Author Topic: 1972 CB750K2 (start from scratch) project. Cases back together  (Read 99501 times)

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Offline Davez134

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Re: 1972 CB750K2 (start from scratch) project. Small leak!!! Damn!
« Reply #25 on: August 26, 2014, 10:37:42 AM »
Well, just got an email back from Mike R. yesterday stating he thinks my head is not even worth trying to repair for a few reasons. Now to try and find another one.

Offline edwardmorris

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Re: 1972 CB750K2 (start from scratch) project. Small leak!!! Damn!
« Reply #26 on: August 26, 2014, 10:58:51 AM »
That sucks. I'd ping Bill Benton, have him find a good one and ship it straight to Mike Reick...

Offline Davez134

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Re: 1972 CB750K2 (start from scratch) project. Small leak!!! Damn!
« Reply #27 on: August 30, 2014, 09:02:32 AM »

Got this in the mail today! Can get this done while I'm waiting on cylinder head. Wow this is such a great quality kit!


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Offline SOHC4 Cafe Racer Fan

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Re: 1972 CB750K2 (start from scratch) project. Small leak!!! Damn!
« Reply #28 on: August 30, 2014, 10:30:06 AM »
Well, just got an email back from Mike R. yesterday stating he thinks my head is not even worth trying to repair for a few reasons. Now to try and find another one.

I know how that is.  On the 750 I am working on, the head I sent him was too roached to repair. :( Mike hooked me up with a replacement AND a killer stage 4 job.
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 Davez134

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Re: 1972 CB750K2 (start from scratch) project. Small leak!!! Damn!
« Reply #29 on: August 30, 2014, 10:41:07 AM »
Well, just got an email back from Mike R. yesterday stating he thinks my head is not even worth trying to repair for a few reasons. Now to try and find another one.

I know how that is.  On the 750 I am working on, the head I sent him was too roached to repair. :( Mike hooked me up with a replacement AND a killer stage 4 job.

He just got back to me that he found a replacement head for mine. I know I shouldn't be, but I am still surprised by the half-assed dumb #$%* people do to "fix" something and ruin it for any future owner! Oh well, it will be right now.

Offline Davez134

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Re: 1972 CB750K2 (start from scratch) project. Small leak!!! Damn!
« Reply #30 on: August 30, 2014, 10:45:20 AM »
Also in the mail the other day, fork tube lowers, alternator/coil, fork lowers and springs from seanbarney41. Thanks again! Now on to polishing. Hopefully as good as edwardmorris.

Offline edwardmorris

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Re: 1972 CB750K2 (start from scratch) project. Small leak!!! Damn!
« Reply #31 on: August 30, 2014, 02:57:47 PM »
Also in the mail the other day, fork tube lowers, alternator/coil, fork lowers and springs from seanbarney41. Thanks again! Now on to polishing. Hopefully as good as edwardmorris.
HA! Thanks. Though now that I'm done with it, I won't do it again. 73Nancy/Ryan charges $120 (I think) for fork lowers, which I think is a steal. That is what I'd charge just to clean the mess in my shop after days of sanding and hours of buffing that I did to get a reasonable finish on them.

Offline SOHC4 Cafe Racer Fan

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Re: 1972 CB750K2 (start from scratch) project. Small leak!!! Damn!
« Reply #32 on: August 30, 2014, 03:15:08 PM »
Also in the mail the other day, fork tube lowers, alternator/coil, fork lowers and springs from seanbarney41. Thanks again! Now on to polishing. Hopefully as good as edwardmorris.
HA! Thanks. Though now that I'm done with it, I won't do it again. 73Nancy/Ryan charges $120 (I think) for fork lowers, which I think is a steal. That is what I'd charge just to clean the mess in my shop after days of sanding and hours of buffing that I did to get a reasonable finish on them.

I just got a pair of fork lowers high polished to a mirror-like finish for $40.  That was a steal.  And they were highly oxidized.
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 edwardmorris

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Re: 1972 CB750K2 (start from scratch) project. Small leak!!! Damn!
« Reply #33 on: August 30, 2014, 05:28:38 PM »
Also in the mail the other day, fork tube lowers, alternator/coil, fork lowers and springs from seanbarney41. Thanks again! Now on to polishing. Hopefully as good as edwardmorris.
HA! Thanks. Though now that I'm done with it, I won't do it again. 73Nancy/Ryan charges $120 (I think) for fork lowers, which I think is a steal. That is what I'd charge just to clean the mess in my shop after days of sanding and hours of buffing that I did to get a reasonable finish on them.

I just got a pair of fork lowers high polished to a mirror-like finish for $40.  That was a steal.  And they were highly oxidized.
Sure is, where did you get them done? Compared to Browns, Ryan's prices are amazing, but $40 forfork legs is incredible.

Offline Davez134

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Re: 1972 CB750K2 (start from scratch) project. Small leak!!! Damn!
« Reply #34 on: August 30, 2014, 05:50:19 PM »
I'm going to try myself first and see if I can learn something. Fingers crossed

Offline SOHC4 Cafe Racer Fan

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Re: 1972 CB750K2 (start from scratch) project. Small leak!!! Damn!
« Reply #35 on: August 30, 2014, 06:10:56 PM »
Also in the mail the other day, fork tube lowers, alternator/coil, fork lowers and springs from seanbarney41. Thanks again! Now on to polishing. Hopefully as good as edwardmorris.
HA! Thanks. Though now that I'm done with it, I won't do it again. 73Nancy/Ryan charges $120 (I think) for fork lowers, which I think is a steal. That is what I'd charge just to clean the mess in my shop after days of sanding and hours of buffing that I did to get a reasonable finish on them.

My painter has the hook up.  Some guys that do polishing for him.  I just dropped them off looking oxidized and WHAMMO, got them back all shiny and bright.  I know I "cheated" but it beat the heck out of blistered fingers the last time I did it.

I just got a pair of fork lowers high polished to a mirror-like finish for $40.  That was a steal.  And they were highly oxidized.
Sure is, where did you get them done? Compared to Browns, Ryan's prices are amazing, but $40 forfork legs is incredible.
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 Davez134

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Re: 1972 CB750K2 (start from scratch) project. Small leak!!! Damn!
« Reply #36 on: August 31, 2014, 05:19:00 PM »
Started frame kit today.

Measured and taped.

I used zip ties to trace a straight line around the frame tubes then slid out of the way and cut.




Mocked it up, started to tack weld it, then ran out of wire

Will finish later this week


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Offline Davez134

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Re: 1972 CB750K2 (start from scratch) project. Small leak!!! Damn!
« Reply #37 on: September 02, 2014, 08:36:01 PM »
Frame kit mostly done. Going to really finish sand and smooth soon.







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Offline Davez134

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Re: 1972 CB750K2 (start from scratch) project. Small leak!!! Damn!
« Reply #38 on: September 08, 2014, 10:08:46 AM »
Trying to keep things moving, working on what I have while waiting for cylinder head to be done. Got a complete rack of carbs last year with brand new rubber boots. (086A) started polishing bowls/ tops, soda blasting bodies.


Also, found a solution to broken fins on cylinder head. I put out a message to my friends on Facebook looking for recommendations for a good aluminum welder to fix fins. My friend showed up at my door with this...

Said I could have it, bought it by mistake for his F bike. Lucky day!


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Re: 1972 CB750K2 (start from scratch) project. Small leak!!! Damn!
« Reply #39 on: September 08, 2014, 10:23:09 AM »
That's a nice friend!
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 Davez134

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Re: 1972 CB750K2 (start from scratch) project. Small leak!!! Damn!
« Reply #40 on: September 08, 2014, 12:06:20 PM »
1 carb body done, 3 to go. Also all jets/passages perfectly clean! Happy with this one.
Before

Now



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Offline SOHC4 Cafe Racer Fan

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Re: 1972 CB750K2 (start from scratch) project. Small leak!!! Damn!
« Reply #41 on: September 08, 2014, 02:45:52 PM »
Nicely done.  Want to tackle my 650 carbs?  ;)
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 edwardmorris

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Re: 1972 CB750K2 (start from scratch) project. Small leak!!! Damn!
« Reply #42 on: September 08, 2014, 02:52:25 PM »
I've been dallying the bowls and tappet covers, did you end up sanding the bowls or just hit them directly with the buffer? They look nice!

Offline calj737

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Re: 1972 CB750K2 (start from scratch) project. Small leak!!! Damn!
« Reply #43 on: September 08, 2014, 03:30:06 PM »
Nicely done.  Want to tackle my 650 carbs?  ;)
Grab that dual carb setup thru Devin, CB. 2 brand new Mikunis!
'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 SOHC4 Cafe Racer Fan

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Re: 1972 CB750K2 (start from scratch) project. Small leak!!! Damn!
« Reply #44 on: September 08, 2014, 03:37:20 PM »
Devin's listing twin Mikuni carburetors for twin motors, but I didn't see any 2-1 manifolds similar to the Cycle X set up.  I must be blind. 
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 Davez134

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Re: 1972 CB750K2 (start from scratch) project. Small leak!!! Damn!
« Reply #45 on: September 08, 2014, 04:18:16 PM »
Nicely done.  Want to tackle my 650 carbs?  ;)
I barely wanna to these! Haha

Offline Davez134

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Re: 1972 CB750K2 (start from scratch) project. Small leak!!! Damn!
« Reply #46 on: September 08, 2014, 04:21:14 PM »
I've been dallying the bowls and tappet covers, did you end up sanding the bowls or just hit them directly with the buffer? They look nice!
I had to sand the bowls. Tried just buffing, but no go. They are pretty bad in person, needed to get some mild pitting out with sandpaper.

Offline Davez134

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Re: 1972 CB750K2 (start from scratch) project. Small leak!!! Damn!
« Reply #47 on: September 18, 2014, 09:07:54 AM »
Collecting parts as I come across them. Got a complete rear hub, great condition, that I just need to clean up a bit. Also got this original seat in the mail today. This thing is sooo clean. Very happy





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Offline SOHC4 Cafe Racer Fan

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Re: 1972 CB750K2 (start from scratch) project. Small leak!!! Damn!
« Reply #48 on: September 18, 2014, 11:27:46 AM »
That seat looks NOS.  Very nice 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

Offline Davez134

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Re: 1972 CB750K2 (start from scratch) project. Small leak!!! Damn!
« Reply #49 on: September 18, 2014, 12:46:56 PM »
That seat looks NOS.  Very nice score!
Thanks! I was thinking about buying a repro until I found this one. Nice being able to take my time and wait to find what I really want. Since I already have a daily rider I don't feel rushed.