Author Topic: Korvens Cb500 original restoration  (Read 4841 times)

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Offline SOHC4 Cafe Racer Fan

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Re: Korvens Cb500 original restoration
« Reply #25 on: May 23, 2020, 07:27:56 PM »
I am about to finish up this restoration. its been a bit slow in the end. Just waiting for the fuel tap and some stickers to finish it up. It did start up real nice after a few revolutions. I got the Candy paint back and im real satisfied (i did save the old tank for a build later on) Notice in the speedopicture that i almost forgot to put on the needle, that would have been a drag. Im gonna get some better pictures once i got it on the road.






WOW! What a looker!
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 PeWe

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Re: Korvens Cb500 original restoration
« Reply #26 on: May 24, 2020, 07:37:00 AM »
Another old bike saved!
Wow! They really look good back then when new! :D

Time for another photo in a future calendar? ;)
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline PeWe

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Re: Korvens Cb500 original restoration
« Reply #27 on: May 24, 2020, 08:21:26 AM »
Is it running yet?
I have nominated your build.

http://forums.sohc4.net/index.php?topic=180400.msg2114766.msg#2114766
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline SOHC4 Cafe Racer Fan

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Re: Korvens Cb500 original restoration
« Reply #28 on: May 24, 2020, 10:23:48 AM »
Is it running yet?
I have nominated your build.

http://forums.sohc4.net/index.php?topic=180400.msg2114766.msg#2114766

I would have done it myself, but he said he was "about to finish."  Not sure what that means - probably hasn't been fired and ridden yet, BUT it sure looks fantastic.
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 76ss

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Re: Korvens Cb500 original restoration
« Reply #29 on: May 24, 2020, 12:51:58 PM »
That’s one clean machine... keep up the good work 👍

Offline Stev-o

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Re: Korvens Cb500 original restoration
« Reply #30 on: May 24, 2020, 02:29:53 PM »
Looks great!
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline MauiK3

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Re: Korvens Cb500 original restoration
« Reply #31 on: May 24, 2020, 02:59:18 PM »
Another beautiful save!
1973 CB 750 K3
10/72 build Z1 Kawasaki

Offline SOHC4 Cafe Racer Fan

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Re: Korvens Cb500 original restoration
« Reply #32 on: May 24, 2020, 03:40:26 PM »
Looks like you ended up with the NOS tank that was your brother's.  That gold color is amazing.
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 bek1966

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Re: Korvens Cb500 original restoration
« Reply #33 on: May 24, 2020, 03:55:03 PM »
Absolutely beautiful!  I like them all, but to me the 500 is the best looking of the three (750, 550, 500).

Thanks for sharing your project.
Brad
1971 CB750 K1 - Candy Gold
1971 CB500 K0 - Star Light Gold
1974 CB350 F1 - Glory Blue Black

Pleasant Prairie, Wisconsin

Offline Korven

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Re: Korvens Cb500 original restoration
« Reply #34 on: May 25, 2020, 05:20:59 AM »
Looks like you ended up with the NOS tank that was your brother's.  That gold color is amazing.

Acctually its new paint! There is a ton of clearcoat on so there is alot of room for polishing out scratches that might happen later on.

Is it running yet?
I have nominated your build.

http://forums.sohc4.net/index.php?topic=180400.msg2114766.msg#2114766




Its not on the road yet, im still waiting for the fuel tap. Gonna get it run in, put the stickers on, sync the carbs. I want to restore the chainguard aswell, its got alot of microscratches. gonna try and polish those out with 4k paper as an experiment. Once i have it out on the road i can take some better pictures and then i can accept the nomination. Thanks for the nomination btw.


This is how the old tank looked like. I was sure to remove and color that was inside the oring on the fuel tap. This is what happens once the gas starts creeping inside the paint, notice the bubbles. Its not to bad, good thing i noticed when i was emptying it of gas for storage for a build later on.

Thanks everyone for your kind words. I have been kind of busy so havent been a whole lot of documentation of the build in this thread from my part. Soon comes the next part of a new project. School is out next week and there is nothing really to do at work so im probably without work. it means i will have alot of time this summer but no steady money income except for a tax refund, so we are on a budget here. I have started to slowly buy parts for two new projects:





a Cb500 mystery race engine. Its totally rebuilt by someone but the pistons are hitting the sparkplugs. (could it be a 650 crank? i read that it had 2mm longer stroke) That tells me it should have real high compression. I've tested it by removing all plugs and and it had 150psi> (the electrical drill burned out while pulling it around) I guess its good for a engine that has never been run. It dont know much about it except for what is revealed from the outside. Ported head, outlets for oil cooler. 650 pump. K3 engine block but with the k1 clutch, not sure what guts. heavy duty studs, should be a new primary chain and bearings. The cb500 tacho drive fits, im curious to what camshaft is in there. It would be silly if its a standard, not sure if it could be a 650 when the tacho drive fits, but should be the most reasonable choice. Im not sure what to expect
I found a cheap K0 frame, perhaps i could do some kind of cheap "scrape the floor" bike with the parts that did not make it for this restoration.

Got myself a Cb750 k2 frame. Was thinking it could be fun to do a bigger bike aswell. With loaned parts from my brother that has build around the years, i could pay him back once stuff is back in order. It would be a shame to just waste all this time by doing nothing.

Would be fun to restore the VFR400 aswell but sourcing parts for it will get alot harder with the brexit in half a year. That surely will need some economic muscles and it would suck to be forced to sell a bike that i dont want to sell so im guessing it will have to wait a while. Some milage on it this summer will keep both me and the bike happy atleast.


« Last Edit: May 25, 2020, 06:56:33 AM by Korven »

Offline Hariii

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Re: Korvens Cb500 original restoration
« Reply #35 on: May 27, 2020, 09:45:17 AM »
What a beauti  :)

Offline PeWe

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Re: Korvens Cb500 original restoration
« Reply #36 on: May 27, 2020, 10:50:45 AM »
It is so shining new and clean, all over.
Perfect for the living room.
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline Korven

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Re: Korvens Cb500 original restoration
« Reply #37 on: May 31, 2020, 12:26:47 PM »
Some photos below: Did a 100km run today to get it running. found some flaws and fixed some. I runs a bit lean, i had to run it with some slight choke. might be the 550 cylinder, on my list. Something wrong with the starter motor - bad earth, the relay or the motor itself. Sqeaky brakes and some squaky noise from the wheel bearingdust seal, you can hear it when you push the bike around, very rubbery sound. did i forget to put some lube in there. Except that, everything works flawlessly. it runs great.



















« Last Edit: May 31, 2020, 12:28:30 PM by Korven »

Offline bek1966

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Re: Korvens Cb500 original restoration
« Reply #38 on: May 31, 2020, 02:55:06 PM »
The bike looks even better in the sunlight.  Fantastic! 

Brad
1971 CB750 K1 - Candy Gold
1971 CB500 K0 - Star Light Gold
1974 CB350 F1 - Glory Blue Black

Pleasant Prairie, Wisconsin

Offline SOHC4 Cafe Racer Fan

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Re: Korvens Cb500 original restoration
« Reply #39 on: May 31, 2020, 08:49:57 PM »
I think it's time for you to accept the nomination now.  ;D
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 Korven

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Re: Korvens Cb500 original restoration
« Reply #40 on: May 31, 2020, 11:39:38 PM »
I think it's time for you to accept the nomination now.  ;D

Done!

Offline Korven

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Re: Korvens Cb500 original restoration
« Reply #41 on: August 16, 2020, 02:37:42 PM »
First of all thanks nominating my restoration for BOTM, real honored to participate. I feel like i need to do a small update here on whats going on with the bike.
I sorted a few issues such a battery not charging properly (gap on regulator now set) Squaky brakes fixed and replaced the oil switch sensor.

The only small issue now is that i got a flatspot at  ~6k rpm when grabbing a bit of throttle, seems to be a bit of a flatspot here. It hesitates just so slightly but pulls strongly once its past that spot. I tried raising the needle (this can be done with carbs on the bike i noticed) but only resulted in poor perfomance in the 2-3K rpm range. I replaced the Air jets with oem ones since they keysters didnt look the same. it runs slightly worse at 0.5 turns out and the same at 1.5 turns and more. Gonna try with 80 mains and see if that fixes the issue. the bike got a 550 cylinder so not sure how that affects the flow. Still awaiting the master cylinder from adonizing and hopefully it will come on this winter.

I have now put 1200 km on the bike and have done 2 oil changes to flush the engine. One at 100km and one at 300. I now consider the bike run in. I clocked it on the gps and it pulls too just above 150+. I must say the bike handles really well, no shaking when easing of the throttle and wheels seem to be well balanced. I took me two evening to put the spokes on and i tuned it to less than 0.2mm side to side and up/down and that seems to pay off. I dont ride my VFR 800 much faster on twisty roads.






« Last Edit: August 17, 2020, 12:10:12 AM by Korven »

Offline jeff d

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Re: Korvens Cb500 original restoration
« Reply #42 on: August 16, 2020, 03:48:13 PM »
Awesome build!  Thanks for taking the time to share it.
Longtime caretaker of Hondas but new to SOHC/4's

Offline seanbarney41

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Re: Korvens Cb500 original restoration
« Reply #43 on: August 16, 2020, 07:15:35 PM »
exceptional!  Great to see a young guy doing these bikes so right.
If it works good, it looks good...