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Author Topic: 1972 CB750K2 (start from scratch) project. Cases back together  (Read 100375 times)

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Offline SOHC4 Cafe Racer Fan

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Re: 1972 CB750K2 (start from scratch) project.
« Reply #525 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.
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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 Davez134

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Re: 1972 CB750K2 (start from scratch) project.
« Reply #526 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.
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Offline Stev-o

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Re: 1972 CB750K2 (start from scratch) project.
« Reply #527 on: January 13, 2017, 08:42:58 AM »
Hey Davez....did you previously have this motor apart?
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'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline Davez134

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Re: 1972 CB750K2 (start from scratch) project.
« Reply #528 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.
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Offline SOHC4 Cafe Racer Fan

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Re: 1972 CB750K2 (start from scratch) project.
« Reply #529 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?
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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 Davez134

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Re: 1972 CB750K2 (start from scratch) project.
« Reply #530 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.
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Offline SOHC4 Cafe Racer Fan

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Re: 1972 CB750K2 (start from scratch) project.
« Reply #531 on: January 13, 2017, 08:09:50 PM »
It'll be tight and right.
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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 Davez134

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Re: 1972 CB750K2 (start from scratch) project.
« Reply #532 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
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Offline SOHC4 Cafe Racer Fan

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Re: 1972 CB750K2 (start from scratch) project.
« Reply #533 on: January 19, 2017, 09:52:51 PM »
Sometimes it's two steps forward, ten steps back.  But it will be worth it.
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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 Davez134

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Re: 1972 CB750K2 (start from scratch) project.
« Reply #534 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 »
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Offline rickmoore24

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Re: 1972 CB750K2 (start from scratch) project.
« Reply #535 on: January 22, 2017, 09:33:04 PM »
FUUUUUUUUUUUUUUGGG!!! That's such a bummer.
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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

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Re: 1972 CB750K2 (start from scratch) project.
« Reply #536 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.
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--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

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Re: 1972 CB750K2 (start from scratch) project.
« Reply #537 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.
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Offline edwardmorris

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Re: 1972 CB750K2 (start from scratch) project.
« Reply #538 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.
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Offline Davez134

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Re: 1972 CB750K2 (start from scratch) project.
« Reply #539 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.
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Offline Davez134

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Re: 1972 CB750K2 (start from scratch) project.
« Reply #540 on: January 24, 2017, 12:52:22 PM »
Here is my oops!


But I finally got this seal replaced right



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Offline rickmoore24

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Re: 1972 CB750K2 (start from scratch) project. Cases back together
« Reply #541 on: January 24, 2017, 01:07:05 PM »
Bent em pretty good! New ones are a good call.   :)
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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

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Re: 1972 CB750K2 (start from scratch) project. Cases back together
« Reply #542 on: January 24, 2017, 02:36:44 PM »
Arggghhhh!!!!  :o  Yep, good call on replacing!
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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 BLAC

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Re: 1972 CB750K2 (start from scratch) project. Cases back together
« Reply #543 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.

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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

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Re: 1972 CB750K2 (start from scratch) project. Cases back together
« Reply #544 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.
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Offline Davez134

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Re: 1972 CB750K2 (start from scratch) project. Cases back together
« Reply #545 on: January 27, 2017, 11:39:11 AM »
Bent studs? What bent studs?




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Offline SOHC4 Cafe Racer Fan

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Re: 1972 CB750K2 (start from scratch) project. Cases back together
« Reply #546 on: January 27, 2017, 03:36:10 PM »
Like it never happened!
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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 BLAC

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Re: 1972 CB750K2 (start from scratch) project. Cases back together
« Reply #547 on: January 27, 2017, 03:39:29 PM »
I see that Kibbles makes head studs for the 750, is APE the only provider for HD studs for 550s? if not, who is best?

also, your studs look so much beefier than the toothpicks in my 550..
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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

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Re: 1972 CB750K2 (start from scratch) project. Cases back together
« Reply #548 on: January 27, 2017, 04:46:31 PM »
Quote from: BLAC on January 27, 2017, 03:39:29 PM
I see that Kibbles makes head studs for the 750, is APE the only provider for HD studs for 550s? if not, who is best?

also, your studs look so much beefier than the toothpicks in my 550..

If APE makes studs for your motor, go with it. They are high quality. Just follow the instructions (and I prefer using the installer tool as well. Makes it easier)
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Offline SOHC4 Cafe Racer Fan

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Re: 1972 CB750K2 (start from scratch) project. Cases back together
« Reply #549 on: January 27, 2017, 05:05:22 PM »
I'm not aware of any manufacturer of aftermarket HD studs for the 550 other than APE, but there are no complaints about the APE studs, so why bother?
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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
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