Author Topic: Frame Bracing  (Read 11760 times)

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Offline bwaller

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Re: Frame Bracing
« Reply #25 on: January 19, 2014, 04:24:10 pm »
Yeah, I know Brian, I'm not trying to hide anything. It'll be whatever tech decides. I'm just sick of fooling with the stock frame front. I discovered my steering head wasn't straight to begin with. It doesn't take much to create many issues that I scratched my head over for three years. Putting it on a jig right off would have saved me lot's of foolin around. It's likely a fluke, one frame off...but I bloody wonder! Sound familiar?  ;)

Offline Tintop

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Re: Frame Bracing
« Reply #26 on: January 19, 2014, 05:54:37 pm »
Given all the issues you had with engine / hub etc alignment, it was either a very bad original factory build; or got dropped at some time.  It will be interesting to see what tech does, but can't see it should be an issue given a Seeley, or Rickman are eligible.  The rules say - "Period style “special” frames are allowed eg Drixton, Metisse, Rickman."  Also says production / street frames can be 'modified' for racing.  Does lift the bar though.  Definitely be in the stands watching & cheering. ;D ;D

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1980 CB750F (project)
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1976 CB400 SS - stock / BOTM 04/11 (SOLD)
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Offline Howell

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Re: Frame Bracing
« Reply #27 on: January 20, 2014, 01:20:06 pm »
I would have preferred a completely new lightweight frame, but to comply with class rules the frame must be stock based.

Davies motorsport has a stock based lightweight frame, we used it in our CB500 racer.
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Offline simon#42

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Re: Frame Bracing
« Reply #28 on: January 20, 2014, 01:58:20 pm »
thats nice brent , like the top tubes you have put in , not so keen on the lowers [ bending round the down tubes ] but i know you are limited to what you can do . watch where the short tubes meet the down tubes , with the engine in place strengthening the lower cradle you will get quite a bit of torsional stress there . just an observation not a criticism as i think this will be a huge improvement on your previous frame .  cant see it being long before you build a complete frame now though !

Offline MRieck

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Re: Frame Bracing
« Reply #29 on: January 20, 2014, 02:01:08 pm »
Yeah, I know Brian, I'm not trying to hide anything. It'll be whatever tech decides. I'm just sick of fooling with the stock frame front. I discovered my steering head wasn't straight to begin with. It doesn't take much to create many issues that I scratched my head over for three years. Putting it on a jig right off would have saved me lot's of foolin around. It's likely a fluke, one frame off...but I bloody wonder! Sound familiar?  ;)
You know Brent it isn't a problem until you start beating everybody else in your class....then the $hit storm starts. ::) ;)
Owner of the "Million Dollar CB"

Offline Tintop

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Re: Frame Bracing
« Reply #30 on: January 20, 2014, 03:11:43 pm »
Yeah, I know Brian, I'm not trying to hide anything. It'll be whatever tech decides. I'm just sick of fooling with the stock frame front. I discovered my steering head wasn't straight to begin with. It doesn't take much to create many issues that I scratched my head over for three years. Putting it on a jig right off would have saved me lot's of foolin around. It's likely a fluke, one frame off...but I bloody wonder! Sound familiar?  ;)
You know Brent it isn't a problem until you start beating everybody else in your class....then the $hit storm starts. ::) ;)

He's already doing that. ;D ;D ;D ;D ;D ;D
1977 CB550/4 Cafe - Speed Warrior / BOTM 03/11
1980 CB750F (project)
Whittaker GBF Vintage Racing Sidecar (XS750 power) - ITG / 151's / CMR Racing Products (SOLD)
1976 CB400 SS - stock / BOTM 04/11 (SOLD)
1973 CB750 K - basket case (SOLD)
77 CB550 Cafe build
550/750 Filter Thread
Sidecar Rebuild Thread

Offline Kemp

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Re: Frame Bracing
« Reply #31 on: January 25, 2014, 07:54:49 am »
Brent, what tank are you using on that new frame?

Offline bwaller

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Re: Frame Bracing
« Reply #32 on: January 25, 2014, 09:27:33 am »
I had Denis build an alum. tank to fit.

Offline spiritof67

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Re: Frame Bracing
« Reply #33 on: February 15, 2014, 11:38:23 am »
Switching back to the original subject (CB750) I'll post photos of what Dave the Builder has done with mine.

Offline SoyBoySigh

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Re: Frame Bracing
« Reply #34 on: March 29, 2016, 07:07:02 am »
That lightweight frame is NICE. I don't suppose anybody makes one for the DOHC-4 series?

I mean, I realize there's all of the Bimota HB2/HB3, the Harris Magnum, Nico Bakker & Moto Martin, Egli & Rau etc - the aftermarket CAFE RACER kit frames (that's what they were called at the time, when they were advertised in magazines such as "CAFE RACER" magazine which was published well into the mid-late '80s -

But yeah, I'm speaking here specifically of a stock-based frame. OEM style but Chrome-Moly. Heck I'd settle for any of those others too of course. Though I'd have my preferences.

Been thinking for some time now, that everybody in the SOHC and DOHC "hobby" should collectively organize an e-mail campaign to get somebody to bring back the popular stuff particularly the Bimota HB1 and EGLI frames.

PAUGHCO would be a great company to request this from, IMHO. They're already set up making frames in mass quantity and lowest prices for some time now, all Harley hard-tail traditional chopper/bobber type of stuff. But with the recent surge in interest with JAPANESE customs (which was sooooo uncool once upon a time what with all of the lingering "was it made by a 'white' guy?" pathos resplendent throughout motorcycling) well, they're already making both their weld-on and bolt-on hard-tail kits AND full chopper/bobber frames for the most popular Japanese models like CB750 SOHC, XS650, KZ900 etc - Well I'm sure they'd be LOOKING for new markets. One would think they'd be interested in an EGLI style light-weight frame for various inline fours, or at the very least the Bimota HB1 - only the ten bikes ever made and valued at a cool million meanwhile a million donor bikes out there to work with? It's a slam dunk! SOMEBODY needs to build this frame, heck even Bimota themselves should be in on it.....

-S.

Offline SOHC4 Cafe Racer Fan

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Re: Frame Bracing
« Reply #35 on: April 03, 2016, 12:55:49 pm »
I never get sick of seeing that cool frame.  Denis does such great work.
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"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 and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

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Offline PeWe

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Re: Frame Bracing
« Reply #36 on: April 14, 2016, 03:34:46 am »
I could not resist to Google CB750 frame bracing.... found some
http://forums.sohc4.net/index.php/topic,84383.msg1316748.html#msg1316748

Not SOHC but it must be possible on a SOHC too.  scroll down the page and see pic
http://www.customfighters.com/forums/showthread.php?t=108194
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Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
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K2 engine build thread. For a complete CB750 -75
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Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967