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  1. #1

    Default Cb550 swingarm bobber

    Ok guys so I'm building a bobber out of a bike that really wasn't ever intended to be modified into anything other than a cafe or tracker. I'm doing it because I'm stubborn and really like the cb' (own 4 of them) and I want to do something almost no ones done.

    I've run into my first hurdle and thought I'd try making this my first post. The guys on my usual forum (sohc) really don't modify their frames. If they do it's to put a rear hoop on it and call it a day. And modifying a frame on that forum is almost looked at as blasphemy, which I'll never understand.

    Here's my issue. I'm going with a deep tunnel wassell style. Tunnel on the tank is 2". Neck with is 2". But when I sit it on the frame the tank hits where the tank mounts are. They slightly curve out .25" on each side. I'll have to remove the original mounts to get the new tank to sit where I want. Anyone have ideas on the best way to do this? Here are my options, I think

    1. Use a hole saw and drill clear through the frame. Then weld a patch over

    2. Take a hammer and nock the circular form down a bit

    3. Try widening the tunnel of the tank. Use a "backwards" clamp and pry the tunnel a bit

    I think #1 sounds like the best option but also the most work. #2 sounds too easy, but tempting. #3 do I really want to bend a brand new awesome tank? Would it bend/open enough without causing flex in other areas? How would you guys do it? Ideas appreciated.

  2. #2

    Default

    Wanted to post a pic but apparently that's a little hard to do on here

  3. #3

    Default

    here is a 72 cb500 with a bit of a mod on the frame. lolClick image for larger version. 

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  4. #4

    Join Date
    Sep 2012
    Posts
    11,464

    Default

    Quote Originally Posted by bigjeff View Post
    Click image for larger version. 

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    DAMN it!!!!!!!!!!!!! I'm speechless...........

  5. #5

    Join Date
    Sep 2014
    Posts
    226

    Default

    As far as the tank I'd cut the tunnel open farther and put new patch on the inside of the tank. That way the outside isn't effected

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