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Author Topic: 1972 CB750K2 (start from scratch) project. Cases back together  (Read 110945 times)

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Offline timbo750

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Re: 1972 CB750K2 (start from scratch) project. Call it done!
« Reply #325 on: March 26, 2015, 02:12:39 PM »
Dave, how did you find the Hagon shocks when riding 2up. I need to order some shocks soon and also plan some 2up riding.
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Offline Davez134

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Re: 1972 CB750K2 (start from scratch) project. Call it done!
« Reply #326 on: March 26, 2015, 03:13:32 PM »
Felt good. I went with the next available stiffer rate spring than stock recommendation, as we planned on riding together a bit.
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Offline Retro Rocket

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Re: 1972 CB750K2 (start from scratch) project. Call it done!
« Reply #327 on: March 26, 2015, 03:18:37 PM »
Quote from: timbo750 on March 26, 2015, 02:12:39 PM
Dave, how did you find the Hagon shocks when riding 2up. I need to order some shocks soon and also plan some 2up riding.

Tim, go with the Ikons{Koni's} mate, they are a better shock and are made locally, not knocking the Hagons they are fine, and better than stock shocks for sure, but the Ikons are a step up again, made in Australia and are rebuildable. I've used Ikons/Koni's on these old bikes {and others} since the late 70's and they are good, I've also done 1000+ Kilometer days 2 up several times. I still have some Ikons {30 year old and still good}, that i'll be using, in my garage... ;)

Dave, that bike looks excellent, love the color... ;)
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Offline SOHC4 Cafe Racer Fan

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Re: 1972 CB750K2 (start from scratch) project. Call it done!
« Reply #328 on: March 26, 2015, 04:18:33 PM »
Dave!

Gorgeous bike.  It turned out great.

Don
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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. Call it done!
« Reply #329 on: March 26, 2015, 07:01:40 PM »
Quote from: CB750 Cafe Racer Fan on March 26, 2015, 04:18:33 PM
Dave!

Gorgeous bike.  It turned out great.

Don

Thanks! Now I just need to take the wife on a bunch of rides until she wants one of her own 8)
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Offline SOHC4 Cafe Racer Fan

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Re: 1972 CB750K2 (start from scratch) project. Call it done!
« Reply #330 on: March 26, 2015, 10:28:24 PM »
Quote from: Davez134 on March 26, 2015, 07:01:40 PM
Quote from: CB750 Cafe Racer Fan on March 26, 2015, 04:18:33 PM
Dave!

Gorgeous bike.  It turned out great.

Don

Thanks! Now I just need to take the wife on a bunch of rides until she wants one of her own 8)

Good luck with that.  My better half has no desire to ride.
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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. Call it done!
« Reply #331 on: March 30, 2015, 10:30:47 AM »
Well, the leak came back. New gaskets on order. If you are undecided on installing a frame kit do it! As soon as gaskets get here, it should be about a hour job.




Sent from my iPhone using Tapatalk
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Offline Ravie

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Re: 1972 CB750K2 (start from scratch) project. Leak is back
« Reply #332 on: March 30, 2015, 10:44:36 AM »
What do you plan to use to seal it this time?

Im still undecided as to aviation permatex or copper spray. The copper spray is spendy and I already have the permatex on hand.
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1975 CB750K5 Rebuild in progress.
http://forums.sohc4.net/index.php?topic=139072.0

Offline Davez134

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Re: 1972 CB750K2 (start from scratch) project. Leak is back
« Reply #333 on: March 30, 2015, 10:55:09 AM »
Quote from: Ravie on March 30, 2015, 10:44:36 AM
What do you plan to use to seal it this time?

Im still undecided as to aviation permatex or copper spray. The copper spray is spendy and I already have the permatex on hand.
I'm going to use Hondabond 4, since I have a whole tube of it.
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Offline SOHC4 Cafe Racer Fan

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Re: 1972 CB750K2 (start from scratch) project. Call it done!
« Reply #334 on: March 30, 2015, 11:49:14 AM »
Quote from: Davez134 on March 30, 2015, 10:30:47 AM
Well, the leak came back. New gaskets on order. If you are undecided on installing a frame kit do it! As soon as gaskets get here, it should be about a hour job.




Sent from my iPhone using Tapatalk

Welcome to the suck.  Been there!  Go sparingly on the Hondabond.
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 edwardmorris

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Re: 1972 CB750K2 (start from scratch) project. Leak is back
« Reply #335 on: March 30, 2015, 12:32:02 PM »
Dave,

    I was chatting with Mark about this and he suggested that the thickness of the o-rings is generally the culprit here. Before installing the new gaskets, check to make sure the o-rings are thicker/taller than the gasket. I'll dig up the exact numbers if I can. I have two vesrah kits collecting dust right now, as I've decided to go with MLS head and base gaskets after talking to a few people.
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Offline Davez134

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Re: 1972 CB750K2 (start from scratch) project. Leak is back
« Reply #336 on: March 30, 2015, 12:45:42 PM »
Quote from: edwardmorris on March 30, 2015, 12:32:02 PM
Dave,

    I was chatting with Mark about this and he suggested that the thickness of the o-rings is generally the culprit here. Before installing the new gaskets, check to make sure the o-rings are thicker/taller than the gasket. I'll dig up the exact numbers if I can. I have two vesrah kits collecting dust right now, as I've decided to go with MLS head and base gaskets after talking to a few people.

I remember reading that. Thanks! I will check for sure. Let me know I you get the numbers. I believe it was between 2.5 or 3mm thick?
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Offline Ravie

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Re: 1972 CB750K2 (start from scratch) project. Leak is back
« Reply #337 on: March 30, 2015, 12:49:43 PM »
:-O makin me scared about my vesrah kit now.
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1975 CB750K5 Rebuild in progress.
http://forums.sohc4.net/index.php?topic=139072.0

Offline edwardmorris

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Re: 1972 CB750K2 (start from scratch) project. Leak is back
« Reply #338 on: March 30, 2015, 01:06:47 PM »
Quote from: Davez134 on March 30, 2015, 12:45:42 PM
Quote from: edwardmorris on March 30, 2015, 12:32:02 PM
Dave,

    I was chatting with Mark about this and he suggested that the thickness of the o-rings is generally the culprit here. Before installing the new gaskets, check to make sure the o-rings are thicker/taller than the gasket. I'll dig up the exact numbers if I can. I have two vesrah kits collecting dust right now, as I've decided to go with MLS head and base gaskets after talking to a few people.

I remember reading that. Thanks! I will check for sure. Let me know I you get the numbers. I believe it was between 2.5 or 3mm thick?
Here you go

Quote from: PM Excerpt
................. Set the gasket in place and measure the depth, or the height of the O-rings above the gasket, to make sure they are taller than the gasket and hole combined. They should be between 0.14 and 0.20mm thicker than the gasket top...............
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Offline strynboen

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Re: 1972 CB750K2 (start from scratch) project. Leak is back
« Reply #339 on: March 30, 2015, 01:43:52 PM »
my vesra kit leaked 14 days after total reno..i have not done anything yet..after 3 years it are not blead to death...
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Offline Davez134

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Re: 1972 CB750K2 (start from scratch) project. Call it done!
« Reply #340 on: March 30, 2015, 02:21:01 PM »
Quote from: CB750 Cafe Racer Fan on March 30, 2015, 11:49:14 AM
Quote from: Davez134 on March 30, 2015, 10:30:47 AM
Well, the leak came back. New gaskets on order. If you are undecided on installing a frame kit do it! As soon as gaskets get here, it should be about a hour job.



Do you think I should put coating on the gasket itself, or the surfaces? I also have a can of copper spray? should I use that instead of hondabond? This is the LAST time I want to do this haha.


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Welcome to the suck.  Been there!  Go sparingly on the Hondabond.
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Offline Ravie

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Re: 1972 CB750K2 (start from scratch) project. Leak is back
« Reply #341 on: March 30, 2015, 02:56:20 PM »
Hondabond sets up too fast in my opinion. Seems like coating the whole thing would be better...
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1975 CB750K5 Rebuild in progress.
http://forums.sohc4.net/index.php?topic=139072.0

Offline edwardmorris

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Re: 1972 CB750K2 (start from scratch) project. Leak is back
« Reply #342 on: March 30, 2015, 04:26:06 PM »
What kind of gasket? MLS won't need any coating if the o-ring thickness is correct...
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Offline Davez134

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Re: 1972 CB750K2 (start from scratch) project. Leak is back
« Reply #343 on: March 30, 2015, 06:42:42 PM »
Quote from: edwardmorris on March 30, 2015, 04:26:06 PM
What kind of gasket? MLS won't need any coating if the o-ring thickness is correct...

Head gasket MLS, going on dry. Base gasket is Viton/steel.
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Offline edwardmorris

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Re: 1972 CB750K2 (start from scratch) project. Leak is back
« Reply #344 on: March 30, 2015, 07:09:07 PM »
Spray might be easiest unless you want to put in the work to get threebond/permatex#2 on it evenly. I know Flybox1 used copper spray thing on his base gasket and was leak free, he might have better tips.
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Offline Davez134

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Re: 1972 CB750K2 (start from scratch) project. Leak is back
« Reply #345 on: March 30, 2015, 07:19:29 PM »
I am leaning toward spray and correct o-rings, as I already have it, used it on my last base gasket without leaks.
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Offline Ravie

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Re: 1972 CB750K2 (start from scratch) project. Leak is back
« Reply #346 on: March 31, 2015, 04:06:22 PM »
Looked in my harbor freight O ring set and found the right size ring and measured it against the ones that came in the vesrah kit.  Vesrah rings measure 2.35mm and the HF rings measured 2.45.

Are there any issues with using them from a heat standpoint? Seems they'd be the better choice from the thickness standpoint.
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1975 CB750K5 Rebuild in progress.
http://forums.sohc4.net/index.php?topic=139072.0

Offline Davez134

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Re: 1972 CB750K2 (start from scratch) project. Leak is back
« Reply #347 on: March 31, 2015, 06:21:50 PM »
Heat would not be an issue. As far as the thickness goes, seems like it will be based on base gasket thickness. I'm going to measure mine as stared in reply #354 in this page
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Offline Ravie

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Re: 1972 CB750K2 (start from scratch) project. Leak is back
« Reply #348 on: March 31, 2015, 08:49:38 PM »
I measure about .69mm that the HF one sticks up above the channel when installed. The base gasket from my kit measures .47mm so roughly .20mm. That is a huge difference since the Vesrah kits o rings would have been half that height.
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1975 CB750K5 Rebuild in progress.
http://forums.sohc4.net/index.php?topic=139072.0

Offline Davez134

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Re: 1972 CB750K2 (start from scratch) project. Leak is back
« Reply #349 on: March 31, 2015, 10:01:44 PM »
Would go with the HF one then
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