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Author Topic: RAT BIKE build (72' CB750K)  (Read 17855 times)

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Offline bjbuchanan

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Re: RAT BIKE build (72' CB750K)
« Reply #75 on: May 25, 2014, 09:55:34 PM »
Have you hit a hard bump with that rear hoop? I live in Port Chester and I know for damn sure we have some roads around here that could do it with those stock worn shocks

Maybe there is more clearance than it seems in pictures but it doesn't look like that much
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The dirty girl-1976 cb750k, Ebay 836, Tracy bodykit
Round top carbs w/ 38 pilots, middle needle position, airscrew 7/8ths out, 122 main jet
Stock airbox w/ drop in K&N, Hooker 4-1

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Offline cafesnrods

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Re: RAT BIKE build (72' CB750K)
« Reply #76 on: May 26, 2014, 08:16:47 AM »
Ditto on the rear light set up. Where did you get that?
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If you're going through Hell........keep going ; )

Offline Syscrush

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Re: RAT BIKE build (72' CB750K)
« Reply #77 on: May 28, 2014, 07:19:51 AM »
Quote from: nccb on May 23, 2014, 06:35:18 AM
very cool.  Looks like Data's visor :P
I think you got that ref wrong...

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Life is precious: wear your f'n helmet!
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FWIW, I'm not a shill for Race Tech - I've just got a thing for good suspension and the RTCE's are the most cost-effective mod for these old damping rod front ends.

Offline nccb

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Re: RAT BIKE build (72' CB750K)
« Reply #78 on: May 28, 2014, 10:22:48 AM »
Fine robocop then.
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Offline zekd

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Re: RAT BIKE build (72' CB750K)
« Reply #79 on: July 22, 2015, 12:36:45 PM »
Damn, It's been awhile since I've posted. Well in recent news, I decided to finally finish the bike properly. I also threw a GSXR front end on and I'm waiting on my wheels to come in. I'm also going to be cutting the rear frame and doing a different set up with an upsweep in the rear loop because over time I have come to hate the flat look of the rear end. Im going to also remove the electronics tray and the oil tank and relocate them. Ill be attempting to build the oil tank that sits in the empty area right behind the carbs, so stay tuned.
« Last Edit: July 22, 2015, 12:46:40 PM by zekd »
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Offline srizzors25

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Re: RAT BIKE build (72' CB750K)
« Reply #80 on: July 22, 2015, 01:46:21 PM »
Awesome!  You are doing a few things I really want to do with one down the line here.  Are you trying to run a 160 on the back?  Can't tell what size that is.  What are you doing to the rear swingarm? 

Looking awesome though.  Handful of cognitomoto parts up front?
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Offline SOHC4 Cafe Racer Fan

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Re: RAT BIKE build (72' CB750K)
« Reply #81 on: July 22, 2015, 06:29:23 PM »
Version 2.0
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1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"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)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline zekd

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Re: RAT BIKE build (72' CB750K)
« Reply #82 on: July 23, 2015, 06:20:40 AM »
Quote from: srizzors25 on July 22, 2015, 01:46:21 PM
Awesome!  You are doing a few things I really want to do with one down the line here.  Are you trying to run a 160 on the back?  Can't tell what size that is.  What are you doing to the rear swingarm? 

Looking awesome though.  Handful of cognitomoto parts up front?

Yup, I'm running a 160/60/17 in the back and 120/70/17 on the front. I swapped the old swing arm out and put a 550 one on. I always hated the stamped steel looking swing arms on the 750's so thats why I went with a 550 for the tubular look to match the frame.

and yes, there are a bunch of cognitomoto parts up front with more to come. My wallet is hurting.
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Offline MessnerMoto

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Re: RAT BIKE build (72' CB750K)
« Reply #83 on: July 23, 2015, 09:48:40 AM »
Quote from: zekd on July 23, 2015, 06:20:40 AM
Quote from: srizzors25 on July 22, 2015, 01:46:21 PM
Awesome!  You are doing a few things I really want to do with one down the line here.  Are you trying to run a 160 on the back?  Can't tell what size that is.  What are you doing to the rear swingarm? 

Looking awesome though.  Handful of cognitomoto parts up front?

Yup, I'm running a 160/60/17 in the back and 120/70/17 on the front. I swapped the old swing arm out and put a 550 one on. I always hated the stamped steel looking swing arms on the 750's so thats why I went with a 550 for the tubular look to match the frame.

and yes, there are a bunch of cognitomoto parts up front with more to come. My wallet is hurting.

Yep tubular steel swing arm looks way better. I will be using swing arm from 1981 DOHC model....
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Offline srizzors25

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Re: RAT BIKE build (72' CB750K)
« Reply #84 on: July 24, 2015, 09:10:25 AM »
Thanks for the reply!  They really do have nice looking stuff but it does break the bank a little.  my understanding is that at its core you really only need the modified stem and bearings for it to be "plug and play" with a modern front end?  The oem modern sportbike front triple clamps and the like still work? 

What wheel are you running on the rear?  I read a honda f3 cbr wheel has the same axle diameter, just need custom spacers.  Did you have to modify the swingarm at all?

also sorry for all the questions really trying to load up on as much info as I can before I start :D
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Offline zekd

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Re: RAT BIKE build (72' CB750K)
« Reply #85 on: July 24, 2015, 10:29:46 AM »
Quote from: srizzors25 on July 24, 2015, 09:10:25 AM
Thanks for the reply!  They really do have nice looking stuff but it does break the bank a little.  my understanding is that at its core you really only need the modified stem and bearings for it to be "plug and play" with a modern front end?  The oem modern sportbike front triple clamps and the like still work? 

What wheel are you running on the rear?  I read a honda f3 cbr wheel has the same axle diameter, just need custom spacers.  Did you have to modify the swingarm at all?

also sorry for all the questions really trying to load up on as much info as I can before I start :D

I'm putting a 17x4.25 on the rear. Ill be able to run modern sport bike tires on it. On the front theres going to be a 17x3.5 wheel. I wanted them to mach so I had to go big and my bank is hurting right now  ;D and for the swing arm, I bought it off ebay for 12$ and just swapped it with no problems at all. It fit perfectly and quickly changed the look of the rear.
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Offline SOHC4 Cafe Racer Fan

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Re: RAT BIKE build (72' CB750K)
« Reply #86 on: July 24, 2015, 10:38:38 AM »
Are you sticking with standard foot pegs or swapping to rearsets (since you are using clip-ons).
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1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"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)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline zekd

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Re: RAT BIKE build (72' CB750K)
« Reply #87 on: July 24, 2015, 10:43:41 AM »
Quote from: CB750 Cafe Racer Fan on July 24, 2015, 10:38:38 AM
Are you sticking with standard foot pegs or swapping to rearsets (since you are using clip-ons).

Yes, ill be switching to rear sets once I have the cash for them.
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Offline DustyRags

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Re: RAT BIKE build (72' CB750K)
« Reply #88 on: December 07, 2015, 11:02:39 AM »
Just caught up on this- any news?
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1976 CB550K- sold
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Offline zekd

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Re: RAT BIKE build (72' CB750K)
« Reply #89 on: March 20, 2018, 03:29:46 PM »
3 years later... Wow how this build really got off track from a rat bike. Whoops.
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Offline WhyNot2

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Re: RAT BIKE build (72' CB750K)
« Reply #90 on: March 21, 2018, 02:36:24 AM »
Wow, turned out nice.........can't believe that it has been that long.

You did a good job. Giving me some motivation to get out and work on mine.
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Offline Dads Toy

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Re: RAT BIKE build (72' CB750K)
« Reply #91 on: March 21, 2018, 01:31:52 PM »
Nice bike, great work.
When you swap the front end. Did you have to use the GXR tree or the original? Just trying to figure out how you swap the front end shocks.
Just my .02cents. but I would relocate that licenses plate to the lower left side of the back wheel.
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Offline zekd

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Re: RAT BIKE build (72' CB750K)
« Reply #92 on: March 21, 2018, 04:24:56 PM »
Cognito Moto makes the conversion tree and steering stem. Pretty simple to put together.

When deciding where to put the plate I originally wanted it down on the side but then realized I needed a place for turn signals and the all in one plate mount was the best solution.
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Offline SKTP

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Re: RAT BIKE build (72' CB750K)
« Reply #93 on: March 21, 2018, 05:21:50 PM »
Looks great!
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1978k rebuild thread http://forums.sohc4.net/index.php?topic=68423.0
BIKE OF THE MONTH - OCTOBER 2017
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