« previous next »
Pages: 1 ... 19 20 [21] 22 23   Go Down

Author Topic: 1972 CB750K2 (start from scratch) project. Cases back together  (Read 102043 times)

0 Members and 1 Guest are viewing this topic.

Offline Davez134

  • Expert
  • ****
  • Posts: 1,485
Re: 1972 CB750K2 (start from scratch) project.
« Reply #500 on: October 26, 2016, 06:25:31 PM »
Quote from: moraarcher on October 25, 2016, 08:37:17 PM
Very impressed, what a beautiful bike. Just showed the pictures to my wife and said I'd like to something like that someday. She said it looked great and if that's what I wanted to do go ahead. That's my opening and now I'm on the hunt. I still have some things to finish on my '72 750.
Once again nice job on the bike and the write up.

Thanks for the kind words! Glad I can give some inspiration, and facilitate the go-ahead from the boss
Logged

Offline Davez134

  • Expert
  • ****
  • Posts: 1,485
1972 CB750K2 (start from scratch) project.
« Reply #501 on: January 12, 2017, 05:49:31 PM »
So I'm getting some things done this winter while it's cold out. First of all, I was leaking oil past a couple valve seals. I replaced The seals, but the leak came back. Most likely because the bronze guides are worn. They are being replaced with cast iron guides, valve job, new seals. Second, against my better judgement, I am splitting the cases to replace the crankshaft seal in the points side that I put in backwards originally (big oops). Some pics to come soon.

As it sits right now (minus head, which has been sent out)

« Last Edit: January 12, 2017, 05:55:29 PM by Davez134 »
Logged

Offline SOHC4 Cafe Racer Fan

  • Speak up, Whipper-Snapper! I'm a
  • Really Old Timer ...
  • *******
  • Posts: 15,556
  • SOHC/4 Member #1235
Re: 1972 CB750K2 (start from scratch) project.
« Reply #502 on: January 12, 2017, 07:15:03 PM »
That motor looks pretty clean.
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

Offline Davez134

  • Expert
  • ****
  • Posts: 1,485
Re: 1972 CB750K2 (start from scratch) project.
« Reply #503 on: January 12, 2017, 08:19:21 PM »
Quote from: CB750 Cafe Racer Fan on January 12, 2017, 07:15:03 PM
That motor looks pretty clean.

Yeah, I was pleased to see the cam was well oiled and things were nice and clean. The pistons however were caked with deposits, and oil was even in the valve relief of #1. My head is in good hands now ;) wait that sounded weird.
Logged

Offline SOHC4 Cafe Racer Fan

  • Speak up, Whipper-Snapper! I'm a
  • Really Old Timer ...
  • *******
  • Posts: 15,556
  • SOHC/4 Member #1235
Re: 1972 CB750K2 (start from scratch) project.
« Reply #504 on: January 12, 2017, 08:43:54 PM »
Quote from: Davez134 on January 12, 2017, 08:19:21 PM
Quote from: CB750 Cafe Racer Fan on January 12, 2017, 07:15:03 PM
That motor looks pretty clean.

Yeah, I was pleased to see the cam was well oiled and things were nice and clean. The pistons however were caked with deposits, and oil was even in the valve relief of #1. My head is in good hands now ;) wait that sounded weird.

I wonder if better gas or detergent gas helps keep deposits at bay.
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

Offline Davez134

  • Expert
  • ****
  • Posts: 1,485
Re: 1972 CB750K2 (start from scratch) project.
« Reply #505 on: January 12, 2017, 09:13:35 PM »
Or maybe it was from oil leaking down into the chambers? Unfortunately I have nothing to compare it to.
Logged

Offline Stev-o

  • Ain't no
  • Really Old Timer ...
  • *******
  • Posts: 34,472
  • Central Texas
Re: 1972 CB750K2 (start from scratch) project.
« Reply #506 on: January 13, 2017, 08:42:58 AM »
Hey Davez....did you previously have this motor apart?
Logged
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline Davez134

  • Expert
  • ****
  • Posts: 1,485
Re: 1972 CB750K2 (start from scratch) project.
« Reply #507 on: January 13, 2017, 01:24:51 PM »
Quote from: Stev-o on January 13, 2017, 08:42:58 AM
Hey Davez....did you previously have this motor apart?

Yes, full rebuild.
Logged

Offline SOHC4 Cafe Racer Fan

  • Speak up, Whipper-Snapper! I'm a
  • Really Old Timer ...
  • *******
  • Posts: 15,556
  • SOHC/4 Member #1235
Re: 1972 CB750K2 (start from scratch) project.
« Reply #508 on: January 13, 2017, 07:06:55 PM »
Quote from: Davez134 on January 13, 2017, 01:24:51 PM
Quote from: Stev-o on January 13, 2017, 08:42:58 AM
Hey Davez....did you previously have this motor apart?

Yes, full rebuild.

Twice the fun!  How many miles did you have on it Dave?
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

Offline Davez134

  • Expert
  • ****
  • Posts: 1,485
Re: 1972 CB750K2 (start from scratch) project.
« Reply #509 on: January 13, 2017, 07:17:19 PM »
Quote from: CB750 Cafe Racer Fan on January 13, 2017, 07:06:55 PM
Quote from: Davez134 on January 13, 2017, 01:24:51 PM
Quote from: Stev-o on January 13, 2017, 08:42:58 AM
Hey Davez....did you previously have this motor apart?

Yes, full rebuild.

Twice the fun!  How many miles did you have on it Dave?
Almost 6,000.  And everything else looks/checks out fine too. Just the worn valve guides. If I didn't want to replace that crank seal I wouldn't even need to split cases, but might as well. Got new rings, and going to do a quick hone before I set the gaps and re-install. I really didn't want to do all this, but trying to make the best of it.
Logged

Offline SOHC4 Cafe Racer Fan

  • Speak up, Whipper-Snapper! I'm a
  • Really Old Timer ...
  • *******
  • Posts: 15,556
  • SOHC/4 Member #1235
Re: 1972 CB750K2 (start from scratch) project.
« Reply #510 on: January 13, 2017, 08:09:50 PM »
It'll be tight and right.
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

Offline Davez134

  • Expert
  • ****
  • Posts: 1,485
Re: 1972 CB750K2 (start from scratch) project.
« Reply #511 on: January 19, 2017, 08:40:21 PM »
I've regressed. I've got a roller!

Never mind the messy garage!


Sent from my iPhone using Tapatalk
Logged

Offline SOHC4 Cafe Racer Fan

  • Speak up, Whipper-Snapper! I'm a
  • Really Old Timer ...
  • *******
  • Posts: 15,556
  • SOHC/4 Member #1235
Re: 1972 CB750K2 (start from scratch) project.
« Reply #512 on: January 19, 2017, 09:52:51 PM »
Sometimes it's two steps forward, ten steps back.  But it will be worth it.
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

Offline Davez134

  • Expert
  • ****
  • Posts: 1,485
Re: 1972 CB750K2 (start from scratch) project.
« Reply #513 on: January 22, 2017, 07:31:34 PM »
Made a stupid "OOPS" today. I was splitting the cases to replace the crank seal. I have the engine on my stand, and when I flipped it over my brace that I made to hold the front wasn't locked in place. It slid out as soon as I removed the rod from the back of the lower case holding it to the stand. The top case swung down and I bent two of the Kibblewhite HD studs! Damnit! Thats what I get for not checking my equipment. :( I'll go take a picture when I feel less depressed!
« Last Edit: January 22, 2017, 07:38:42 PM by Davez134 »
Logged

Offline rickmoore24

  • Be led by your dreams, not pushed by your problems.
  • Hot Shot
  • ***
  • Posts: 746
  • I <3 SOHC4's
    • Rosenbard Films
Re: 1972 CB750K2 (start from scratch) project.
« Reply #514 on: January 22, 2017, 09:33:04 PM »
FUUUUUUUUUUUUUUGGG!!! That's such a bummer.
Logged
1972 CB750 K2 (Daily Runner)
1972 CB750 K2 (Sold)
1973 CB750 K3 (Hardtail 836cc)
1998 CBR F3 - R.I.P., went down on the 101 in Calabasas, Ca.
1995 EG6

Offline evanphi

  • Apparently I'm an
  • Old Timer
  • ******
  • Posts: 3,106
  • Rhonda the Basket Case
Re: 1972 CB750K2 (start from scratch) project.
« Reply #515 on: January 23, 2017, 06:37:23 AM »
Me bending my brake rod removing my rear wheel doesn't seem so bad now.

A minor "D'OH" moment.
Logged
--Evan

1975 CB750K "Rhonda"
Delkevic Stainless 4-1 Header, Cone Engineering 18" Quiet Core Reverse Cone, K&N Filter in Drilled Airbox
K5 Crankcase/Frame, K4 Head and Cylinders, K1 Carbs (42;120;1 Turn)

She's a mix-matched (former) basket case, but she's mine.

CB750 Shop Manual (all years), searchable text PDF
Calculating the correct input circumference for digital speedometers connected to the original speedometer drive

Offline Davez134

  • Expert
  • ****
  • Posts: 1,485
Re: 1972 CB750K2 (start from scratch) project.
« Reply #516 on: January 23, 2017, 07:51:52 AM »
Quote from: evanphi on January 23, 2017, 06:37:23 AM
Me bending my brake rod removing my rear wheel doesn't seem so bad now.

A minor "D'OH" moment.

Yeah, I would at least bend that brake rod back. I'm not even thinking about fixing these, just bucked up and ordered new ones.
Logged

Offline edwardmorris

  • Youngish
  • Old Timer
  • ******
  • Posts: 3,141
  • Do not cause harm, nor respond to harm with harm.
Re: 1972 CB750K2 (start from scratch) project.
« Reply #517 on: January 23, 2017, 10:33:00 AM »
Damn dude! Kibbles take some work bending! Oh well, hopefully not too much work for you to get it all back together.
Logged

Offline Davez134

  • Expert
  • ****
  • Posts: 1,485
Re: 1972 CB750K2 (start from scratch) project.
« Reply #518 on: January 23, 2017, 07:54:57 PM »
Quote from: edwardmorris on January 23, 2017, 10:33:00 AM
Damn dude! Kibbles take some work bending! Oh well, hopefully not too much work for you to get it all back together.

Yeah, that's why I'm just getting new ones. Don't trust those two now after that force. I'm almost ready to mate the cases. Everything is all cleaned up, new Honda seals. I'm just gonna take a break for the night. I'll take a pic of the bent studs after the motor is upright again.
Logged

Offline Davez134

  • Expert
  • ****
  • Posts: 1,485
Re: 1972 CB750K2 (start from scratch) project.
« Reply #519 on: January 24, 2017, 12:52:22 PM »
Here is my oops!


But I finally got this seal replaced right



Sent from my iPhone using Tapatalk
Logged

Offline rickmoore24

  • Be led by your dreams, not pushed by your problems.
  • Hot Shot
  • ***
  • Posts: 746
  • I <3 SOHC4's
    • Rosenbard Films
Re: 1972 CB750K2 (start from scratch) project. Cases back together
« Reply #520 on: January 24, 2017, 01:07:05 PM »
Bent em pretty good! New ones are a good call.   :)
Logged
1972 CB750 K2 (Daily Runner)
1972 CB750 K2 (Sold)
1973 CB750 K3 (Hardtail 836cc)
1998 CBR F3 - R.I.P., went down on the 101 in Calabasas, Ca.
1995 EG6

Offline SOHC4 Cafe Racer Fan

  • Speak up, Whipper-Snapper! I'm a
  • Really Old Timer ...
  • *******
  • Posts: 15,556
  • SOHC/4 Member #1235
Re: 1972 CB750K2 (start from scratch) project. Cases back together
« Reply #521 on: January 24, 2017, 02:36:44 PM »
Arggghhhh!!!!  :o  Yep, good call on replacing!
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

Offline BLAC

  • An espresso is a
  • Hot Shot
  • ***
  • Posts: 691
Re: 1972 CB750K2 (start from scratch) project. Cases back together
« Reply #522 on: January 24, 2017, 03:23:50 PM »
Just read through pretty much your whole thread... amazing work.

your leak issues are making me feel a little queasy as I am mid engine build, but there are great bits of into here. Thanks for sharing all of these steps. Ill be checking the direction of my seals VERY carefully.

Logged
If you can't fix it with a hammer, it's an electrical problem... If it's an electrical problem, it's Cal's problem.

*2005 Yamaha R6 (sold)
*2014 Ducati Streetfighter 848 (sold)
*2014 BMW S1000RR (sold)
*2010 Ducati Streetfighter S
*1978 CB550 Restomod Build
*1974 CB550 Monoshock build
http://forums.sohc4.net/index.php/topic,154614.0.html

Offline Davez134

  • Expert
  • ****
  • Posts: 1,485
Re: 1972 CB750K2 (start from scratch) project. Cases back together
« Reply #523 on: January 24, 2017, 04:33:46 PM »
Quote from: BLAC on January 24, 2017, 03:23:50 PM
Just read through pretty much your whole thread... amazing work.

your leak issues are making me feel a little queasy as I am mid engine build, but there are great bits of into here. Thanks for sharing all of these steps. Ill be checking the direction of my seals VERY carefully.

Thanks! Nothing to be queasy about, just learn from my mistakes. Use Honda seals when possible, and put them in correctly haha.
Logged

Offline Davez134

  • Expert
  • ****
  • Posts: 1,485
Re: 1972 CB750K2 (start from scratch) project. Cases back together
« Reply #524 on: January 27, 2017, 11:39:11 AM »
Bent studs? What bent studs?




Sent from my iPhone using Tapatalk
Logged
Pages: 1 ... 19 20 [21] 22 23   Go Up
« previous next »