CB750 Seven Fifty cafe-racer. Design v.2.0

After our return from France in the beginning of October 2015 I spent some time to clean up my garage and reassemble my own Zephyr, so I returned to Honda CB750 Seven Fifty cafe-racer project only in the beginning of the November.

I wasn’t satisfied with my first attempt to design the bike, so I tried initially to work out something better with parts I‘ve already used. But all my efforts didn’t achieve the goal.  There were a couple of bike foreshortenings I didn’t like. After few fruitless attempts to get satisfactory result  I decided to change   CB750 project completely.  Here you may see one of the last views of Seven Fifty cafe-racer,  let call it ver. 1.X design.

IMG_5645On this photo you also could admit new upper  fork triple. The trick is I used Nighthawk 750 triple which is much more useful  for cafe-racer project, it had better design than original one and also is completely compatible  with Seven Fifty lower yoke.

I began new modelling stage from the tank.  And this time I had the idea to use CX500 tank with its uncommon backward features. I may say that this idea was like a flash, but I used to have such a flashes after  comprehensive turning  of a question in my mind.  I also  quite good in parts selecting and searching, so I knew that CX tank will fit to the CB frame without modification or with minimal level of them and soon found CX tank on French ebay.

The tank arrived in the beginning of December 2015. Meanwhile, I also began producing  my first Zephyr cafe  kits for sale; and soon after that KZ650 project was started, as did production of another lot of Zephyr cafe kits,  so I had a lot of work and a shortage of time.  Even though I managed  to continue the Seven Fifty cafe project . I thought out  new design in my mind bit after bit, searched and collected parts, so in the beginning of March 2016 when I freed more time for Seven Fifty, I‘ve already had all components at hand.

The next significant change after the tank was the swingarm.  The original one is ugly overlong and thin piece of iron, may be a victim of Honda cheapening politics. I like Kawasaki aluminium swingarms with eccentric chain tensioners so I chose familiar to me Zephyr 750 swingarm for my CB750 cafe-racer.  It is, as I said,  of aluminium so is lighter then stock steel one and shorter, thus will be better for handling.  To use it and still have same chassis clearance you need 330mm rear shocks (original has 365mm from eye to eye). I didn’t chose shocks for this project yet, so I  used CB400 shock bodies  with temporary installed  Zephyr 750 springs.   Yet one design difference became front tire. I decided to use road 120/80-17 tire instead of initial 120/90-17 semi off-road  one.

Modelling is a great thing when you want to hit your target right in the bull’s-eye so I used a sculpture clay for new tail and seat  modelling and in couple of iterations got CB750 Seven Fifty cafe-racer  design ver. 2.0. I also used paper tape to mark  painting stripes and other stuff to pod  air filters imitation (the idea of such their positioning jumped in my mind in last moment before photo shooting ) and redesigned project was ready for public presentation.  Hope you like new design.

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4 Comments

  1. Martin

    Looks great, Brilliant work mate. What hubs did you use and was that CX500 tank an easy fit?
    Cheers

    Reply
    1. gazzz (Post author)

      Thank you for good words, Martin!

      The information about hubs is here in comments:
      http://www.gazzz-garage.com/2015/05/20/cb750-seven-fifty-cafe-racer-project-begins/

      As for CX500 tank, I had to do some tunnel tapping and made new mountings for it.

      Reply
  2. Martin

    Amazing project, I already bought cx500 fuel tank and prepared it for painting, but before doing that I need to make mounting changes, as You said. It would be great if you could send me few photos. Once again, I love your project and the way it is engineered is incredible, good luck.
    Regards from Lithuania 😉

    Reply
    1. gazzz (Post author)

      Hi Martin,

      Thank you for good words!

      Now I am working on the engine, so mounts still are only in “draft version”. I also have to manage question of electrical components positions before design of mounts will be defined. Sure, I’ll send you photos of mounts as soon as they will be ready.

      Kind regards,
      Nazar

      Reply

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