Ok. Talk me outta this? Or into it? Or smack me upside the head...

Discussion in 'Hacks' started by rat, Nov 24, 2020.

  1. rat

    rat Dirty Hippie

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    My other thread got me thinking about just... working with what I have.

    So what I have is a few SOHC CB750 engines, a GL1000 front end, a good '74 frame, all the bits and bobs and parts and whatnots to put together a full bike... and then it'd be a matter of finding a sidecar for a decent price.

    Now, if I were to do this, I could purchase/get a set of raked trees made, to bring my trail down to decent spec.

    This would get me into a rig for about as cheap as possible... I've got professional welders in the family, so the work would be done correctly.

    Please, point out the flaws in my thinking, set me straight.

    edit: another thought... I could use raked trees as stated, OR, (creating a few registration issues, but nothing insurmountable)... have a frame made with proper steering head angle. My thoughts being, if a raked tree would work just as well, it would save me work, and mean the bike would be usable without a sidecar, if I ever wanted to get back to "normal" with it, with a couple hour's work.
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  2. JustKip

    JustKip Long timer

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    Raked trees are not universally available. The ones on my Bonneville were cut and welded by a builder in Southern CA

    12189008_10208057743991935_4734209639941159154_n.jpg
    #2
  3. rat

    rat Dirty Hippie

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    I know of at least one supplier that'll make 'em for whatever you wish... whatever rake, whatever bike, whatever front end They ain't cheap, though (the trees are in the same price range as that custom frame I mentioned... but they would solve the registration issue, and the extensive work required for fabricating mounts for everything else, from oil tanks to foot controls). and I've got a link or two for folks who have them "off the shelf" for the GL1000 front end, if I recall correctly.
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  4. steam powered

    steam powered just a regular punk

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    Deraking the frame still requires custom triple clamps.
    Just using raked trees moves the front wheel forward relative to the steering axis reducing trail
    If you move the steering angle and keep the stock triples, you will move both the steering axis and front wheel and make minimal change to the trail.
    And then you would have to change the whole frame if you wanted to go back to a solo.
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  5. DRONE

    DRONE Dog Chauffeur

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    I wouldn't worry too much about the front end. Sounds like you can work it out some way or another if the stock trail is unmanageable. The bigger challenge is to work out the details of mounting the car (whichever one you decide on) to the bike in a workmanlike manner. IMO, based on your posts in this thread and the other one, and reading between the lines, I predict you're the kind of guy who can get it all figured out and put together just fine. Maybe only have to sell ONE of your other bikes to fund the project!

    Check out this guy's home build where he used angle iron to attach a car to his BMW.
    https://advrider.com/f/threads/champion-escort-on-an-r1150rt-build.1049030/
    Just takes a little imagination and skill.

    When you say "the great white north" are you in Canada, or Alaska? In other words, Kijiji country of Craigslist country?
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  6. Strong Bad

    Strong Bad Former World's Foremost Authority Supporter

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    What you want is a set of triple clamps that reduces the trail of the stock bike. Any good CNC machine shop could machine the triple clamps if someone did the drawing on software like Solidworks. Yes, it wont be cheep but not impossible, but like Drone says, don't worry about changing the trail until you have tried the rig without reducing it. It is very common for many guys to never change the trail on their rigs and get along just fine and dandy.


    "Raked trees" is an old term used by Harley Chopper builders from back in the 60's. It was used to describe moving the forks way out in front of the bike. I suppose if you re stuck on using the term "Rake" in your description, you would be using like Steam Powered says "de-raking" not "raking". But then I also get weird about people swapping the terms "Leading Link Forks" with "Earls Forks".

    Here's some rake/trail information examples:

    raketrail.jpg
    In this case "A" & "C" have the forks exactly parallel to the steering head angle. C has the steering head angle changed which was really common with the old choppers. "B" has the triple clamp changed but not the steering head. In the case of a trail reducing triple clamp it would obviously go in the opposite direction from what is shown here. Ignore the Yes/No in the pic for this discussion.

    raketrail .1.jpg

    raketrail.2.jpg
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  7. propforward

    propforward PIE!romaniac

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    I'm not going to talk you out of it. There are loads of examples of hacked SOHC CB750's. My first sidecar was a Spirit of America Eagle, which came off a SOHC CB750. If you like the idea of a hacked CB750 I'd just go for it, put a sidecar on and try it, and mess with steering mods later. Most likely you'll be happy with ride quality without modifying the triple trees. Of course, you may wish to do that mod anyway just because you want to.

    I do understand the opinion of buying an all ready made rig, but sometimes buying someone elses rig gets you "a rig", but not necessarily "the rig you really want". There is also no guarantee that whatever you buy is set up right. Go ahead and hack your CB750. Doooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo it.
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  8. rat

    rat Dirty Hippie

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    Kijiji country.

    As for some other comments...

    raked trees are used to bring excessive trail numbers on choppers back into something realistic... steering angle remains the same (steering neck is not modified, but angle of fork legs is front wheel is kicked out, reducing trail)

    having a custom frame made with say... 25 degrees of steering angle instead of 28, would reduce trail by the same amount as adding 3 degrees with a raked tree, just without the need to extend the fork legs.

    At the end of the day... a frame will cost me about $1K Canuck-bucks to have made. And a full custom "mate whatever front end to whatever bike" triple clamp would run me just shy of that. As stated... the triple clamp would allow me to switch back and forth if needed.

    But, as some have said... I'll probably just start hunting for a sidecar, slap on a set of beach bars, and see how it works as is.

    As for DMC sidecars... I ain't made of money. Geezuz. They're nice, but I can buy a decent used sideXside for that kinda scratch. Hell, I could find a used CJ or Dnepr, for that, toss the bike in the trash and still come out on top.
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  9. JustKip

    JustKip Long timer

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    For the price of a new, factory mounted DMC, you can find a nice used complete outfit, as many of us have.
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  10. TurTal

    TurTal Long timer

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    You're overthinking it



    This is all you need
    Sahara-R-3qtr-f1.jpg

    It'll do everything you need it to do

    You don't need to get on the damn Highway

    There's plenty to see and do just tootling around

    You'll meet more folks and have more fun than hauling ass down the Highway just to say you can

    Now get down to the Bank and get it over with already

    You've worked hard and you deserve a new toy


    Don't 4get to post pics of all your new Adventures

    Extra points for shit eating grins


    image-asset.gif

    .
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  11. rat

    rat Dirty Hippie

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    yeah... I don't have that kind of scratch, and I don't do "loans". But sure, it'd be my first choice, if the money was laying around.
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  12. Strong Bad

    Strong Bad Former World's Foremost Authority Supporter

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    I'm starting to lean towards rethinking if you should be smacked upside the head or not. :lol3:lol3:lol3

    Maybe I should have stopped at this guys place outside of Cave Springs Arkansas, to see what the custom "headthumpers" looked like, could have come in handy?

    134.JPG
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  13. TurTal

    TurTal Long timer

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    Ok everybody chip in $20 @rat needs a Ural !

    .
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  14. DRONE

    DRONE Dog Chauffeur

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    The topic was hacking a CB750 and I was referring to using DMC for a CB750 mounting kit. Complete kit is $895. Don't know why you would think I was somehow recommending you buy an outfit from DMC. :dunno
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  15. rat

    rat Dirty Hippie

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    Ohhhhh. Sorry, I thought you were suggesting buying the whole sidecar from 'em!
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  16. Scott of the Sahara

    Scott of the Sahara Been here awhile

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    I think the question is do you want to ride a sidecar or build a sidecar.
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