Author Topic: 1976 CB750 Build guidance please.  (Read 3129 times)

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Offline Hotwheelbill

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1976 CB750 Build guidance please.
« on: June 08, 2015, 01:47:45 PM »
So, I was given this 1976 (11/75 build date) CB750. Complete but dropped on left side and poor patch on engine cover....fix that later. Last ran 2 yrs ago and before that several yrs. Tank looks nice outside, inside has a bad Kreem fix attempt. All in the bottom now. Carbs are stuck open, cable maybe. It does turn freely. 10873 miles.
So, Am I right in my thinking......
1) Pull and rebuild carbs.
2) Tank tank to rad. shop and have them strip and fix leaks in tank. (paint is no good anyway).
3) Go ahead and order Dyna electonic ignition , coils, wires and be done with that! If all else, I keep for another day.
4) Fire it up and then go to town with the tear down.

I have never had even a head off of a bike. I am sure I can, but have not as of today. Oh, wait, there was that DR650......LETS MOVE ON!
So, I would think with a bit of seafoam and new oil changes a few times in few hours of running would be ok for a 10k motor that has been ...kind of sealed up. 
Fire away!
« Last Edit: June 09, 2015, 04:38:41 AM by Hotwheelbill »
I love to make my bikes worthless due to high mileage!
2004 ST1300A .... the fast one. And dragging pegs on a CT.
1972…parts bike
1974…. Rusty frame but runs
1974 CB750..... Powder coated frame and parts, waiting for $$ hot rod motor.
1972 with 1975 old school drag motor

Offline Davez134

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Re: 1976 CB750 Build guidance please.
« Reply #1 on: June 08, 2015, 03:09:46 PM »
Absolutely completely clean carbs and get that tank cleaned out, great first choices. My suggestion is before you spend the money on all that ignition stuff, test what is on there now, do the tune up procedure per shop manual available here and see how she runs. My guess is if it was sealed up, no water got in anywhere and that low mileage, it should run good. But, get it running good then decide what you want to "upgrade."

Offline calj737

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Re: 1976 CB750 Build guidance please.
« Reply #2 on: June 08, 2015, 05:49:22 PM »
And you don't need to take the tank to a radiator shop, Acetone or MEK will strip that liner out lickety-split!
'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 HondaMan

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Re: 1976 CB750 Build guidance please.
« Reply #3 on: June 08, 2015, 06:52:16 PM »
If you
So, I was given this 1976 (11/75 build date) CB750. Complete but dropped on left side and poor patch on engine cover....fix that later. Last ran 2 yrs ago and before that several yrs. Tank looks nice outside, inside has a bad Kreem fix attempt. All in the bottom now. Carbs are stuck open, cable maybe. It does turn freely. 10873 miles.
So, Am I right in my thinking......
1) Pull and rebuild carbs.
2) Tank tank to rad. shop and have them strip and fix leaks in tank. (paint is no good anyway).
3) Go ahead and order Dyna electonic ignition , coils, wires and be done with that! If all else, I keep for another day.
4) Fire it up and then go to town with the tear down.

I have never had even a head off of a bike. I am sure I can, but have not as of today. Oh, wait, there was that KLR650......LETS MOVE ON!
So, I would think with a bit of seafoam and new oil changes a few times in few hours of running would be ok for a 10k motor that has been ...kind of sealed up. 
Fire away!

If you get Dyna coils with their Dyna S ignition, get their 5-ohm coils. Using their 3-ohm coils and the Dyna S together will ensure that your battery will always be 2/3 charged, and the electric start won't work. Also, don't forget to also buy new sparkplug caps in the 5000 ohm (5K) type, part numbers SD05F and VD05F. I recommend the ND sparkplugs #X24ES-U with that bike, too. ;)
See SOHC4shop@gmail.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book

Link to website: www.SOHC4shop.com

Offline seanbarney41

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Re: 1976 CB750 Build guidance please.
« Reply #4 on: June 08, 2015, 07:43:59 PM »
100%...just fix what needs it and run that engine.  Especially considering that you are inexperienced....these engines are not cheap or easy to rebuild.
If it works good, it looks good...

Offline Hotwheelbill

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Re: 1976 CB750 Build guidance please.
« Reply #5 on: June 09, 2015, 04:32:09 AM »
Thanks everone for some good advice.
I will am going to cut my CB650 build short after the carbs are rebuilt and sell to fund this one. So, I will prob go ahead with the Dyna and if it all goes to s@@@ I will shelf it for the next...CB750.
Hondaman, thank you for your advice and will do!
I may do the tank myself, but told it has a leak and that was why the Kreem was used.
Month or so away, so many questions to come.
I love to make my bikes worthless due to high mileage!
2004 ST1300A .... the fast one. And dragging pegs on a CT.
1972…parts bike
1974…. Rusty frame but runs
1974 CB750..... Powder coated frame and parts, waiting for $$ hot rod motor.
1972 with 1975 old school drag motor

Offline 70CB750

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Dorothy - my CB750
CB750K3F - The Red
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2006 KLR650

Offline Hotwheelbill

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Re: 1976 CB750 Build guidance please.
« Reply #7 on: June 09, 2015, 04:44:41 AM »
I love to make my bikes worthless due to high mileage!
2004 ST1300A .... the fast one. And dragging pegs on a CT.
1972…parts bike
1974…. Rusty frame but runs
1974 CB750..... Powder coated frame and parts, waiting for $$ hot rod motor.
1972 with 1975 old school drag motor

Offline Hotwheelbill

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Re: 1976 CB750 Build guidance please.
« Reply #8 on: June 12, 2015, 11:14:54 AM »
ftp://Did not plan on this so soon, but for $350 , Im going to get it in a few.  2004 GSXR 600 FRONT END.
I love to make my bikes worthless due to high mileage!
2004 ST1300A .... the fast one. And dragging pegs on a CT.
1972…parts bike
1974…. Rusty frame but runs
1974 CB750..... Powder coated frame and parts, waiting for $$ hot rod motor.
1972 with 1975 old school drag motor

Offline SOHC4 Cafe Racer Fan

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Re: 1976 CB750 Build guidance please.
« Reply #9 on: June 12, 2015, 12:23:49 PM »
Nice donor front.  Stock GSXR wheels or an adapted spoke wheel from a Cognitomoto hub or machined spacers?
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 Hotwheelbill

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Re: 1976 CB750 Build guidance please.
« Reply #10 on: June 12, 2015, 12:45:05 PM »
Nice donor front.  Stock GSXR wheels or an adapted spoke wheel from a Cognitomoto hub or machined spacers?

Not a clue.  A little too soon for this item, but it comes with brakes , wheel , fender, bars....My just start with this wheel for now. Well the rear wheel from a GSXR600 work on the CB750?
I love to make my bikes worthless due to high mileage!
2004 ST1300A .... the fast one. And dragging pegs on a CT.
1972…parts bike
1974…. Rusty frame but runs
1974 CB750..... Powder coated frame and parts, waiting for $$ hot rod motor.
1972 with 1975 old school drag motor

Offline Hotwheelbill

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Re: 1976 CB750 Build guidance please.
« Reply #11 on: June 12, 2015, 12:47:52 PM »
Nice donor front.  Stock GSXR wheels or an adapted spoke wheel from a Cognitomoto hub or machined spacers?
Also, anything else I can use off this bike while Im there? shifter, brake??
I love to make my bikes worthless due to high mileage!
2004 ST1300A .... the fast one. And dragging pegs on a CT.
1972…parts bike
1974…. Rusty frame but runs
1974 CB750..... Powder coated frame and parts, waiting for $$ hot rod motor.
1972 with 1975 old school drag motor

Offline SOHC4 Cafe Racer Fan

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Re: 1976 CB750 Build guidance please.
« Reply #12 on: June 12, 2015, 01:32:40 PM »
Steering damper and possibly the rear sets (I have seen people weld mounting brackets to adapt them to fit).
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 calj737

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Re: 1976 CB750 Build guidance please.
« Reply #13 on: June 12, 2015, 08:29:35 PM »
Nice donor front.  Stock GSXR wheels or an adapted spoke wheel from a Cognitomoto hub or machined spacers?

Not a clue.  A little too soon for this item, but it comes with brakes , wheel , fender, bars....My just start with this wheel for now. Well the rear wheel from a GSXR600 work on the CB750?
With a little work, you can adapt the rear swing arm and stock gsxr wheel to the rear, and the entire front end (swap the steering stem) onto the CB. If you desire-
'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 Hotwheelbill

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Re: 1976 CB750 Build guidance please.
« Reply #14 on: June 13, 2015, 04:43:53 AM »
Nice donor front.  Stock GSXR wheels or an adapted spoke wheel from a Cognitomoto hub or machined spacers?

Not a clue.  A little too soon for this item, but it comes with brakes , wheel , fender, bars....My just start with this wheel for now. Well the rear wheel from a GSXR600 work on the CB750?
With a little work, you can adapt the rear swing arm and stock gsxr wheel to the rear, and the entire front end (swap the steering stem) onto the CB. If you desire-
Thanks guys for the info/input. I will use the new shaft for front end swap. Not real crazy about the rear GSXR swing arm. So, looking at a CBR rim mayby with a CB550 arm.
I love to make my bikes worthless due to high mileage!
2004 ST1300A .... the fast one. And dragging pegs on a CT.
1972…parts bike
1974…. Rusty frame but runs
1974 CB750..... Powder coated frame and parts, waiting for $$ hot rod motor.
1972 with 1975 old school drag motor

Offline Hotwheelbill

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Re: 1976 CB750 Build guidance please.
« Reply #15 on: June 13, 2015, 04:45:40 AM »
BTY, did not go to pick it up yesterday. Seller is pulling it today and going to call me. Better pics later.
I love to make my bikes worthless due to high mileage!
2004 ST1300A .... the fast one. And dragging pegs on a CT.
1972…parts bike
1974…. Rusty frame but runs
1974 CB750..... Powder coated frame and parts, waiting for $$ hot rod motor.
1972 with 1975 old school drag motor

Offline calj737

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Re: 1976 CB750 Build guidance please.
« Reply #16 on: June 13, 2015, 06:16:47 AM »
Wish I had known yesterday you might want a 550 arm. I have an extra, and I drove to FL last night. I could have delivered it to you today  :-[

If you do use a 550 arm (it's a good idea on a 750 because they're at least 1" longer) the only trick will be to insure the gsxr axle and 550 hub are compatible. And of course the sprocket on the drive side will need to align with the front (perhaps a slightly custom width axle spacer). I like your plan. And of course, a caliper bracket on the brake side needs to be fashioned for the tie to the swing arm.
'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 Hotwheelbill

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Re: 1976 CB750 Build guidance please.
« Reply #17 on: June 13, 2015, 06:54:03 AM »
Wish I had known yesterday you might want a 550 arm. I have an extra, and I drove to FL last night. I could have delivered it to you today  :-[

If you do use a 550 arm (it's a good idea on a 750 because they're at least 1" longer) the only trick will be to insure the gsxr axle and 550 hub are compatible. And of course the sprocket on the drive side will need to align with the front (perhaps a slightly custom width axle spacer). I like your plan. And of course, a caliper bracket on the brake side needs to be fashioned for the tie to the swing arm.

Auh man. Yeah would have been nice.
Thanks.
I still need to clean carbs and get her fired up....soon.
I love to make my bikes worthless due to high mileage!
2004 ST1300A .... the fast one. And dragging pegs on a CT.
1972…parts bike
1974…. Rusty frame but runs
1974 CB750..... Powder coated frame and parts, waiting for $$ hot rod motor.
1972 with 1975 old school drag motor

Offline Hotwheelbill

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Re: 1976 CB750 Build guidance please.
« Reply #18 on: June 14, 2015, 01:45:58 PM »
Question.
In looking for a frame with a title for my 1976 CB750K, I have come across a 77 Hondamatic frame about 3 hours away. Any reasons to use/not use, this frame?
I love to make my bikes worthless due to high mileage!
2004 ST1300A .... the fast one. And dragging pegs on a CT.
1972…parts bike
1974…. Rusty frame but runs
1974 CB750..... Powder coated frame and parts, waiting for $$ hot rod motor.
1972 with 1975 old school drag motor

Offline calj737

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Re: 1976 CB750 Build guidance please.
« Reply #19 on: June 14, 2015, 02:32:03 PM »
Over in the For Sale section, jsedacca is selling a bunch of 750 stuff. I was by his place this am and noticed a frame. Maybe contact him? He's in Tampa area
'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 Hotwheelbill

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Re: 1976 CB750 Build guidance please.
« Reply #20 on: June 15, 2015, 03:12:57 PM »
Picked it up today. Less a couple things, but still good for price.
I love to make my bikes worthless due to high mileage!
2004 ST1300A .... the fast one. And dragging pegs on a CT.
1972…parts bike
1974…. Rusty frame but runs
1974 CB750..... Powder coated frame and parts, waiting for $$ hot rod motor.
1972 with 1975 old school drag motor

Offline SOHC4 Cafe Racer Fan

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Re: 1976 CB750 Build guidance please.
« Reply #21 on: June 15, 2015, 03:18:11 PM »
That front looks relatively clean and you got the brakes too. Score.
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