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Author Topic: my first bike build, 1977 CB750K  (Read 6164 times)

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Offline SOHC4 Cafe Racer Fan

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Re: my first bike build, 1977 CB750K
« Reply #25 on: July 16, 2016, 05:01:18 PM »
Sorry to be such a negative nancy about the Firestones.  It's just that you've invested a good chunk of change on a better suspension, brakes and nice wheels.  You'll be fine on straights.  Highway pavement is okay as long as the surface is not rain-grooved -- then it may likely give you a wobbly ride.  Please just be careful!
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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 apope930

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Re: my first bike build, 1977 CB750K
« Reply #26 on: July 16, 2016, 06:39:20 PM »
I understand your concern, I too read all about the firestones before I bought them. I live 10 minutes from work on a straight smooth hwy in a small town with a speed limit of 35mph. I should be fine.


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Offline apope930

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Re: my first bike build, 1977 CB750K
« Reply #27 on: July 22, 2016, 06:55:05 AM »
Mounted my exhaust and headlight yesterday. I ended up sending the carbs to Honda man as the other guy didn't reply to my email.


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Offline apope930

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Re: my first bike build, 1977 CB750K
« Reply #28 on: July 22, 2016, 06:55:23 AM »



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Offline 70CB750

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Re: my first bike build, 1977 CB750K
« Reply #29 on: July 22, 2016, 07:19:00 AM »
Following  :)
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Offline 540nova

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Re: my first bike build, 1977 CB750K
« Reply #30 on: July 22, 2016, 07:43:46 AM »
Quote from: apope930 on July 16, 2016, 06:39:20 PM
I understand your concern, I too read all about the firestones before I bought them. I live 10 minutes from work on a straight smooth hwy in a small town with a speed limit of 35mph. I should be fine.


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So you're building this bike to only ride 10 miles @ 35 mph? C'mon. Lose those tires! Seriously.


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Offline apope930

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Re: my first bike build, 1977 CB750K
« Reply #31 on: July 22, 2016, 08:12:57 AM »
Yep, just to ride around town.


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Offline 540nova

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my first bike build, 1977 CB750K
« Reply #32 on: July 22, 2016, 08:17:34 AM »
Well, I agree about those hipster tires, not suitable for spirited riding. Some Continental Road Attack tires would look and work great. Other than that, great looking bike.


1974 CB450, 2006 CBR1000RR
« Last Edit: July 22, 2016, 08:19:16 AM by 540nova »
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Offline SOHC4 Cafe Racer Fan

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Re: my first bike build, 1977 CB750K
« Reply #33 on: July 22, 2016, 08:35:45 AM »
Do you have an exhaust hanger bracket to help support the weight of the pipe? Your pipe might not seem too heavy, but with riding forces (especially the up and down over surfaces) it will place a lot of strain on the exhaust ports of the head. 
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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 apope930

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Re: my first bike build, 1977 CB750K
« Reply #34 on: July 22, 2016, 09:08:15 AM »
Quote from: CB750 Cafe Racer Fan on July 22, 2016, 08:35:45 AM
Do you have an exhaust hanger bracket to help support the weight of the pipe? Your pipe might not seem too heavy, but with riding forces (especially the up and down over surfaces) it will place a lot of strain on the exhaust ports of the head.

I thought about the same thing, I'll make a bracket that utilizes the clamp holding the megaphone on and just bolt it to the bottom engine mount maybe. Haven't had a chance to sit down and think about all of my options yet.


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1977 CB750K

Offline SOHC4 Cafe Racer Fan

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Re: my first bike build, 1977 CB750K
« Reply #35 on: July 22, 2016, 11:21:32 AM »
Quote from: apope930 on July 22, 2016, 09:08:15 AM
Quote from: CB750 Cafe Racer Fan on July 22, 2016, 08:35:45 AM
Do you have an exhaust hanger bracket to help support the weight of the pipe? Your pipe might not seem too heavy, but with riding forces (especially the up and down over surfaces) it will place a lot of strain on the exhaust ports of the head.

I thought about the same thing, I'll make a bracket that utilizes the clamp holding the megaphone on and just bolt it to the bottom engine mount maybe. Haven't had a chance to sit down and think about all of my options yet.


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Good idea.
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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 apope930

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my first bike build, 1977 CB750K
« Reply #36 on: August 06, 2016, 01:55:34 AM »
Little progress, I finally got the bike out of the woods and into my garage. Dropped the DOHC swing arm off at my machinist to build some bronze bushing to correct the length on the pivot tube. Installed the rear sets. Cleaned up the engine a little. Installed the SS Allen head hardware. Built the oil pressure gauge thing and de-tabbed the rear section of the frame. Also scored a Cognito Moto upper triple tree for $50




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« Last Edit: August 06, 2016, 02:00:46 AM by apope930 »
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Offline apope930

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Re: my first bike build, 1977 CB750K
« Reply #37 on: August 06, 2016, 11:41:03 AM »
Also picked up this seat from dime city cycles. However I personally think it's too narrow for the frame and I'm gonna have a hellva time mounting it.




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Offline SOHC4 Cafe Racer Fan

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Re: my first bike build, 1977 CB750K
« Reply #38 on: August 06, 2016, 12:12:55 PM »
The DCC/Motolanna seat will work just fine on either a 750 or 550.  You can weld tabs onto the frame rails and then bolt your seat into place. 

You can make them or buy them for $20.  http://www.lossaengineering.com/products/lossa-seat-tab-kit
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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 apope930

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Re: my first bike build, 1977 CB750K
« Reply #39 on: August 06, 2016, 12:47:20 PM »
That's what I was hoping for but the bolt holes are centered directly above the frame. I need them to be offset inside the rails and the tabs would work.


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1977 CB750K

Offline SOHC4 Cafe Racer Fan

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Re: my first bike build, 1977 CB750K
« Reply #40 on: August 06, 2016, 02:54:31 PM »
You could drill mounting holes into the frame rails.
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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 apope930

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Re: my first bike build, 1977 CB750K
« Reply #41 on: August 20, 2016, 06:03:27 PM »
So I started to wire up the bike using the simplified wiring diagram however the bike still isn't turning over. Ik my grounds and nice and clean. I am getting 12v out of the teal/red wire going to the neutral safety switch and I think that has something to do with it but I'm a amateur at this. You can see in the factory harness I have arrows pointing to the wire and the diode it ran too that I deleted. Any input on this would be appreciated.
-Allen




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Offline calj737

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Re: my first bike build, 1977 CB750K
« Reply #42 on: August 21, 2016, 04:49:07 AM »
The Neutral Switch and the Clutch Safety switch are both a ground and should not be carrying 12v. Are you using the stock harness, or making a new one from scratch?
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'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline apope930

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Re: my first bike build, 1977 CB750K
« Reply #43 on: August 21, 2016, 05:13:27 AM »
Stripped down the factory harness, the wire I'm inquiring about is bolted directly to the engine with the Phillips head screw pictured above. It is under the transmission cover.


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Offline calj737

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Re: my first bike build, 1977 CB750K
« Reply #44 on: August 21, 2016, 05:24:34 AM »
If its bolted to the engine, then its definitely a "ground" as it should be. That wire serves as the negative connection to the instrument cluster to illuminate the NEU light where a solid BLACK wire is already connected providing power. Also, it was used as the ground on the Clutch Safety switch.

You have apparently crossed it up somewhere with a powered connection. Post a picture of the solenoid wires please. There should be 2 thin wires between the studs where the battery POS and Starter Motor are connected.
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'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis
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