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1980 Honda CB750F Cafe Build

This is a discussion on 1980 Honda CB750F Cafe Build within the Project Builds forums, part of the Caferacer.net Forums category; Originally Posted by CaTacL1sm Hmmm... what about an 80s style dustbin I predict that is going to be the next big cafe racer fad:|...

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Thread: 1980 Honda CB750F Cafe Build

  1. #31
    Senior Member TrialsRider's Avatar
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    Quote Originally Posted by CaTacL1sm View Post
    Hmmm... what about an 80s style dustbin
    I predict that is going to be the next big cafe racer fad:|

  2. #32
    Senior Member TrialsRider's Avatar
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    Quote Originally Posted by jcw View Post
    Attachment 96167

    Attachment 96173






    Anyone actually see one of these or a replica in person? Not me...
    I agree, I've seen plenty of 500's cruising around Cali with this type of fairing. Very tidy looking.


    From Barber Vintage Motorsports Museum Pt3. | Phil Aynsley | MCNews.com.au

    The Barber Vintage Motorsports Museum - Main Racing Hall


    Four factory Honda CR750s were raced at the 1970 Daytona 200 with Dick Mann winning the race on one. American Honda later made an extensive 200 piece “Race Kit” available through a few selected dealers to convert a CB750 into a CR. This is one of those “Kit Bikes” painted as Mann’s bike.


    https://www.motorcyclistonline.com/b...achine#page-13
    That sh*t right there is exactly what we all really wanted to be riding in my day.
    woodsman likes this.

  3. #33
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    Quote Originally Posted by jcw View Post
    that X on the headlight btw, it's retarded...
    lol but aren't you worried about it suddenly exploding on impact.

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  5. #34
    Senior Member TrialsRider's Avatar
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    Quote Originally Posted by cyclocrossfool View Post
    i know you dont ride your street bike with numbers/ plates on it, i dont know of anybody who road races that have numbers on a roadbike, big fox paw
    True that.


    I rode my MV wearing my spandex trials suit once, lol people were shouting 'pop a wheelie!' when I rode by, it totally sucked.
    Last edited by TrialsRider; 12-15-2018 at 06:43 PM.
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  6. #35
    Senior Member CaTacL1sm's Avatar
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    Quote Originally Posted by Teazer View Post
    Dustbin fairings were banned from racing is the mid fifties - not the eighties.
    I know, but imagine how wild an 80s dustbin would look
    Quote Originally Posted by alwhite00 View Post
    Fuck all of you guys. Get into your little circle jerk and have fun. Thought this may be a pretty cool message board but damn, you guys are assholes.

  7. #36
    Senior Member XB33BSA's Avatar
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    interesting histireical tidbit
    the dick mann 750cr factory daytona special used honda xl250 type sliders
    4 studs 4 nuts at each axle carrier clamp
    i see the kit bike there has got the 2 stud type
    yeah and that fairing is a beautiful and ill bet pretty slipery design Name:  dick mann daytona.jpg
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    but i actually favor this
    was that a rob north lashup ?Name:  mann4.jpg
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    Last edited by XB33BSA; 12-15-2018 at 10:26 PM.
    CaTacL1sm likes this.

  8. #37
    Senior Member CaTacL1sm's Avatar
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    you know, you could totally run a mailbox type fairing on the street if you get an LED light bar that would fit perfectly in the mail slot... then you could even tint it black (provided the light is bright enough) so that it would look full race spec
    Quote Originally Posted by alwhite00 View Post
    Fuck all of you guys. Get into your little circle jerk and have fun. Thought this may be a pretty cool message board but damn, you guys are assholes.

  9. #38
    Senior Member tjurek51's Avatar
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    that's it. that's what i'd like to do, for the most part. i'm not much on the history of the sport, mind you. still learning, so you all sharing this is great! my pic is just a mash up of ideas from various posts. Mostly from a variation of the MotoGuzzi style bike of the same era. YES, a stretch from that to a 80's CB750 F, but wanted to start with some ideas. Here, btw, are some ideas on changes and reinforcements. your thoughts are appreciated.

    Name:  Front View 20181216.jpg
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    for those who may recognize these ideas, I want to make sure I reference the project and give credit to the guys who did this. i'm not going to go to the extents they did, but I figure these mods are proven (by now)

    https://www.bikeme.tv/index.php/dons...-honda-cb900f/

    several questions still abound, like wider wheels, better forks or just mod what I have, etc.

  10. #39
    Senior Member TrialsRider's Avatar
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    Quote Originally Posted by tjurek51 View Post
    Note the caption under the photo of that front frame brace "These used to break when you hit a tree at 180km/h."
    That's about right; imho unless people are fracturing the stock frames somewhere they are just guessing those brace points are beneficial.

    Wider tires on their own are of little value compared to an upgrade to radial tires from bias tires, radials are available in fewer sizes and they are typically wider then the older tire tech.

  11. #40
    jcw
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    Wow. What a build.

    He basically re-engineered the entire bike. Can't even imagine how much he spent. If the machine work cost anything close to what I paid, that bike probably cost as much as 2 V4S Ducati.

    Guess that's what an unlimited budget buys you. All for 118hp...

    Attachment 96191



    IMO, bracing is good. This is based on what was braced on frames from the period (from the factory's subsequent models and race teams), my own FEA work on my frame, and some small wire models I constructed. The welding looks like quality work. You would do well to copy that.
    One area that didn't make sense to me was this.

    Attachment 96189

    Not sure why he wouldn't just extend a single diagonal piece to the upper right corner instead of part way.

    There is still a segment unbraced in the center of the frame from where the top center backbone connects to the side rails to where the subframe starts. Forces through the frame will seek out the weakest point, and to me that's it. Put it in a computer and run a FEA and it will flex here.

    Extending the X brace behind the frame as forward as you can helps tremendously. But you run into airbox clearance problems right away.


    Here is what I did...


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