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Author Topic: 1975 UK CB750k2 cafe build  (Read 263 times)

Offline BenHolmes21

  • Posts: 8
1975 UK CB750k2 cafe build
« on: Jun 16, 2018, 09:36:07 »
Hi 👋🏻

Thought Iíd finally get round to making a thread on here for my CB750 build after being on here a while looking at everyone elseís build.

I bought the bike in January 18 looking like this and although fairly original, it had been sat a long time after a partial restoration and under closer inspection, it wasnít quite as immaculate as it appears on the photos!

Offline BenHolmes21

  • Posts: 8
Re: 1975 UK CB750k2 cafe build
« Reply #1 on: Jun 16, 2018, 09:38:25 »
Within a week the bike was stripped fully whilst I worked out which way I was going to go as I really like the mix of cafe/brat bikes.

The rear of the frame was cut and an upswept hoop added, ready for moulding a fibreglass hump and aluminium seat pan.

The tank was blasted at work, which I found had a good few dents in, hidden by filler so plenty of new parts have been ordered from 4into1  which I shall update with as I am currently waiting on that much Iíve lost track of whatís actually been ordered. I treated it to a replacement exhaust as the black one was a bit rough and didnít quite fit with the look I wanted so opted for a Delkevic stainless system and a new throttle assembly for minimal hand controls too.

I also shaved the top yoke/clamp as I wanted a minimal cockpit but this has now been sold as Iíve replaced it with a billet one from Cognito Moto

Offline BenHolmes21

  • Posts: 8
1975 UK CB750k2 cafe build
« Reply #2 on: Jun 16, 2018, 09:40:19 »
When welding the hoop, I turned two plugs and plug welded them into the hoop and frame then seam welded them.

I didnít want to leave an open gusset so shortened the original sheet metal shock gusset and welded them back on, so they just need the welds fettling to smooth them out.
« Last Edit: Jun 16, 2018, 09:42:50 by BenHolmes21 »

Online rohalloran

  • Posts: 14
Re: 1975 UK CB750k2 cafe build
« Reply #3 on: Jun 16, 2018, 16:17:46 »
Good start. Rebuilding one myself so looking forward to following your build.

Offline BenHolmes21

  • Posts: 8
Re: 1975 UK CB750k2 cafe build
« Reply #4 on: Jun 17, 2018, 06:18:35 »
Good start. Rebuilding one myself so looking forward to following your build.

Thanks!! Iíll keep my eyes out for yours on here too! When I bought mine, I said... itíll just be a quick project and more something to tinker with and itís slowly spiralled deeper into a full strip down!


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Online rohalloran

  • Posts: 14
Re: 1975 UK CB750k2 cafe build
« Reply #5 on: Jun 17, 2018, 16:09:19 »
Thanks!! Iíll keep my eyes out for yours on here too! When I bought mine, I said... itíll just be a quick project and more something to tinker with and itís slowly spiralled deeper into a full strip down!

All Mine end up like that :-)

Offline The Limey

  • Posts: 398
  • Evil English Villain
Re: 1975 UK CB750k2 cafe build
« Reply #6 on: Jun 17, 2018, 18:20:36 »
It's structurally advantageous to have an open gusset, less chance of cracking.  That said, I can't see that area taking such stresses so looks are probably a worthy priority. 

It's just my opinion, for course, but brat style set ups never look quite right on big bikes.  Some derivative of a cafe style arse end would look much nicer.
I was born a rocker.  I'll die a rocker.  And I'm proud of it.

Offline BenHolmes21

  • Posts: 8
Re: 1975 UK CB750k2 cafe build
« Reply #7 on: Jun 18, 2018, 04:26:04 »
The decision was purely aesthetic not to leave the gusset open, although I knew keeping a rad on the gusset would improve the strength and less chance of cracks propagating on a radius, but thanks for the heads up

I totally agree with you on the rear hoop but the plan is to even out the look by shaping a rear cafe hump to hide the battery in eventually.

Currently making an undertray to weld in with the seat rails and then I can focus on getting messy with the fibreglass hump.


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Offline BenHolmes21

  • Posts: 8
1975 UK CB750k2 cafe build
« Reply #8 on: Today at 04:52:13 »
This evening I managed to beat the bush... so to speak. Removed the rear shock bushes and also swingarm bushes. I had already shaved the chain guard mounts off, so now the swingarm is ready to go to powder coat and waiting new phosphor bronze ones from TwoWheelFrank.





Also, hereís the stem Iíve just finished. I have a billet top yoke from Cognito Moto waiting to go on. Iíve removed the switch block and polished it to match as Iím using a new master cylinder/lever with an integrated switch.




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