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Author Topic: 1973 cb750 Project "Blackout" slow but steady  (Read 1536 times)

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Offline TheCampingPost

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1973 cb750 Project "Blackout" slow but steady
« on: May 18, 2015, 11:42:54 AM »
I'm 17 got this cb750 in a trade trying out a cafe style build, and the guy did a lot of motor work apparently including an engine swap so really don't know how many miles there are on the motor but it's pretty clean when I took the valve cover off. He extended the swingarm and lowered the bike by taking the springs in the back out and just puting a spacer, but everything is being taken off and being fixed or replaced. Looking for advice on what to look for or what to replace to make this more reliable and economic. What are any to all problems with this bike that can be fixed. Some background: I've been working on and fixing things with motors since I was 10 or 11 built a model car when I was 4 and since then I've loved building things I live in monrovia California about 30 minutes east of Los Angeles. This is going to be a pretty low budget build. Thanks for reading and thanks for replying. I have an Instagram setup just for this build that will have lots of photo updates probably day by day https://instagram.com/projectblackoutcb750/
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I'm 17 and I have absolutely no clue what I'm doing.
1973 cb750  Project "Blackout"
"Do What You Can, With What You Have, Where You Are" – Teddy Roosevelt.

Current Projects
1973 cb750
1984 cb700sc
My Instagram is just small current updates made day by day
https://instagram.com/projectblackoutcb750/

Offline SOHC4 Cafe Racer Fan

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Re: 1973 cb750 Project "Blackout" slow but steady
« Reply #1 on: May 18, 2015, 12:39:50 PM »
Is the motor seized or free.  If free, you should try giving it a major service and seeing if it will run.  This will most assuredly require rebuilding the carburetors if they have been sitting for an appreciable amount of time.  The motor does not look too crusty and has some aftermarket pieces.  I would then go through it system by system (forks, brakes, shocks, electrical).  See if you can get it into a running bike before you start converting it to a café.  The time spent getting it into running shape will give you a chance to get to know what you like or don't like about the bike to modify later.
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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 TheCampingPost

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Re: 1973 cb750 Project "Blackout" slow but steady
« Reply #2 on: May 18, 2015, 02:48:58 PM »
The motor is not seized (anymore) very light rust in one cylinder. I already took apart all of the carbs need a few small parts in them. Here's what I've done so far. I know it's a mess but I learn where everything goes 
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I'm 17 and I have absolutely no clue what I'm doing.
1973 cb750  Project "Blackout"
"Do What You Can, With What You Have, Where You Are" – Teddy Roosevelt.

Current Projects
1973 cb750
1984 cb700sc
My Instagram is just small current updates made day by day
https://instagram.com/projectblackoutcb750/

Offline SOHC4 Cafe Racer Fan

  • Speak up, Whipper-Snapper! I'm a
  • Really Old Timer ...
  • *******
  • Posts: 15,731
  • SOHC/4 Member #1235
Re: 1973 cb750 Project "Blackout" slow but steady
« Reply #3 on: May 18, 2015, 04:28:09 PM »
Well, so much for taking the teardown in steps!  ;)

What do you plan on tackling first?
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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 TheCampingPost

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  • Posts: 7
Re: 1973 cb750 Project "Blackout" slow but steady
« Reply #4 on: May 18, 2015, 08:17:51 PM »
Cleaning and painting since my dad can get parts powder coated very cheap at work. But before while iver urging is dirty I'll try starting it
Logged
I'm 17 and I have absolutely no clue what I'm doing.
1973 cb750  Project "Blackout"
"Do What You Can, With What You Have, Where You Are" – Teddy Roosevelt.

Current Projects
1973 cb750
1984 cb700sc
My Instagram is just small current updates made day by day
https://instagram.com/projectblackoutcb750/

Offline SOHC4 Cafe Racer Fan

  • Speak up, Whipper-Snapper! I'm a
  • Really Old Timer ...
  • *******
  • Posts: 15,731
  • SOHC/4 Member #1235
Re: 1973 cb750 Project "Blackout" slow but steady
« Reply #5 on: May 18, 2015, 09:43:59 PM »
Quote from: TheCampingPost on May 18, 2015, 08:17:51 PM
Cleaning and painting since my dad can get parts powder coated very cheap at work. But before while iver urging is dirty I'll try starting it

That's definitely an incentive!
Logged
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
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