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Author Topic: MessnerMoto - CB750 f2 Caferacer build - Exhaust pipe CNC bending  (Read 19283 times)

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Offline MessnerMoto

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Hi everybody;)

I am following this forum for more then a year now. A lot of people have already helped me with info they provided in this forum. It is time for me to start sharing my project :)

The goal of this project is to transform Honda CB750 f2(1978) in to a Caferacer. Every major component of this build will be designed by me. I will try to make this bike look like it was made in 70', but using modern materials, manufacturing processes, design tools etc... I am trying to make uniq and recognizable design for this bike.

You can follow my project on Instagram https://instagram.com/messnermoto/

I will start posting already built parts, one by one:

1.Top Triple Clamp

I am using front end from GSXR 600/750 k6/k7 in the build. Like I sad the idea is to create something with retro look but with improving performance. Original top triple clamp from Suzuki gives modern square design feeling.


https://instagram.com/p/5J2bz_t7-Z/

Top clamp is made from 6082 T6 aluminum using CNC machine.


https://instagram.com/p/5J2kr7N7-u/

I optimized weight of the clamp... Maybe it is to much but it will give that final touch to the clamp ;)


https://instagram.com/p/5J20qlt7_J/

Everything was designed in 3d using blueprints of Honda cb750 and Suzuki gsxr. All measurements were checked on real bikes.. Great resource for CAD parts is www.grabcad.com


https://instagram.com/p/5J82ait74K/

It is good to check things before making them ;)


https://instagram.com/p/5MscUzN7zd/

And CNC process


https://instagram.com/p/5J3kI8N7wa/

Clamp is designed in a way that demands machining from top and bottom. Holding tool is made to enable machining from top and bottom.


https://instagram.com/p/5J37uJt7xJ/


https://instagram.com/p/5J4HApt7xf/

And after polishing you get something like this


https://instagram.com/p/5J5vSBN7z2/

You can see how clamp is rounded from top and the bottom. Everything is in the details ;)


https://instagram.com/p/5J6atJt700/

I made a pocket to hide steering nuts because I think they look ugly when they are exposed...


https://instagram.com/p/5J8Ctot73G/

And then you need to have custom top nut :)


https://instagram.com/p/5J6ndqt71K

And then you can compare original and custom clamp.


https://instagram.com/p/5KCWlFt7_-/

I will stop here for now. Next thing is a custom bottom clamp and steering stem...
« Last Edit: December 27, 2016, 04:59:20 AM by MessnerMoto »

Offline knottedknickers

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Re: Slow Perfection MessnerMoto
« Reply #1 on: July 21, 2015, 11:00:31 AM »
That is beautiful! Well done. I had to look twice to see the pinch bolt holes (in this picture: https://instagram.com/p/5J6ndqt71K). Slick.

One question: What's the offset?
CB750 K6 http://forums.sohc4.net/index.php?topic=141388.0

The plural of "anecdote" is not "data" (Borgmann 2002:5).

Offline MessnerMoto

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Re: Slow Perfection MessnerMoto
« Reply #2 on: July 21, 2015, 11:06:48 AM »
Thanks. I tried to make "smooth" design with simple lines... I will post pictures with pinch bolts later.
Offset is 30mm. Fork holes 50mm

Offline 70CB750

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Re: Slow Perfection MessnerMoto
« Reply #3 on: July 21, 2015, 11:45:55 AM »
Following :)

Offline SOHC4 Cafe Racer Fan

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Re: Slow Perfection MessnerMoto
« Reply #4 on: July 21, 2015, 12:49:16 PM »
Welcome to the forum.  There are many folks using modern USD forks and (many of those using) Cognitomoto clamps and hubs.  You design is similar to that of Devin at Cognitomoto but has some variances, too.

Looking forward to seeing how your project comes together.  Keep the pictures and posts coming.
CB550K1 Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
Triumph Thruxton 1200 R
CB750K2 Bionic Mongrel (http://forums.sohc4.net/index.php?topic=132734.0) - Hibernating
CB750K7 Nine Lives Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Emeritus/Sold
RVT1000RR RC51-SP2 - Emeritus/Sold

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html)

Offline MessnerMoto

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Re: Slow Perfection MessnerMoto
« Reply #5 on: July 21, 2015, 01:12:18 PM »
Thanks on your welcome! :)

I saw what Devin from Cognitomoto is doing, great stuff!
I hope I will created something unique and different.

I will need your support;)

Offline knottedknickers

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Re: Slow Perfection MessnerMoto
« Reply #6 on: July 21, 2015, 01:32:17 PM »

I hope I will created something unique and different.

The hidden steering nut is certainly that!
CB750 K6 http://forums.sohc4.net/index.php?topic=141388.0

The plural of "anecdote" is not "data" (Borgmann 2002:5).

Offline MessnerMoto

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Re: Slow Perfection MessnerMoto
« Reply #7 on: July 21, 2015, 01:52:57 PM »

I hope I will created something unique and different.

The hidden steering nut is certainly that!

There are two reasons for hidden steering nuts.

1.The first one is obvious. Looks;) I tried to design some kind of cover but it didn't work out.

2. The second one is not so obvious. By hiding steering nuts I will gain 10mm in fork length. I hope this will enable me to put bigger wheel in the front. I am planing to run 18" wheels. Tire for the front will be 120/60zr18. I am still not sure, but I hope this gain of 10mm will help to clear exhaust  pipes :)

Offline SOHC4 Cafe Racer Fan

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Re: Slow Perfection MessnerMoto
« Reply #8 on: July 21, 2015, 03:24:49 PM »
Thanks on your welcome! :)

I saw what Devin from Cognitomoto is doing, great stuff!
I hope I will created something unique and different.

I will need your support;)

We are always happy to see a new project, and even more excited when someone brings some tradecraft to the build!!
CB550K1 Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
Triumph Thruxton 1200 R
CB750K2 Bionic Mongrel (http://forums.sohc4.net/index.php?topic=132734.0) - Hibernating
CB750K7 Nine Lives Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Emeritus/Sold
RVT1000RR RC51-SP2 - Emeritus/Sold

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html)

Offline FunJimmy

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Re: Slow Perfection MessnerMoto
« Reply #9 on: July 21, 2015, 08:24:18 PM »
The goal of this project is to transform Honda CB750 f2(1978) in to a Caferacer. Every major component of this build will be designed by me. I will try to make this bike look like it was made in 70', but using modern materials, manufacturing processes, design tools etc... I am trying to make uniq and recognizable design for this bike.

Beautiful top clamp but unfortuanatly everyone's doing the GSXR inverted fork swap these days. It's neither 70's period correct or unique. Conventional ZRX forks with Ohlins custom 30mm cartridges! Now that would be unique.
You never see a motorcycle parked outside of a psychiatrist's office!

CB550 Cafe Interceptor a Gentlemans Roadster
http://forums.sohc4.net/index.php?topic=27159.0

Online 754

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Re: Slow Perfection MessnerMoto
« Reply #10 on: July 21, 2015, 10:02:03 PM »
I like using the lockout that you hid so well.  I have used them on stems I built before..
Nice triple tree.. Like the rounded look..
Maker of the WELDLESS 750 Frame Kit
dodogas@telus.net
Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way
69 z50
OHV 200..(Trail 90)

Offline SOHC4 Cafe Racer Fan

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Re: Slow Perfection MessnerMoto
« Reply #11 on: July 21, 2015, 10:03:17 PM »
Yeah. The hide a nut recess is a trick touch.
CB550K1 Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
Triumph Thruxton 1200 R
CB750K2 Bionic Mongrel (http://forums.sohc4.net/index.php?topic=132734.0) - Hibernating
CB750K7 Nine Lives Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Emeritus/Sold
RVT1000RR RC51-SP2 - Emeritus/Sold

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html)

Offline MessnerMoto

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Re: Slow Perfection MessnerMoto
« Reply #12 on: July 22, 2015, 01:21:15 AM »
The goal of this project is to transform Honda CB750 f2(1978) in to a Caferacer. Every major component of this build will be designed by me. I will try to make this bike look like it was made in 70', but using modern materials, manufacturing processes, design tools etc... I am trying to make uniq and recognizable design for this bike.

Beautiful top clamp but unfortuanatly everyone's doing the GSXR inverted fork swap these days. It's neither 70's period correct or unique. Conventional ZRX forks with Ohlins custom 30mm cartridges! Now that would be unique.

Thanks FunJimmy on your comment!
It will depend on small details how it will all look together. In my opinion major drawback with modern inverted forks are holders for front fender... That doesn't look good.

I like using the lockout that you hid so well.  I have used them on stems I built before..
Nice triple tree.. Like the rounded look..

Thanks 754! Yea that rounded look gives the feeling of something that was made in 70'. Also rounded look increases time needed to machine clamp, because of machining needs to be done on both sides.

Online 754

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Re: Slow Perfection MessnerMoto
« Reply #13 on: July 22, 2015, 09:26:07 AM »
Looks like a Ceriani tree a bit. If you got an hourglass. Shaped cutter made, you could cut the outside profile in one setup..
Maker of the WELDLESS 750 Frame Kit
dodogas@telus.net
Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way
69 z50
OHV 200..(Trail 90)

Offline FunJimmy

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Re: Slow Perfection MessnerMoto
« Reply #14 on: July 22, 2015, 09:38:50 AM »
It will depend on small details how it will all look together. In my opinion major drawback with modern inverted forks are holders for front fender... That doesn't look good.

From what we've seen so far, I don't think you'll have too much difficulty sorting out an awesome looking work around.
You never see a motorcycle parked outside of a psychiatrist's office!

CB550 Cafe Interceptor a Gentlemans Roadster
http://forums.sohc4.net/index.php?topic=27159.0

Offline MessnerMoto

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Re: Slow Perfection MessnerMoto
« Reply #15 on: July 23, 2015, 06:37:52 AM »
Looks like a Ceriani tree a bit. If you got an hourglass. Shaped cutter made, you could cut the outside profile in one setup..

Shape is not constant if you follow contour from top view ;) But this was a learning process for me. Probably I could have simplified design to speed up machining process, but then the look will not end up so good :)

Offline zekd

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Re: Slow Perfection MessnerMoto
« Reply #16 on: July 23, 2015, 06:42:56 AM »
Please sell me one of those clamps!

Offline MessnerMoto

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Re: Slow Perfection MessnerMoto
« Reply #17 on: July 23, 2015, 07:22:38 AM »
Please sell me one of those clamps!

Wait a little bit..  I just started posting in this forum ;) But thx


Offline MessnerMoto

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Re: Slow Perfection MessnerMoto
« Reply #19 on: July 23, 2015, 09:52:55 AM »
... Personally I don't like this mirror finish. At the and I fill probably use some 2000 grit to lower reflection and to make more like a matte color finish.

Offline SOHC4 Cafe Racer Fan

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Re: Slow Perfection MessnerMoto
« Reply #20 on: July 23, 2015, 10:32:46 AM »
It's all a personal preference thing. I actually like the machined finish coming out of the CNC, too.
CB550K1 Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
Triumph Thruxton 1200 R
CB750K2 Bionic Mongrel (http://forums.sohc4.net/index.php?topic=132734.0) - Hibernating
CB750K7 Nine Lives Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Emeritus/Sold
RVT1000RR RC51-SP2 - Emeritus/Sold

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html)

Online 754

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Re: Slow Perfection MessnerMoto
« Reply #21 on: July 23, 2015, 10:37:31 AM »
Weigh them if you can .. And stem.
Have made a few Aluminum. Stems from 7075.
Why did you choose 6082 for trees over 6061?
Maker of the WELDLESS 750 Frame Kit
dodogas@telus.net
Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way
69 z50
OHV 200..(Trail 90)

Offline knottedknickers

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Re: Slow Perfection MessnerMoto
« Reply #22 on: July 23, 2015, 11:11:15 AM »
I will continue posting pictures of finished parts.

Sorry for the spam :)
:o Sorry, this doesn't fall under the definition of 'spam'! ;)
CB750 K6 http://forums.sohc4.net/index.php?topic=141388.0

The plural of "anecdote" is not "data" (Borgmann 2002:5).

Offline knottedknickers

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Re: Slow Perfection MessnerMoto
« Reply #23 on: July 23, 2015, 11:16:32 AM »
Please sell me one of those clamps!

Wait a little bit..  I just started posting in this forum ;) But thx
I'm interested as well. I noticed on your instagram page (https://instagram.com/p/5J5XIGN7zW) that you mentioned "Production line..." I confess, that made me sit up in my chair! ;)
CB750 K6 http://forums.sohc4.net/index.php?topic=141388.0

The plural of "anecdote" is not "data" (Borgmann 2002:5).

Offline calj737

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Re: Slow Perfection MessnerMoto
« Reply #24 on: July 23, 2015, 12:10:15 PM »
Your bottom clamp has no steering stop integrated into the part?
'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

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