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Author Topic: 1972 CB750 Four K2 -- Rebuilt to NEW OLD STOCK -- PIX ON PAGE 50  (Read 241294 times)

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Offline edwardmorris

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"-- SLOW ASSEMBLY
« Reply #925 on: April 29, 2015, 08:51:49 PM »
All new pucks, sealed and installed. Readied the NOS Cam and NOS sprocket.
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Offline edwardmorris

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"-- SLOW ASSEMBLY
« Reply #926 on: April 29, 2015, 08:55:55 PM »
Lined up things as they need to be, then torqued down the towers to 80 in-lbs, and the sprocket bolts to 90 in-lbs. Looked at the time and realized its been 12 hours straight at this starting here

http://forums.sohc4.net/index.php/topic,126735.msg1677361.html#msg1677361

So covered it all up and came back inside. Totally forgot to take a pic of how it looks now  >:( >:(
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Offline SOHC4 Cafe Racer Fan

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"-- SLOW ASSEMBLY
« Reply #927 on: April 29, 2015, 09:16:45 PM »
NOS cam?! Where did you find that?
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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 edwardmorris

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"-- SLOW ASSEMBLY
« Reply #928 on: April 29, 2015, 09:22:03 PM »
Quote from: CB750 Cafe Racer Fan on April 29, 2015, 09:16:45 PM
NOS cam?! Where did you find that?
Frank/754 sold me his. Despite my sincerest efforts, I couldn't get him to sell me a NOS oil pump :( (He has plans on using it with his 1000cc build). But thank goodness to Elan's super kits and some near new goodies from members here, the engine is ALMOST a NOSSER ;D ;D ;D
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Offline SOHC4 Cafe Racer Fan

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"-- SLOW ASSEMBLY
« Reply #929 on: April 29, 2015, 09:41:48 PM »
NOS oil pump is truly unobtainium.
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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 evanphi

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"-- SLOW ASSEMBLY
« Reply #930 on: April 30, 2015, 03:06:24 AM »
WOW some fancy stuff going on...

Your engine, if it could talk:
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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 Restoration Fan

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"-- SLOW ASSEMBLY
« Reply #931 on: April 30, 2015, 05:23:48 AM »
Wow.  Just wow.
VERY impressive and the way you're documenting it is going to be invaluable to many people doing this after you.  Thank you for taking the time to do that.
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Ron

Stella - Logan's Senior Project    78 750K http://forums.sohc4.net/index.php?topic=141761.0

Logan's Reward - CB500 and CB550 Cafes    http://forums.sohc4.net/index.php/topic,147787.0.html

Offline MCRider

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"-- SLOW ASSEMBLY
« Reply #932 on: April 30, 2015, 11:57:51 AM »
Quote from: CB750 Cafe Racer Fan on April 29, 2015, 09:41:48 PM
NOS oil pump is truly unobtainium.
I have the nearest thing to a NOS pump in one I bot from Ebay with 7500 miles on it. Just popped the sides on it to do a Elan rebuild, and the rotors are nice and pristine.  Why the rebuild you ask? Even with the low mileage it would wet sump the oil out of the tank into the crankcases in a matter of days. So even Frank's may need to be opened up and the rubber bits refreshed.

I think I'd install it first and see though.   :D

Only New is truly New. Like the Cycle X one.
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Ride Safe:
Ron
1988 NT650 HawkGT;  1978 CB400 Hawk;  1975 CB750F -Free Bird; 1968 CB77 Super Hawk -Ticker;  Phaedrus 1972 CB750K2- Build Thread
"Sometimes the light's all shining on me, other times I can barely see, lately it appears to me, what a long, strange trip its been."

Offline SOHC4 Cafe Racer Fan

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"-- SLOW ASSEMBLY
« Reply #933 on: April 30, 2015, 12:10:22 PM »
Yeah, but that Cycle X one is PRICEY!!! Granted, if you are running a competition motor and you have huge sums of money wrapped up in your engine, you don't want your oil pump to fail and cause a catastrophic failure.
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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 edwardmorris

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"-- SLOW ASSEMBLY
« Reply #934 on: April 30, 2015, 01:19:59 PM »
Quote from: MCRider on April 30, 2015, 11:57:51 AM
Quote from: CB750 Cafe Racer Fan on April 29, 2015, 09:41:48 PM
NOS oil pump is truly unobtainium.
I have the nearest thing to a NOS pump in one I bot from Ebay with 7500 miles on it. Just popped the sides on it to do a Elan rebuild, and the rotors are nice and pristine.  Why the rebuild you ask? Even with the low mileage it would wet sump the oil out of the tank into the crankcases in a matter of days. So even Frank's may need to be opened up and the rubber bits refreshed.

I think I'd install it first and see though.   :D

Only New is truly New. Like the Cycle X one.
I was planning to rebuild it anyway had I managed to acquire it. Mostly wanted the untouched impellers and end caps. Came pretty close to it, found a set of impellers and end caps from member Godffrey here with super low miles and almost no wear on them. Have a pump with even fewer miles and better impellers saved for the K3, thanks to Bill Benton 8) 8)
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Offline MCRider

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"-- SLOW ASSEMBLY
« Reply #935 on: April 30, 2015, 01:48:35 PM »
Nice scores. I do think we are all suffering from some misplaced paranoia. Other than the rubber bits, the rotors can get scratchy, but doesn't affect performance. And I've never heard of one failing. Under any circumstance. (Hmm I wonder what RC used?)
OCICBW

Nevertheless, fresh and pristine will always feel better.
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Ride Safe:
Ron
1988 NT650 HawkGT;  1978 CB400 Hawk;  1975 CB750F -Free Bird; 1968 CB77 Super Hawk -Ticker;  Phaedrus 1972 CB750K2- Build Thread
"Sometimes the light's all shining on me, other times I can barely see, lately it appears to me, what a long, strange trip its been."

Offline SOHC4 Cafe Racer Fan

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"-- SLOW ASSEMBLY
« Reply #936 on: April 30, 2015, 01:52:07 PM »
Not sure what RC Engineering ran on their bikes.  It probably did not cost $750!
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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 MCRider

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"-- SLOW ASSEMBLY
« Reply #937 on: April 30, 2015, 04:23:13 PM »
Quote from: CB750 Cafe Racer Fan on April 30, 2015, 01:52:07 PM
Not sure what RC Engineering ran on their bikes.  It probably did not cost $750!
My money's on stock. Maybe RC Jr can tell us someday.
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Ride Safe:
Ron
1988 NT650 HawkGT;  1978 CB400 Hawk;  1975 CB750F -Free Bird; 1968 CB77 Super Hawk -Ticker;  Phaedrus 1972 CB750K2- Build Thread
"Sometimes the light's all shining on me, other times I can barely see, lately it appears to me, what a long, strange trip its been."

Offline edwardmorris

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"-- SLOW ASSEMBLY
« Reply #938 on: May 01, 2015, 06:11:08 PM »
Question:

I forgot two things when putting the cases back together. The carb overflow tube guide and the electrical wire routing guide under the counter sprocket cover. Is there any danger in undoing and re-torquing just those two bolts? One's a 6 and the other's an 8 mm.
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Offline Bill/BentON Racing

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"-- SLOW ASSEMBLY
« Reply #939 on: May 01, 2015, 06:53:22 PM »
No, just do one at a time. Bill
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BentON Racing Website
OEM Parts | Service | Custom Builds
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Over 35 years of experience working on vintage motorcycles, with a speciality in Honda SOHC/4 with a focus on the CB750 and other models as well from 1966 - 1985.
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1993 HRC RS125 | 1984 NS400R | 1974 Honda CB750/836cc (Calendar Girl) | 1972 CB 500/550 Yoshi Kitted 590cc | 1965 Honda CB450 Black Bomber | 1972 Suzuki T350 | 1973 88cc | Z50/Falcons Pit Bike | 1967 CA100| 1974 CB350 (400F motor)...and more.
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Offline edwardmorris

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"-- SLOW ASSEMBLY
« Reply #940 on: May 01, 2015, 10:22:51 PM »
Quote from: Bill/BentON Racing on May 01, 2015, 06:53:22 PM
No, just do one at a time. Bill
Phew! That's a relief, thanks Bill! On deck for tomorrow. Had a couple hours today so rebuilt the starter. Wanted to get it out of the way and installed so I can get to installing the cam chain tensioner cover. Had a NOS rebuild kit, but its missing a few things that the parts fiche doesn't show. Can't be bothered with it for now, gotta get on the road so moved along. Cleaned up the contact surface with 1200 grit and a push pin to clear the ridges. Case ends and coils cleaned out with CRC quick dry electronics cleaner.
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Offline edwardmorris

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"-- SLOW ASSEMBLY
« Reply #941 on: May 01, 2015, 10:25:10 PM »
All new brushes, the spec on these is 5mm and the old ones look pretty close to getting there. Trusty mineral based oil to lube up the shaft, new case o-ring seals.
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Offline edwardmorris

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"-- SLOW ASSEMBLY
« Reply #942 on: May 01, 2015, 10:28:04 PM »
There was a tiny tear in the sleeving towards the motor end where there was a sharp bend. Used flexible electrical tape on that spot, then slipped over a new sleeve, just the perfect amount was left over from when I rebuilt the controls.

Used a flap wheel to spruce up the terminal, then slipped on a NOS boot.

Final o-ring will be installed when I'm ready to drop it in its place.
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Offline Restoration Fan

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"-- SLOW ASSEMBLY
« Reply #943 on: May 02, 2015, 03:44:54 AM »
Man, you do some great work.  I'm totally enjoying this thread.  Keep up the great work with the bike and the photo/written documentation.
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Ron

Stella - Logan's Senior Project    78 750K http://forums.sohc4.net/index.php?topic=141761.0

Logan's Reward - CB500 and CB550 Cafes    http://forums.sohc4.net/index.php/topic,147787.0.html

Offline edwardmorris

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"-- SLOW ASSEMBLY
« Reply #944 on: May 02, 2015, 10:08:24 PM »
Thanks!

Not a whole lot got done but plugging away as I make time. Got the missing bits installed on the crankcases following Bill's advice. Also, just another shot of the NOS cam, love how cool this thing is!
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Offline edwardmorris

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"-- SLOW ASSEMBLY
« Reply #945 on: May 02, 2015, 10:10:51 PM »
Rockers installed, all new tappets and nuts, the old ones weren't bad, but I want a fresh start with the all new everything JMR head. Almost forgot the cam end bolt, thank goodness I rememberd  ;D
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Offline edwardmorris

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"-- SLOW ASSEMBLY
« Reply #946 on: May 02, 2015, 10:38:13 PM »
Installed the starter motor with new bolts. Was about to install the cam chain tensioner then stopped because I'm waiting on the oil pressure switch boot and wire to arrive. Really pissed off at this because I thought the alternator sub harness from yamiya included the oil pressure switch wire, but it doesn't. Has anyone tried installing the starter motor cover AFTER installing the cam chain tensioner? Or will it just plain not work? I want to get the tappet clearances set while the motor is still on the bench  :-\ :-\
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Offline seanbarney41

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"-- SLOW ASSEMBLY
« Reply #947 on: May 02, 2015, 11:27:11 PM »
It's a very slight wiggle to get the starter cover on underneath the cam chain tensioner.
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If it works good, it looks good...

Offline Stev-o

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"-- SLOW ASSEMBLY
« Reply #948 on: May 03, 2015, 01:09:39 PM »
Quote from: seanbarney41 on May 02, 2015, 11:27:11 PM
It's a very slight wiggle to get the starter cover on underneath the cam chain tensioner.

+1...not an issue.
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'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline edwardmorris

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Re: 1972 CB750 Four K2 -- Project "Ice Cream"-- SLOW ASSEMBLY
« Reply #949 on: May 03, 2015, 03:53:01 PM »
Thanks guys! I'll get back to that soon. Was hoping to install all the covers today and realized I'm also waiting on the shifter assembly spring (located a NOS one) so decided to take a break from the engine today. Thought about getting the forks and rear shocks back together so it will be an immediate roller once the engine goes in (wheels are ready).

Bummer though, major set back right at step one with the front forks. Only got as far as installing new drain bolts and washers. Had my fork tubes rechromed, BIG MISTAKE. Plated too thick, nothing will slide over. In my haste, I tried to force a piece and the plating started to scratch up :-[ :-[

Z1 parts has excellent hard chromed tubes, ordering them now, but I desperately need the circlips, band and the piston at the bottom of the tubes. Paged Bill, hopefully him or anyone reading has some for me :(
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