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Author Topic: RAT BIKE build (72' CB750K)  (Read 17771 times)

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Offline zekd

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RAT BIKE build (72' CB750K)
« on: July 15, 2013, 08:24:06 PM »
Hey Everyone!

So we dont see these types of builds really anymore, but recently I aquired a FREE CB750 with a title... (no keys tho  :(  but I can't complain)  I did a bunch of work at a buddies house and as a thank you he gave me his beat up, old, non running, rusty CB750... It was love at first sight... I knew exactly what I was going to do with it. PUT AS LITTLE $$$ INTO IT AS POSSIBLE, and make it look like the most bad ass bike out there. Im only 18 years old and with little money and only a little mechanical experience I think a rat bike would be the best approach to it. I mean c'mon, who doesn't want a bike that you could lean up against a tree or take it down a dirt road and not worry about the shine on their all chromed up bike. So with all that said, WELCOME to my post where ill take you guys down the road of a rat bike build. Thanks, and enjoy!!

So here she is, in all her pride and joy...


Did a full carb rebuild on her. She needed some new lungs! But unfortuannly I used a little too much force when trying to remove one of the float pins and broke the leg that attached to the carb body (whoops!) so now I'm in need of the L1 carb body. IF ANYONE IS PARTING OUT THEIR BIKE OR HAS AN EXTRA SET OF CARBS PLEASE CONTACT ME!! so im still getting the carbs figured out. Such a pain!





I did a custom CHEAP paint job on the bike to get the look I wanted. only 10$ ;D




After a few weeks of work I got her mocked up the way i'd like. Remember, im going for a terribly low budget build. I wanna be able to say " my 300$ piece of.. beauty bike just smoked your 4 grand pretty princess bike. I wouldn't mind some clip ons but I got a free set of clubman bars from a friend who bet them in a game of poker... too easy.


Theres still a bunch of work that needs to get done.. Seat, carbs, tuning and wiring. Then she should be ready to wake the neighbors up!
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Offline SOHC4 Cafe Racer Fan

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Re: RAT BIKE build (72' CB750K)
« Reply #1 on: July 15, 2013, 08:36:53 PM »
I like this build and the bare looking tank. I presume you clear coated it to prevent rust.
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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 #2 on: July 15, 2013, 08:55:30 PM »
Quote from: CB750 Cafe Racer Fan on July 15, 2013, 08:36:53 PM
I like this build and the bare looking tank. I presume you clear coated it to prevent rust.

yessir. just a cheap 1 part spray can clear coat. I just have to watch out for spilling any gas on it.. lol
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Offline SOHC4 Cafe Racer Fan

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Re: RAT BIKE build (72' CB750K)
« Reply #3 on: July 15, 2013, 08:56:45 PM »
I've always like the bare metal tank thing.  Good luck with the project.  I'm look forward to your progress.
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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 #4 on: July 15, 2013, 09:22:53 PM »
Quote from: CB750 Cafe Racer Fan on July 15, 2013, 08:56:45 PM
I've always like the bare metal tank thing.  Good luck with the project.  I'm look forward to your progress.
Yeah, I love the look of it too. Its tricky getting it so it doesn't rust overtime. the more prep work you do and the better clear you use will always help in the long run.
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Offline zekd

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Re: RAT BIKE build (72' CB750K)
« Reply #5 on: July 16, 2013, 06:57:17 PM »
I AM STILL IN NEED OF A CARB BODY. ANYBODY??
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Offline lwahples

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Re: RAT BIKE build (72' CB750K)
« Reply #6 on: July 17, 2013, 03:43:13 AM »
PM sent on the carb.
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Offline zekd

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Re: RAT BIKE build (72' CB750K)
« Reply #7 on: July 17, 2013, 09:37:33 AM »
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Offline zekd

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Re: RAT BIKE build (72' CB750K)
« Reply #8 on: July 18, 2013, 02:36:07 PM »
Just checking in. Finally got the right carb body thanks to lwhaples! Heres a photo from my last ride. Thought it was cool.
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Offline zekd

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Re: RAT BIKE build (72' CB750K)
« Reply #9 on: November 18, 2013, 05:06:41 PM »
About to buy some pod filters and get her running when I am home for break, any suggestions? Will I have to rejet my carbs?
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Offline nccb

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Re: RAT BIKE build (72' CB750K)
« Reply #10 on: November 18, 2013, 05:15:38 PM »
don't get rid of that air box.  if you are going for cheap and you already have it, keep it.   But at the very least, sell it to someone else on the forum.  I have read A LOT of posts of people looking for those air boxes because they or the PO put pods on and trashed the old air box.

I do like the tank as well by the way, I have one sitting in my building I stripped as well 8)
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Offline zekd

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Re: RAT BIKE build (72' CB750K)
« Reply #11 on: November 18, 2013, 05:22:07 PM »
Quote from: nccb on November 18, 2013, 05:15:38 PM
don't get rid of that air box.  if you are going for cheap and you already have it, keep it.   But at the very least, sell it to someone else on the forum.  I have read A LOT of posts of people looking for those air boxes because they or the PO put pods on and trashed the old air box.

I do like the tank as well by the way, I have one sitting in my building I stripped as well 8)

true, my airbox is just very badly warped, I guess ill just have to mess with it and make it work.
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Offline zekd

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Re: RAT BIKE build (72' CB750K)
« Reply #12 on: November 18, 2013, 05:45:38 PM »
I need some aggressive tires for this build, Im not sure what size or where to even look.. any help?
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Offline nccb

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Re: RAT BIKE build (72' CB750K)
« Reply #13 on: November 18, 2013, 06:44:41 PM »
might want to check out Shinko's tires.  They are a cheaper brand but a good bit of guys have been using them on the forum, myself included.  Give them a search in the google search bar of the site.  The 712s (I think - forgot the exact number) are what people seem to be trying on here.  I have about 1000 on the rear and haven't had an issue.  Believe I got it for about 55 bucks.
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Offline lwahples

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Re: RAT BIKE build (72' CB750K)
« Reply #14 on: November 19, 2013, 03:18:18 AM »
Good to see the bike is coming along.Have a warm spot for the winter?
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Offline martin99

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Re: RAT BIKE build (72' CB750K)
« Reply #15 on: November 19, 2013, 01:53:57 PM »
You're 18? Jeez, my 18yr old doesn't know a screwdriver from a hammer. Good on yer, mate! Watching with interest :)
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Build threads:
77 750F2 Refresh Project http://forums.sohc4.net/index.php?topic=144075.0
TRIBSA http://forums.sohc4.net/index.php/topic,160296.0.html

1977 CB750 F2
1958 Norton Model 99
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Offline CBcafeJunkie

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Re: RAT BIKE build (72' CB750K)
« Reply #16 on: November 22, 2013, 07:15:57 PM »
  Looking great and love the tank! If you need any help with the electrics I just went through mine. I found some awesome solutions really cheap for a regulator rectifier you can make yourself from an auto parts store super easy super inexpensive.  keep us updated
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Offline DustyRags

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Re: RAT BIKE build (72' CB750K)
« Reply #17 on: November 23, 2013, 10:15:43 AM »
Great looking start, in for the haul! Got a manual for that beauty?
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1976 CB550K- sold
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1975 XL350 - crashed
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Offline zekd

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Re: RAT BIKE build (72' CB750K)
« Reply #18 on: November 24, 2013, 08:40:27 PM »
So this past weekend I got pretty far on the bike, I fixed my carb problems, ignition coil problem, installed a new wiring harness, and I did some cutting to the frame, Cut about 15 pounds off the bike. I took it out for a test ride around my neighborhood and lets just say that the 4 into 1 exhaust is insane, I woke up everyone. Its incredible how much more power is there now that I cut the frame and cleaned the carbs.

My next move is focusing on the gas tank. I had to re clear coat it because the first time I just used a cheap can of clear coat, I then got a paint gun so I'm going to use a 2 part to make it more durable and the clear wont get eaten away by gas and other corrosive materials.

I'm also fabricating a custom latch for my gas tank that secures it to the frame. I used 1/4 in steel rod and made my own custom jig for bending the rod into the desired shape, It took some time and planning but I think its going to turn out very nice. Im using an old navy belt for the strap, the leather will match the seat. It should look pretty sweet.

Don't mind the drawing on the tank. My friends decided to use it as a notebook!


72' CB750 by zekd, on Flickr


72' CB750 by zekd, on Flickr


72' CB750 by zekd, on Flickr

Heres where she sits now. Got all the wiring cleaned up and back in the bucket. Man, wiring is one big b*tch


72' CB750 by zekd, on Flickr

I also appreciate all the intrests you guys have in my build. Im not anywhere near a professional mechanic. I am learning as I go so please bare with me!

Lastly, I am trying to think of ways to fabricate a rear loop for my bike. I got have a pipe bender so I dont know what to do. Would anyone be willing to get some business by bending me some steel? Please let me know if you would be willing to and let me know the price.
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Offline CBcafeJunkie

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Re: RAT BIKE build (72' CB750K)
« Reply #19 on: November 24, 2013, 11:04:20 PM »
searching ebay or dime city cycles you can get a hoop for up to $70 (have seen them for $50) i know that is probably not in line with what you want to do, but also you tube and google pipe bending. might turn up something.
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Offline zekd

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Re: RAT BIKE build (72' CB750K)
« Reply #20 on: November 25, 2013, 06:49:57 AM »
Quote from: CBcafeJunkie on November 24, 2013, 11:04:20 PM
searching ebay or dime city cycles you can get a hoop for up to $70 (have seen them for $50) i know that is probably not in line with what you want to do, but also you tube and google pipe bending. might turn up something.

I'm afraid that it wont match the contour of my seat well. Im looking tho!
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Offline CBcafeJunkie

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RAT BIKE build (72' CB750K)
« Reply #21 on: November 25, 2013, 06:54:11 AM »
Are you making your seat?
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Offline DustyRags

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Re: RAT BIKE build (72' CB750K)
« Reply #22 on: November 25, 2013, 08:29:05 AM »
What's the idea behind the strap on there?

And whoever drew that stussy needs to be informed that the 90's have ended. ;)
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1976 CB550K- sold
2005 Kawasaki Vulcan 500- sold
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1975 XL350 - crashed
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Offline zekd

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Re: RAT BIKE build (72' CB750K)
« Reply #23 on: November 25, 2013, 06:29:10 PM »
Quote from: CBcafeJunkie on November 25, 2013, 06:54:11 AM
Are you making your seat?
Nope, I already had one from a previous build. Its a flat style seat with a little up curve at the end.

Quote from: DustyRags on November 25, 2013, 08:29:05 AM
What's the idea behind the strap on there?

And whoever drew that stussy needs to be informed that the 90's have ended. ;)
I can thank my friends for that. I mean, we were all born in the 90's ;D The strap is for looks and it will be used to secure the gas tank.
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Offline zekd

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Re: RAT BIKE build (72' CB750K)
« Reply #24 on: November 25, 2013, 06:31:22 PM »
Heres a picture from the test ride earlier!


Untitled by zekd, on Flickr
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