Author Topic: 1975 CB750 K5 Chopper Project  (Read 1044 times)

Offline xriccix

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1975 CB750 K5 Chopper Project
« on: May 22, 2017, 09:36:19 PM »
So here we have what will be my first bike build project and I warn you know I will be learning along the way! It's also worth saying that my wife and I are in the middle of moving from Brighton to Bedford to be closer to family, this will take a while!






That's the bike as it currently sits, I also have 3 boxes of bits which have everything else in.

Things I'd like to do to the bike:
Engine refurb
Paint engine in VHT wrinkle paint
Powder coat frame
King and queen Seat
Bigger sissy bar
Forward controls
Coffin/Peanut tank
Dual Carbs
Springer or Girder front end

Any help or advice about the above list would be greatly appreciated!

« Last Edit: May 29, 2017, 09:20:46 PM by xriccix »

Offline xriccix

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Re: 1975 CB750 K5 Chopper Project
« Reply #1 on: July 29, 2017, 12:47:38 AM »
As I cant work on the bike right now I thought i'd post some pics on parts that I have bought for it :)
 
Springer arrived and I'm super happy with it, needs some work but for the price I paid it was an absolute steal.



Got 4 of these bad boys as well!


Offline MarkCR750

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Re: 1975 CB750 K5 Chopper Project
« Reply #2 on: July 29, 2017, 07:42:38 PM »
Good luck with the project, there aren't many on here with that sort of bike but it's always interesting to see a new machine being created, looks like there's a fair bit to do!.
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Offline Seabeowner

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Re: 1975 CB750 K5 Chopper Project
« Reply #3 on: July 29, 2017, 10:38:11 PM »
Yes choppers are pretty rare these days. It's seems either restore to stock, ride it into the ground or spend, spend on cafe racer with M unit stuff. I remember the likes of Leon Wallace customs in London. At least you can guarantee some help on the engine here and keep the posts and pics coming.
Phil
1971  CB500K0  Candy Jade Green
1973  CB500K1  Candy Ruby Red
1975  CB550F1   Shiny Orange
1978  CB550K     Excel Black

Offline xriccix

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Re: 1975 CB750 K5 Chopper Project
« Reply #4 on: July 31, 2017, 11:52:46 AM »
Good luck with the project, there aren't many on here with that sort of bike but it's always interesting to see a new machine being created, looks like there's a fair bit to do!.

Yes choppers are pretty rare these days. It's seems either restore to stock, ride it into the ground or spend, spend on cafe racer with M unit stuff. I remember the likes of Leon Wallace customs in London. At least you can guarantee some help on the engine here and keep the posts and pics coming.

Cheers boys! I'll update as often as I can!

Offline xriccix

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Re: 1975 CB750 K5 Chopper Project
« Reply #5 on: March 10, 2019, 05:41:06 PM »
So its been a hell of a while, new job and new house took a lot longer to get sorted :)

Small update from me, Garage is now finally ready for the CB750 frame and engine coming out of storage this weekend. Bench was built by my brother in-law and myself, only cost around £50 as he had lots of free wood :). Still not the biggest space but should be fine for what I need.



First job I want to get sorted is the carbs. This is the set that came with the bike, from what I can see right off the bat there are a few missing bits, a couple of nuts, throttle return spring and plate spring setting. The plate I just got from Germany for a stupid price, but oh well! Thinking about Chroming the bowls and maybe painting the screw tops black. 



Apart from being filthy the carbs look good, took the bottoms off and looks clean inside, I'm still debating a full rebuild. I guess it will come down to if i used a bread box or velocity stacks and therefore might need to use different jets.
The options I like are both from http://www.steeldragonperformance.com and sexy as hell.




I'll update again after the frame is on the bench.
« Last Edit: March 10, 2019, 07:12:02 PM by xriccix »

Offline xriccix

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Re: 1975 CB750 K5 Chopper Project
« Reply #6 on: March 10, 2019, 05:45:04 PM »
Went through the big box of bits I got with my bike today. No idea where half of it came from?!




Offline Moorey

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Re: 1975 CB750 K5 Chopper Project
« Reply #7 on: March 10, 2019, 07:09:45 PM »
Nice to see someone doing a chopper.

If its a poll. Dual airboxes for me.  :)

Offline SumpMagnet

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Re: 1975 CB750 K5 Chopper Project
« Reply #8 on: March 10, 2019, 08:52:03 PM »
For the sort of bike you are building, those twin chrome airboxes would certainly look the part.
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Offline xriccix

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Re: 1975 CB750 K5 Chopper Project
« Reply #9 on: August 17, 2019, 06:45:40 PM »
*Update*

Started pulling apart the engine, I noticed the case was damaged as I pulled of the starter cover. Hopefully this isn't to hard to fix?!

I also seem to have lost my shop manual, god knows where it could be! As soon as I get another copy sorted I shall be stripping down further.







Offline Moorey

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Re: 1975 CB750 K5 Chopper Project
« Reply #10 on: August 17, 2019, 08:38:31 PM »
Just look in Aladdin's Cave for manuals.  :)

Offline xriccix

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Re: 1975 CB750 K5 Chopper Project
« Reply #11 on: August 17, 2019, 11:23:36 PM »
Just look in Aladdin's Cave for manuals.  :)

I have it as a PDF, just prefer a hard copy :)

Offline Moorey

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Re: 1975 CB750 K5 Chopper Project
« Reply #12 on: August 17, 2019, 11:43:36 PM »
Break out the printer and encapsulator, easy wipe clean. :D

Offline Rob62

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Re: 1975 CB750 K5 Chopper Project
« Reply #13 on: August 18, 2019, 11:33:05 PM »
I like the look of this, very different to the usual rebuilds.. my vote goes to the velocity stacks..... that top end looks a bit dirty unless its just the photo, maybe a full engine strip down would be a good idea.. Good luck, keep the updates coming!

Offline xriccix

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Re: 1975 CB750 K5 Chopper Project
« Reply #14 on: August 19, 2019, 12:43:37 AM »
I like the look of this, very different to the usual rebuilds.. my vote goes to the velocity stacks..... that top end looks a bit dirty unless its just the photo, maybe a full engine strip down would be a good idea.. Good luck, keep the updates coming!

Thats the plan bro, gonna do a full rebuild, gonna be a challenge :)