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:|...
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
but i actually favor this
was that a rob north lashup ?
Last edited by XB33BSA; 12-15-2018 at 11:26 PM.
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.
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)
several questions still abound, like wider wheels, better forks or just mod what I have, etc.
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.
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...
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.
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...