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Author Topic: First build: CB750 K3 cafe  (Read 19716 times)

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Offline SOHC4 Cafe Racer Fan

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Re: First build: CB750 K3 cafe
« Reply #75 on: February 21, 2017, 09:49:33 PM »
Quote from: -JP- 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.

You should be ok with a 18" wheel as to the hoop.  You may need to watch anything you mount below 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 -JP-

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Re: First build: CB750 K3 cafe
« Reply #76 on: February 24, 2017, 09:52:51 AM »
I put the rear wheel back on just to see how it clears. I think it will be ok. Fenderless. Not sure what is the case if I put a fender on. Looking good with the seat.





-JP-
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Offline SOHC4 Cafe Racer Fan

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Re: First build: CB750 K3 cafe
« Reply #77 on: February 24, 2017, 10:18:15 AM »
Are you going to keep an inner fender, so water and road grime doesn't get all over your electronics?
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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 #78 on: February 24, 2017, 10:21:36 AM »
Yes, I'm keeping the plastic one. Just have to chop it to size.
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Offline SOHC4 Cafe Racer Fan

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Re: First build: CB750 K3 cafe
« Reply #79 on: February 24, 2017, 10:30:29 AM »
Quote from: -JP- on February 24, 2017, 10:21:36 AM
Yes, I'm keeping the plastic one. Just have to chop it to size.

I figured as much.  I've seen bikes that don't run any rear fenders and (even in California) the electronics look dirty and haggard.
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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 #80 on: March 02, 2017, 11:34:50 PM »
Steering damper mounted and just trying to fit the rear light on. Looks really nice. That's the cleanest version I could come up with. Hopefully the wheel won't hit it.





-JP-
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Offline 540nova

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Re: First build: CB750 K3 cafe
« Reply #81 on: March 03, 2017, 01:00:51 AM »
Personally, I'd install a Tarozzi fork brace before a stabilizer.


Sent from my iPhone using Tapatalk
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Offline -JP-

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Re: First build: CB750 K3 cafe
« Reply #82 on: March 03, 2017, 01:56:36 AM »
Front fender is off waiting to be cutted smaller. So it will not be ridden without it.
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Offline -JP-

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Re: First build: CB750 K3 cafe
« Reply #83 on: March 24, 2017, 04:35:36 AM »
Waiting some parts to arrive so it was time to make brackets for the rear turn signals. I also painted that emblem on the left cover.

I have to replace the front brake hydraulic pressure switch. It somehow stopped working during winter. License plate light has to be sorted out. I've seen some people riding already here in Finland. Still too cold for me. Maybe a month and it will be a season start.




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Offline -JP-

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Re: First build: CB750 K3 cafe
« Reply #84 on: April 06, 2017, 07:01:22 AM »
I got everything back together. Side mounted the license plate and did wiring for the plate light. Looks good now. I also tried to start it, but it didn't idle well. It was firing all cylinders but something is not right. It ran with choke ok, but after I closed it the bike shut down. There was this sticky stuff coming out of the carb bowls. Drained it and opened it. Clean and the gas was clean too. Also the fuel filter was clean. Maybe the stuff is gasket sealant. Maybe. That won't explain why there is that same stuff on the air screw. Overall happy how the tail section looks now when all is done. Just have to figure out this running problem.

I tried also another mirror on as you can see from the pictures. I think I stick with the bar end ones...

-JP-
« Last Edit: November 27, 2018, 11:09:08 AM by -JP- »
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Offline -JP-

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Re: First build: CB750 K3 cafe
« Reply #85 on: April 06, 2017, 08:59:54 AM »
Ok. Thanks. Will do.


« Last Edit: November 27, 2018, 11:10:14 AM by -JP- »
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Offline SOHC4 Cafe Racer Fan

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Re: First build: CB750 K3 cafe
« Reply #86 on: April 06, 2017, 09:54:01 AM »
That goo looks like varnished gas.  You might want to re-clean (ultrasound) your carbs again, too.
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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 #87 on: December 03, 2018, 09:22:50 AM »
Time for an update. Almost forgot that I had this build thread going on. Some new things coming up for the bike. Some have been done so a quick catch up before we move ahead.

It's been two summers that I haven't done anything for the bike. No new mods. Nothing. I've rode it and it served well. No big issues. After this last season I tackled a problem that I had with Hondaman ignition. I couldn't get it to fire cylinders 2 & 3 and I gave up and just left it on the bike and rode without it these two summers. Now I had the motivation to get back at it again and solved the problem with Mark.  I had to send the part back to Mark and there was most likely a faulty transistor in the unit. I got a warranty replacement and it worked like it should.

I also had a tire clearance issue with my back tire hitting beneath the seat in bigger bumps so I had to find longer shocks. Well, my Ikons were brand new so I just made them longer. Maybe not the nicest looking option, but I'm happy with the result. Reinforced those welds with an extra plate on the outside of the fork. I gained about 20mm more height. Tyre has now enough room.

So, what to do next. I'm trying to lower those gauges next. I have clipons waiting to be mounted and those gauges stand too upright with them to my taste. I'm trying to keep the old gauges because I like the old worn look of them. Only problem is that they mount like the early ones. Not beneath. I have to figure out somekind of bracket for them. I allready have k5 top triple waiting so I don't have to modify this "rhino" type triple. I just hope the k5 part fits.

-JP-
« Last Edit: December 03, 2018, 09:25:14 AM by -JP- »
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Offline 754

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Re: First build: CB750 K3 cafe
« Reply #88 on: December 03, 2018, 10:19:54 AM »
They make aluminum shock extenders, that you can remove if need be.
 You also could have put a second bumper or spacer in the shock  but it reduces travel.
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Offline -JP-

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Re: First build: CB750 K3 cafe
« Reply #89 on: February 21, 2019, 05:54:22 AM »
On going task was to lower those gauges. I bought newer top triple ('75 maybe) and measured a bracket. Bracket was waterjet cutted from 5mm aluminium plate. Then bended in industrial press. About 7 degree angle.

Bracket is now waiting to be powdercoated, but will post pictures when assembled.
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Offline -JP-

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Re: First build: CB750 K3 cafe
« Reply #90 on: March 30, 2019, 10:33:21 AM »
Getting there. Waiting for Woodcraft clip-ons and then it's time to put things together and hit the road.
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Offline -JP-

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Re: First build: CB750 K3 cafe
« Reply #91 on: April 11, 2019, 04:07:46 AM »
Little setbacks rised. When I changed to clip-ons old cables were too long. So I managed to make the clutch cable to correct lenght but throttle cables were and are problematic. I think I have to order shorter ones. I just can't find a way to reroute them or make them shorter without destroying them.

Another issue is a small oil leak from the mission/left cover area. Tought it was the cover leaking but there is an old damage in the crankcase. Chain has snapped and hit the case and broke a hole in it. It has been repaired with JB weld or something and it is not sealing properly anymore. So I cleaned the old stuff with dremel as well as I could and patched it with chemical metal. Temporary fix and I hope it doesn't leak anymore. I will get it to welder and fix it properly when I get the engine off the bike.
« Last Edit: April 11, 2019, 02:53:11 PM by -JP- »
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Offline Racegun

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Re: First build: CB750 K3 cafe
« Reply #92 on: April 11, 2019, 02:49:46 PM »
Quote from: -JP- on April 09, 2016, 12:13:29 AM
Previous owner mentioned that he put bigger jets in, but I`m not sure what size so I have to contact the guy. This carburator thing is a bit dark zone to me. I have to look in to that after I got the front end sorted out.



Don't be intimidated by the carburetors they are fairly simple. Pull them off carefully as to not tear the insulator boots....drain the bowls first of course. Put it on your bench bowls up and pulls the bowls off...be careful of the gasket so you don't break it. You should see two jets in each... an idle jet (slow jet) and a main jet. Their sizes are stamped on the sides of them.

Easy peasy
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Offline -JP-

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Re: First build: CB750 K3 cafe
« Reply #93 on: April 14, 2019, 12:01:08 PM »
Got the headlight back on. Happy with the result how the gauge lowering turned out. Yellow headlight also looks quite nice.

Waiting for throttle cables to arrive and then it's time to put the tank back on and start this thing. 
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