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Author Topic: First build: CB750 K3 cafe  (Read 20983 times)

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Offline SOHC4 Cafe Racer Fan

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Re: First build: CB750 K3 cafe
« Reply #50 on: August 29, 2016, 08:37:14 AM »
Nice looking covers.
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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 -JP-

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Re: First build: CB750 K3 cafe
« Reply #51 on: September 04, 2016, 02:21:21 AM »
I got the tank from the painter and the result is outstanding. Installed the gas cap and petcock. When I put the tank on the bike I noticed that the petcock hits the carb lifter arm. Not much but enough to make the throttle bind. I hope I can move the tank forward a bit cutting the rubber cushioning. If that doesn't work this can be a big problem.







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Offline -JP-

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Re: First build: CB750 K3 cafe
« Reply #52 on: September 04, 2016, 02:27:53 AM »
Quote from: calj737 on September 04, 2016, 02:24:20 AM
Paint looks really beautiful.

Worst case scenario, cut the pegs off the frame (the steel pins that the rubbers slip over) and move them forward, then reinstall the rubbers. If you have to weld them on, you'll only have a very small area of the frame to touch up and it will be beneath the tank and steering so it won't be obvious.
Thanks a lot. Good idea. Will look in to that.
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Offline 754

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Re: First build: CB750 K3 cafe
« Reply #53 on: September 04, 2016, 01:59:05 PM »
Should be clearance there .i would leave the mounts and grind off the petcock. Maybe..
 Can you shift tank to he right on rear mount ? Is petcock aftermarket ?
Nice paint, really like that..
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Offline -JP-

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Re: First build: CB750 K3 cafe
« Reply #54 on: September 04, 2016, 09:57:48 PM »
Petcock is original. There is not mutch to grind. I cut those rubber cushionings a bit and the tank moved forward a bit. Helped a little. Fuel line is still touching the arm mildly. Petcock is clear now. I'm trying to find fuel line that has smaller outer diameter. There is not mutch to move side ways in the rear. There is this rubber where the lip goes in and it keeps the rear in place. I will check that again.
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Offline -JP-

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Re: First build: CB750 K3 cafe
« Reply #55 on: September 05, 2016, 01:11:52 PM »
I got the petcock issue sorted out. Smaller fuel lines and i moved the tank a little to the right from the back.

There was an issue with the handlebars hitting the tank so I had to make stoppers to limit the movement. I cut a wheel balansing weight in half and glued the pieces to the stoppers.

Filled her up and it was time for the first ride! Being familiar with todays superbikes braking performance it was some what a mix off fear and happiness to get on the road. Well, the brakes are what they are. I have to admit that some kind of upgrade might be coming in the future. Maybe dual disc setup or something. I know I have to get used to this bike and get some kilometres on it. This was just a short ride around the block. But it was a nice one after all the work from the spring.





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Offline -JP-

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Re: First build: CB750 K3 cafe
« Reply #56 on: November 20, 2016, 01:11:23 PM »
It's been a while. Little pause on the project. I had plans to rebuild the engine this winter, but I will not. It will be done, but not now. But I still have a little to do list.

Wheel bearings
Wheel lacing
Swingarm powdercoat and bushings
New exhaust (old one is full of dents.)
Maybe clip-ons

I was thinking about painting the wheels black, but I'm not sure is it a good thing to do because there are spokes and maybe they can't be adjusted anymore after painting. I bought an old 1.85-19 inch front rim. I had an 18 inch rim on front witch I can now move to rear. My old rear wheel was 16" harley wheel. So I' m getting the oem style now. Bought continental rb2 & k112 tyres to mount on them.


Delkevic makes a nice short exhaust for these bikes and it's stainless and the price is also quite cheap. Original exhaust would be my choise, but those cost a fortune.

So a little update whats going on.

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Offline -JP-

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Re: First build: CB750 K3 cafe
« Reply #57 on: November 29, 2016, 11:48:06 AM »
Yesterday I replaced wheel bearings. Front axle nut was a pain to get off. Lots of heat and hammering and it finally loosened. I also took the wheels out for lacing and swingarm is getting a powdercoat. I also cleaned the rear brake drum and lid.





I still have to figure out what kind of rear shocks should I get. I got spare Konis and I sent them to be serviced. Turned out that rods are damaged and have to be replaced. The coating on the rods is coming off. So they are not sealing properly. If Ikon can't provide the rods as spare parts cheap I have to buy new shocks. I think I stick with Ikons because I like how they look and I have been reading good things about them. And those can be serviced and are quite cheap.

Left one is Koni. The right one is unknown brand:



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Offline -JP-

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Re: First build: CB750 K3 cafe
« Reply #58 on: December 30, 2016, 10:48:00 AM »
I got the swingarm from the powdercoat. Installed bushings for the shocks. I also received exhaust flanges and Ikon shocks. Delkevic exhaust is on it's way.

I would like to clean the rear of the bike. Get rid of the fender and make a new seat. Two seater, but lower. Maybe clip ons too. We'll see...






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Offline riverfever

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Re: First build: CB750 K3 cafe
« Reply #59 on: December 30, 2016, 01:11:13 PM »
Very cool that you and your dad are tackling this together. That paint looks absolutely dynamite! Hey you never mentioned if you got another brake bleeder screw. Do you need one? I have one that is for a 750 which is way bigger than the 550 and I didn't know that years ago when I ordered. Yours if you need it JP.
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Offline -JP-

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Re: First build: CB750 K3 cafe
« Reply #60 on: December 31, 2016, 01:10:06 AM »
Quote from: riverfever on December 30, 2016, 01:11:13 PM
Very cool that you and your dad are tackling this together. That paint looks absolutely dynamite! Hey you never mentioned if you got another brake bleeder screw. Do you need one? I have one that is for a 750 which is way bigger than the 550 and I didn't know that years ago when I ordered. Yours if you need it JP.
Yes, I got a new bleeder screw. It was bigger than the old one, but it works fine. Thanks a lot anyway.

It's been fun to build this bike with my dad. And the project is far from over. We are going to rebuild the engine in the near future. So lot's of hours still left with the bike and the old man.

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Offline -JP-

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Re: First build: CB750 K3 cafe
« Reply #61 on: January 06, 2017, 09:37:54 AM »
Today was painting day. Some sections of the frame were taken a beating so I applied some fresh paint to make it look good again. I'm happy with the result. Tomorrow I will mount the swingarm and those new shocks.



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Offline -JP-

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Re: First build: CB750 K3 cafe
« Reply #62 on: January 19, 2017, 12:39:29 PM »
Wheels laced and rubbers mounted. Some painting with tyre pen. Ikons mounted. These shocks really match the old look of the bike. Tank decal attached. Exhaust will be mounted next.



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Offline -JP-

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Re: First build: CB750 K3 cafe
« Reply #63 on: January 22, 2017, 05:33:06 AM »
Today I installed exhaust system. Like I mentioned it is Delkevic stainless system with shorter silencer. I've read good reviews about this system and how the installation should be peace of cake. Well I had trouble. I managed to get it right but I think one of the headers might be bent just a little bit off. I had a hard time getting the headers in the collector. Finally after 1,5 hours I got it to fit.

The exhaust itself is a quality item for the price. Nice welds etc. There was no instructions with it. Everything was nicely packed. I can't say how it sounds yet, but I like that there is a removable baffle. I left it in place. I rode with straight pipe last summer and the noise was too loud for me. So my ears will probably love this pipe.

I really like the looks of it.













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Offline -JP-

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Re: First build: CB750 K3 cafe
« Reply #64 on: January 22, 2017, 09:27:59 AM »
Thanks for the heads up. I'm no welder but I understand that these welds are not the best on the market. I've had Yoshimura Japan and Racefit systems and those are art compared to this. But for the money these are quite good stuff. Or I suppose...

I tried to put it on just like you discraiped. Loosely. Eventually got it. I almost gave up. Broke one of the springs too. Just snapped. I have to keep an eye on those welds now and then. Thanks.

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Offline -JP-

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Re: First build: CB750 K3 cafe
« Reply #65 on: January 23, 2017, 09:31:04 AM »
There was an old steering damper in the boxes that came with the bike. I used pipe clamp to mount it on the frame. Maybe not the cleanest, but works ok. One question came up. Is it ok to mount this stiff or should it be loose/wobbling a bit?
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Offline -JP-

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Re: First build: CB750 K3 cafe
« Reply #66 on: January 23, 2017, 09:40:57 AM »
I meant that when it's mounted should it be wobbling when you move it by hand. I think modern sportbikes dampers move a little when in place. So they are not stationary or stiff. There is a little play. Maybe I just remember wrong...
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Offline SOHC4 Cafe Racer Fan

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Re: First build: CB750 K3 cafe
« Reply #67 on: January 23, 2017, 11:10:01 AM »
For normal street riding, it should not be so tight that it limits range of movement.  However, it should not be flopping about.
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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 Stev-o

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Re: First build: CB750 K3 cafe
« Reply #68 on: February 12, 2017, 02:27:33 PM »
Quote from: -JP- on January 23, 2017, 09:40:57 AM
I meant that when it's mounted should it be wobbling when you move it by hand.


No.  Mine doesnt....
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'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline -JP-

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Re: First build: CB750 K3 cafe
« Reply #69 on: February 19, 2017, 09:12:57 AM »
I've been looking for a seat for a while. I tried to find good reviews on some but there was not mutch to be found. Of course I could make my own seat, but I don't have the skills or equipment to do so. So the only option for me was to buy one. If only I could find a good one.

Tuffside was a brand that came up and there were some good feedback and the seats looked 10/10. So I contacted them and made an order. There was some special wishes like the passenger strap and they all were included. Chris replied all my messages fast and all in all the customer service couldn't be better.

The seat itself is a quality product. Flawless. Handmade. It is a universal seat so I have to modify the frame to make it fit. That work is still in progress, but I got to fit the seat on it's place and I'm pleased. Wasn't cheap, but worth it. Happy with the color too. I was between dark brown and black.








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Offline JoeCooley

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Re: First build: CB750 K3 cafe
« Reply #70 on: February 19, 2017, 09:51:26 AM »
Nice project. Tuff side seats are the tits!  8)

I picked up a Taiwanese ebay seat from a local guy. It's for a future projects. The quality isn't bad. I think they go for $50 on ebay.
« Last Edit: April 17, 2018, 02:56:19 PM by Glenn Stauffer »
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Offline -JP-

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Re: First build: CB750 K3 cafe
« Reply #71 on: February 21, 2017, 12:04:14 PM »
Today was a welding day. We welded the rear hoop on and some mounting points for the seat. Also a mounting point for the steering damper. I still have to smooth those welds and make holes for the seat mounts. Hope the tire won't hit the frame or the seat when there is load on the bike. Some people have had problems with the clearance.

We also have to think should there be a rear fender or not. How to mount the brake light and maybe relocate the license plate down on the side. So some things still needs to be taken care of but there was good progress today.




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Offline SOHC4 Cafe Racer Fan

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Re: First build: CB750 K3 cafe
« Reply #72 on: February 21, 2017, 12:41:41 PM »
You shouldn't have clearance issues with the hoop, as it is at an upward angle, but you'll want to keep clearance in mind for your taillight/fender.
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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 SOHC4 Cafe Racer Fan

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Re: First build: CB750 K3 cafe
« Reply #73 on: February 21, 2017, 01:44:34 PM »
Have you chosen to go with a 17" rear?
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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 -JP-

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Re: First build: CB750 K3 cafe
« Reply #74 on: February 21, 2017, 08:40:58 PM »
I would rather not go with the 17" wheel. Just laced an 18" rim that I found from ebay. I also have brand new k112 on it so I really hope there is enough clearance.
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