Z50R Simulated Swingarms

Discussion in 'Modifications' started by preventec47, Apr 10, 2019.

  1. preventec47

    preventec47 Member

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    I am obsessed with acquiring an extended swingarm and I know the MAX I would consider would
    be plus 8 in. I was playing with drawing program and moved my wheel rearwards approximately
    the same as diameter of the wheel. TrailBuddy doesnt know anything about their 6in swingarm
    having never sold one and has no mfgr data, alloy data... I have asked for dimensions as proof as
    to what it fits and the weight. I am afraid of someone welding up a swingarm using a soft non heat
    treated aluminum alloy. ie what soft drink cans are made of.

    In any case I found about fifty different pics of Z50s with swingarms but very few with exact details
    as to which manufacturer and exact length. I will soon create a photo gallery of all the swingarm
    examples with an external link as the result of all my research.

    I found several pics of swingarms swapped from other honda models but some require
    modification and I dont know what the exact lengths are
    or whether they heap on a lot of added unnecessary weight.

    My simulated photo was created with fifteen minutes of figuring out how to use "Paint" in
    Windows 10. Paint now has some 2D and 3D drawing capability. The bike used seems to
    be nearly the same model as I have.

    BTW....If you think the picture looks extreme......
    I believe the new 2019 Monkey with 125cc has a 45 inch wheel base and
    IF I were to add an 8 in Swing arm as shown, the new wheel base for the Z50 would
    be 43 inches. I guess appearance is all about "proportion"

    Honestly I care mostly about handling and ease of riding and expect that I will be riding
    somewhat of a franken monster but not so much as some others that I have seen
    like the Hill Climb z50 machine which probably had 24 inches or more. of extension.

    What is important is the ability to return to stock format for value purposes.
    almdone1-wrk3_ 8-inch.jpg
    What do you think ?
     
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  3. dirtbkr188

    dirtbkr188 Active Member

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    Personally, it'll never work with the lower shock mounts that far back on the swingarm, if you could even find a pair of shocks that long that have the 10mm mounting holes.
    As far as proportion, keep in mind that the Monkey 125 has a bigger frame with a 30" seat height and utilizes 12" wheels front and back. If you tack on an additional 8" to your bike, you'll need to also raise the front forks or use a front end with hydraulic forks, otherwise the swingarm will look out of proportion compared to the rest of the bike, more so with the stock 8" wheel.
    The pic of my Z in the other thread with the XR80 swingarm and 330mm shocks measures at 40" WB with stock front forks and springs.
     
  4. preventec47

    preventec47 Member

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    # 1979 XR80 Swing Arm +4 donemonkeyrightov1.jpg # 3058_3958_L.jpg # 4094.jpg # 23347a.jpg # Asian Concept +8cm swingarm with 330mm shocks 1G.jpg # Curved Swingarm he1002mso.jpg # Ebay plus16 (1).jpg # ebay &swingarm-G.jpg DirBikr- Without a doubt your bike looks great. There are about a half dozen suppliers of plus 6 inch swingarms
    and a few that offer 8inch and larger swingarms. I just wanted to use the wheel width in the picture to play
    with a simulation. WeeBike and G-Craft both say the six and eight inch plus swing arms use the 330mm shock
    due to their moving of the shock mount tabs on the eight inch.
    Did you ever measure the exact length of your XR80 swingarms as compared to stock ? .
    I would like to look at the picture of your bike and know what swingarm it is equivalent to.

    Memory is fuzzy, is the XR80 one of the ones that require modification to fit ? I cannot alter the
    frame in any way so as to preserve going back to stock.
     
    #3 preventec47, Apr 10, 2019
    Last edited: Apr 10, 2019
  5. dirtbkr188

    dirtbkr188 Active Member

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    The XR80 swingarm is 15-1/2" from the swingarm bolt hole center to the very end, where the chain adjuster goes. The swingarm I took off of the bike measures 11-1/2".
    I trim the 3/8" from the inside ears of the XR80 swingarm to fit the stock width swingarm mounting hole on the frame.
     
  6. preventec47

    preventec47 Member

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    That sounds like a Plus Four inches quantifier for the XR80 swingarm.

    Thank you for the measurements. To be careful I think it better to measure from the swing arm
    center to the slot where the axle is located in the swingarm. I have seen several swingarms
    with different style ends and mechanisms for tightening the chain but it is likely that since
    both of your swingarms were HONDA OEM the adjustment portions of the swingarm are
    identical.

    On the stock OEM swingarms do you think they are hollow tubes or solid steel bars ?

    IF they are hollow then it would be a lot easier to cut and insert round rods for welding extensions.

    If anyone has displaced old original swingarms from the Z50R for cheap, I would like to experiment
    with welding. Please let me know.

    Thanks Scott
     
  7. dirtbkr188

    dirtbkr188 Active Member

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    They are hollow, the swingarm on my '98 Z was made by cutting the swingarm, using a solid bar with turned down ends to fit into the swingarm pieces, and then welded together and gusseted along the bottom for added strength. I didn't make it, I bought it some years ago from a friend who had it made

    6krHjL.jpg
     
  8. preventec47

    preventec47 Member

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    Here is my Plus 8 inch Swing Arm 1981 Z50R with thanks to many who helped in my research ##DSC_6129J.jpg ##DSC_6195J.jpg ##DSC_6133.jpg ##DSC_6173J.jpg ##DSC_6255-.jpg ##DSC_6283-.jpg
     

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