zombiehouse, Jun 22, 2012
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  3. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    Measure the diameter of the fork tubes.

    The photograph we need is the one of the top of the fork LEG, where the tube goes in. That's where the variations in style of (dust) seals come in.

    A pic of the whole front end might help us too; since 650/750 Secas and Maxims had different style front brakes, it would reveal a swap of that nature.
     
    bigfitz52, Jun 22, 2012
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  4. zombiehouse

    zombiehouse Member

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    The 550, 650 and 750 Maxims all used 36mm tubes.
     
    zombiehouse, Jun 23, 2012
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  5. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    Which is why we need to see the rest of the front end. The lowers differ from Seca to Max and between models, and the style of brake will narrow it greatly.
     
    bigfitz52, Jun 23, 2012
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  6. maximike

    maximike Member

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    Okay, here's a pic I took at the same time of the tube going into the leg, sorry I didn't post them all before (ignore that broken turn signal, I'm in the process of replacing those, there was an incident)

    [​IMG]
    2012-06-22 17.06.25 by epochal image, on Flickr

    And I didn't take pics before of the brakes, but I have old pics of the bike that show the discs, here's one: (Hard to see rotor, but it's a slotted and dual)
    [​IMG]
    S5000675 by epochal image, on Flickr
     
    maximike, Jun 24, 2012
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  7. maximike

    maximike Member

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    Oh, here's one that shows front better, back when I had the military star paint scheme (and before I got a battery cover, lol) I wish I could blame that paint on the PO, but that's my handiwork, and the reason I had a friend paint it the next time;)

    [​IMG]
    0523091243 by epochal image, on Flickr
     
    maximike, Jun 24, 2012
    #7

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