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Author Topic: CB750 K7 Cafe Racer Build  (Read 10061 times)

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Offline Super Roo

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CB750 K7 Cafe Racer Build
« on: December 26, 2014, 11:23:59 PM »
CB750 K7 Cafe Racer build

I have started working on this cafe racer project about a year ago.
Have finally got the front forks on the bike and about to fit the swingarm.

Bike includes:
915cc engine kit
Ducati 999 front forks
Ducati GT1000 aluminium hum rims
GS1000 aluminium swingarm
Custom made fuel tank, oil tank, and seat


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Offline Super Roo

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Re: CB750 K7 Cafe Racer Build
« Reply #1 on: December 27, 2014, 12:09:17 AM »
The original donor bike and the bike during the tear down process.
« Last Edit: December 27, 2014, 12:11:25 AM by Super Roo »
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Offline Super Roo

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Re: CB750 K7 Cafe Racer Build
« Reply #2 on: December 27, 2014, 12:22:37 AM »
Bending of the rear swingarm loop.
Used compressed sand and an oxy set.
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Offline Super Roo

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Re: CB750 K7 Cafe Racer Build
« Reply #3 on: December 27, 2014, 12:24:30 AM »
Rear loop attached and support brackets installed.
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Offline Super Roo

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Re: CB750 K7 Cafe Racer Build
« Reply #4 on: December 27, 2014, 12:27:00 AM »
Alignment gig used to fit brackets for upper shock mounts.
Modified rear number plate, brake light and indicator support structure.
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Offline Super Roo

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Re: CB750 K7 Cafe Racer Build
« Reply #5 on: December 27, 2014, 12:30:12 AM »
Triple clamp stem machined to suit Ducati 999 forks.
After much struggling with the Ducati 999 triple clamps, I found the stem was threaded in  ;D
Also attached is a mock up of the triple clamps on the bike. 
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Offline Super Roo

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Re: CB750 K7 Cafe Racer Build
« Reply #6 on: December 27, 2014, 12:33:32 AM »
Ducati forks fitted to bike with new stem bearings installed.
I have also fabricated a bracket to mount a digital speedo/ tacho gauge with a bobber style head light mounted upside down from the top of the bracket.
Hopefully it will keep the front of the bike clean looking. 
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Offline Super Roo

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Re: CB750 K7 Cafe Racer Build
« Reply #7 on: December 27, 2014, 12:37:00 AM »
This is where I'm currently up to.
The swingarm has been powder coated, new needle  bearings pressed in and I'm currently in the process of machining and installing some Ertylon bearings for the rear shock mounts. Ertylon absorbs vibration and is self lubricating so hopefully it performs better than the original steel and rubber mount.   
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Offline Riceman

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Re: CB750 K7 Cafe Racer Build
« Reply #8 on: December 27, 2014, 09:49:42 AM »
I like the forks,should perform nicely.
In case you don't have calipers yet I see these Guys
have some,not sure if they are the right year,good price
though.http://www.ebay.com/itm/FRONT-BRAKE-CALIPERS-BREMBO-M750IE-750-750-IE-MONSTER-DUCATI-02-03-Y-/400666048648
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Offline Super Roo

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Re: CB750 K7 Cafe Racer Build
« Reply #9 on: December 30, 2014, 02:11:22 AM »
Luckily I got the forks complete with the clip ons, leavers and brakes.
The Ducati GT1000 rim is a direct fit with the Ducati 999 forks.
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Offline Super Roo

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Re: CB750 K7 Cafe Racer Build
« Reply #10 on: December 30, 2014, 02:18:50 AM »
Got the swingarm fitted today.
A bit of messing around to get the shims/ spacers on the smaller width swingarm mount.
Was happy the top shock mounts are correctly spaced.
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Offline Super Roo

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Re: CB750 K7 Cafe Racer Build
« Reply #11 on: January 18, 2015, 05:25:13 AM »
Fitted the front head light and instrument support.
Just have to shorten the fixing bolts at some point.
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Offline Super Roo

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Re: CB750 K7 Cafe Racer Build
« Reply #12 on: January 18, 2015, 05:27:17 AM »
Walked in to the shed to work on the bike and found this little critter admiring my handy work :D
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Offline Super Roo

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Re: CB750 K7 Cafe Racer Build
« Reply #13 on: January 18, 2015, 05:32:24 AM »
Worked on fitting up the wheels today.
The Ducati GT1000 front wheel is not a direct fit to the Ducati 999 forks.
The spokes on the rim lightly hit the brake calliper, so I sanded a small section off.
The brake callipers also need a 1mm washer to pack the calliper inwards.
The 180 rear tyre is looking a lot fatter than the original rear tyre.
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Offline welard

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Re: CB750 K7 Cafe Racer Build
« Reply #14 on: January 18, 2015, 07:19:53 AM »
180 rear tire goes into the stock swing arm???
No rear brake???
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Offline Davidov

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Re: CB750 K7 Cafe Racer Build
« Reply #15 on: January 18, 2015, 08:10:33 AM »
Nice fabrication work
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-David

Offline SOHC4 Cafe Racer Fan

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Re: CB750 K7 Cafe Racer Build
« Reply #16 on: January 18, 2015, 10:02:07 AM »
Quote from: welard on January 18, 2015, 07:19:53 AM
180 rear tire goes into the stock swing arm???
No rear brake???
See first post. GS1000 swingarm.
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"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)

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Offline Super Roo

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Re: CB750 K7 Cafe Racer Build
« Reply #17 on: January 18, 2015, 06:31:17 PM »
I have modified the GS1000 swingarm slightly.
The GS1000 swingarm only just fits a 180 tyre.
You can see the rear brake calliper under mounted in the darker photo above.
I'm still deciding if I want to under mount the calliper or have it top mounted.
I haven't put all the pieces on the rear wheel yet as I have to machine spacers for the rear wheel.
The rear calliper I have is supported using a pin through the swingarm, not a strap.
So the rear of the bike is a little cleaner looking.

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Offline welard

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Re: CB750 K7 Cafe Racer Build
« Reply #18 on: January 20, 2015, 08:39:06 PM »
Quote from: CB750 Cafe Racer Fan on January 18, 2015, 10:02:07 AM
Quote from: welard on January 18, 2015, 07:19:53 AM
180 rear tire goes into the stock swing arm???
No rear brake???
See first post. GS1000 swingarm.

Thank you, I totally breezed past it in the first post.

Is this the same modification the Retro Rocket has made to his bikes??

See, I'm interested in the 180mm rear tyre but had resigned to just a 150mm in the standard F1 swing arm.

Hey Super Roo and chance of getting a bit more detail in the fitment of the Suzuki swing arm, or is it actually as easy as you have described here???

Thanks

Pete
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Offline Super Roo

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Re: CB750 K7 Cafe Racer Build
« Reply #19 on: January 21, 2015, 09:31:20 PM »
I got the idea for the GS1000 swingarm from a post Terry was discussing.

The GS1000 swingarm is longer than the standard swingarm by an inch or 2.
I had to drill out the frame swingarm pivot bolt to suit the 18mm diameter bolt.
The swingarm bearing section is slightly smaller than the frame so I machined a packing shim and used a nylon washer to fit the swingarm into the frame snugly.

I'm unsure about fitment of the shock absorber between the stock frame and the GS1000 swingarm.
I have modified the frame similar to a post on benji's cafe parts page.

As can be seen in the attached drawing I have modeled the modifications to the bike before making the changes.
There are issues with ground clearance with changing to modern forks.
With the suspension fully bottomed out I think I still have 50mm clearance between the exhaust and ground.
 
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Offline MFHP

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Re: CB750 K7 Cafe Racer Build
« Reply #20 on: January 22, 2015, 03:11:14 AM »
Wow! What a great build. Just can't wait to see this finished
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Offline Super Roo

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Re: CB750 K7 Cafe Racer Build
« Reply #21 on: June 07, 2015, 04:05:12 AM »
Have made slow progress lately, but getting back into the swing of getting the project moving again.
Have completed an aluminium tray to mount all of the electrical components.
I am concerned the battery might hit the seat cowl, but the hold down support can be modified to slightly move the battery as required.
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Offline Super Roo

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Re: CB750 K7 Cafe Racer Build
« Reply #22 on: June 07, 2015, 04:09:42 AM »
Have also started making the rear cowl section.
So far I have made a foam mold using refrigerator foam sheeting and roughly shaped the mold to the shape I wanted.
Just need to give a final sand and the mold is ready to fiber glass.
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Offline Super Roo

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Re: CB750 K7 Cafe Racer Build
« Reply #23 on: June 07, 2015, 04:13:58 AM »
Have drawn up an aluminum oil tank to get fabricated.
My own attempts at making a steel tank failed.
Was all going well until I went to weld on the pipe fittings and the concentrated heat warped the tank.
At least getting someone else to make it will be quicker.
Need to get this beast moving!
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Offline Super Roo

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Re: CB750 K7 Cafe Racer Build
« Reply #24 on: June 07, 2015, 04:16:42 AM »
I have also dropped the head off at a machine shop to get work.
The new 915cc sleaves inserted into the block and all of the engine bead blasted.
With the exception of the rocket cover which I plan to get polished.
Can't wait to get these parts back, as the engine is the final piece of the puzzle to getting the bike complete.
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