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  1. #1
    Join Date
    Sep 2008
    Location
    Omaha, NE
    Posts
    447

    Default Cast material on harley frame, need some info

    Does anyone know the alloy of which the rear cast part of the frame on an early 70's harley davidson might be? I'm doing a custom chopper that came in today and it's getting a kawasaki zx-9 swingarm and being converted to a progressive linkage mono-shock. This is going to require that i removew the OEM swingarm mounts and either flip them to the rear and re-attach them or make some from scratch

    The area where the swinger bolts up down to the rear-set area is some sort of cast steel I was just wondering if anyone knew what it might be to help me pick a proper filler rod for the job.


    On a side note,

    I can get some pics up if anyone i interested, it's going to be a really nice original piece it's aimed to be a raked out chopper (the front forks are as tall as i am) and it's getting the japanese bike rear end conversion along with a custom oil tank and a lot of other one-off bits here and there.

    The mounting of the swing-arm is going to be the most difficult part to do. To ensure the chain lines up and the rear brake doesn't drag i'm going to have to turn a set of wheel and rear brake spacers, and possibly add or remove some material from the rear sprocket mounting surface of the rim. I need to get it mocked up a little better with some temprary swinger mounts to start measuring and aligning the true mounts.

    It seems most people just move the motor and trans to the left 3/4 of an inch to get proper alignment but the customer stressed that he would really like if we could avoid moving the engine. The frame is unique to say the least the top motor mount is made from a pair of tire irons that run from the neck tube back to mid frame where they are welded again and then the both bend down and twist around each other to form the top mount. The guy has a great mind for being original but no longer has access to the machinery or any TIG experience and he really wants those beautifull TIG beads he said, so that's what i'm giving him He is also pretty torn up from a bad wreck and can't ride a hardtail anymore and is trying to come up with the most unique soft tail he can imagine...
    Dynasty 200DX
    Hobart Handler 135
    Smith MB55A-510 O/A setup
    Lathe/Mill/Bandsaw
    Hypertherm Powermax 45
    Just about every other hand tool you can imagine

  2. #2
    Join Date
    Nov 2005
    Posts
    130

    Default

    Pretty sure Harley used steel forgings, thats why necks can be raked and welded.

    How wide is your rear tire ?

    I've never run wide tires but I know that there are various solutions depending on width.

  3. #3
    Join Date
    Sep 2008
    Location
    Omaha, NE
    Posts
    447

    Default

    the tire is only a 180mm wide, but it's the jap swing arm tht makes it haarder to run
    Dynasty 200DX
    Hobart Handler 135
    Smith MB55A-510 O/A setup
    Lathe/Mill/Bandsaw
    Hypertherm Powermax 45
    Just about every other hand tool you can imagine

  4. #4
    Join Date
    Feb 2007
    Location
    Ukiah, Ca
    Posts
    280

    Default

    It is either cast steel or a forging, it can be welded with ER70S.
    AutoArc 230 (MM 210)
    3035 spoolgun
    Spectrum 625
    Dialarc HF w/Coolmate 4

  5. #5
    Join Date
    Sep 2008
    Location
    Omaha, NE
    Posts
    447

    Default

    Quote Originally Posted by bob_e95482 View Post
    It is either cast steel or a forging, it can be welded with ER70S.
    Well, I can tell from the surface that it's cast (Or they had a really rough forging face - for lack of a better term)

    I still havent' cut it apart to start on it yet, but the customer is kinda washy... here and there, gone and back, you never can get ahold of him when it's important, then when he does come to explain what he want's it seems like he's so f&ckered up on licquer that he can't finish a sentence. I sure hope he don't try and ride it in that condition once it's done.
    Dynasty 200DX
    Hobart Handler 135
    Smith MB55A-510 O/A setup
    Lathe/Mill/Bandsaw
    Hypertherm Powermax 45
    Just about every other hand tool you can imagine

  6. #6
    Join Date
    Jul 2008
    Location
    East Tennessee
    Posts
    615

    Default

    What about some pics of you progress ?

  7. #7
    Join Date
    Sep 2008
    Location
    Omaha, NE
    Posts
    447

    Default

    Quote Originally Posted by Showdog75 View Post
    What about some pics of you progress ?
    SO far no progress. I'm waiting on the owner to come and assemble the enginetranny combo as he states that if not done correctly the mounting tabs/ears will bust off the engine. I've had a ton of other car related stuff from custom aluminum radiators to intercooler pipes and waste gate flanges to do in the mean time.

    I will get some pics up sooner or later
    Dynasty 200DX
    Hobart Handler 135
    Smith MB55A-510 O/A setup
    Lathe/Mill/Bandsaw
    Hypertherm Powermax 45
    Just about every other hand tool you can imagine

  8. #8
    Join Date
    Nov 2005
    Posts
    130

    Default

    "if not done correctly the mounting tabs/ears will bust off the engine"

    Yep - True.

    Rear motor mounts need to be tightened first then fronts shimmed top last.

  9. #9
    Join Date
    Sep 2008
    Location
    Omaha, NE
    Posts
    447

    Default

    Quote Originally Posted by Chuck U&R View Post
    "if not done correctly the mounting tabs/ears will bust off the engine"

    Yep - True.

    Rear motor mounts need to be tightened first then fronts shimmed top last.
    Thanks for verifying that, this guy is a vietnam vet and i comend him for that but the amount of meds and alcohol he's on constantly makes me wonder what he dreams up and what is real sometimes.. Great guy though, he'd walk a mile in the desert sun on his crippled leg to get you a soda if you were thirsty and not expect anything in return, I"m very happy to be doing this for him.
    Dynasty 200DX
    Hobart Handler 135
    Smith MB55A-510 O/A setup
    Lathe/Mill/Bandsaw
    Hypertherm Powermax 45
    Just about every other hand tool you can imagine

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