CB750 Chopper frame from scratch in

Building a CB750 motorcycle frame from scratch using Frank Wo's plans on Hondachopper.com in a time lapse video.
Music is by Vans in Japan the tracks are Sonic Pogo and Rest Easy, from the KZbin Audio library.
This is the playlist with all of the build videos if you're looking for more detail.
• How to make a bobber i...
#motorcycleframebuild
#bobberbuild
#chopperbuild
#homemademotorcycle

[@shockley7500]

I love that old equipment especially that hacksaw/bandsaw. I've never seen one of those.

[@BuiltatBlackjacks]

The reciprocating hacksaw? They're not uncommon here in England. Saw the exact same model without a motor on it for 99p on E-Bay a few years ago. Get's called the nodding donkey, cause when it's working right I can pop an 8" dia round in there and just let it alone until it's cut through.

[@marcelluswhyte2291]

Excellent! I am just beginning to understand and respect the skills and knowledge that it takes to be a custom motorbike builder. He makes it seem so simple but that the knowledge and skill he has dedicated his life to master. What a craft man!!!!

[@BuiltatBlackjacks]

Thanks.

[@Hedron-Design]

This is why I got a tube notcher lol. Good work man, impressive.

[@sgtboz9730]

Thank you for this. It really helped just watching how you work and make it all happen. Excellent display. Subbed.

[@BuiltatBlackjacks]

Thanks for the sub!

[@greenbudahaz4204]

Man I would love to put this together.. my dad did a 750 chopper back in the 70s and it just looked dope!! Nice ride

[@BuiltatBlackjacks]

Thanks. I've got some to stuff to get on top of, but I will eventually get back to it.

[@tinytim9413]

Crazy skills. Love it!

[@BuiltatBlackjacks]

Thanks man.

[@mrstratau6513]

Excellent.

[@seller559]

Beautiful

[@BuiltatBlackjacks]

Thanks. Can't really take too much credit though as I built it from Frank Wo's plans and he drew those up from a period 70's frame.

[@emmanuelsanchez2159]

Very nice chopper frame, i wish make a frame like this

[@BuiltatBlackjacks]

You can :-)

[@michaelpitts3049]

I wish I had a job there I love them bikes but I javen ever been around anything like that I build houses deep south . But I would love to work in a shop like that be cool as hell

[@BuiltatBlackjacks]

Well, first thing I'd say is think hard before you make your hobby your job. Second thing is it's taking a while but I'm working on some more videos on scratch building a frame, so stay tuned, there's more to come. :-)

[@shockley7500]

I had to pause it at the end just to admire it for a minute.

[@BuiltatBlackjacks]

You're on Hondachopper? That Mr. Shockley? :-) It's built off of the plans that Frank Wo drew and posted on the site. Modified a bit.

[@Makermook]

I did the same :)

[@jurgensen36]

cool master !!

[@filemonsipakkar7746]

thanks uncle

[@BuiltatBlackjacks]

You're welcome. 👍

[@filemonsipakkar7746]

this is a special vidio...i got so much smthing in 06:30 mnute

[@BuiltatBlackjacks]

Good to know. 😁

[@bhoktongchannel9334]

emazing👍

[@Michael-ud4pw]

Awesome

[@BuiltatBlackjacks]

Thanks.

[@paulstanier9736]

Another great video, may benifit from a few more closeup shots? Will you be finishing it?

[@BuiltatBlackjacks]

Hi Paul, the project was mostly about how much use a set of plans are when you build a frame as well as answering a few questions about how you build a frame anyway??? As soon as the Einstein equation allows (I.E. space and time) I'm going to make another series of videos on how to make frame without plans. As for the Honda, well it's staying like that for a while as I don't have the money to go any further with it. Although it'll probably make a reappearance in the upcoming "How to make (insert sheet metal object of choice here)" videos that'll be happening eventually.

[@paulstanier9736]

I will look forward to those.

[@patrishka1476]

where can i get the plans for one?

[@JackEverton101]

First and foremost awesome video! I’m currently trying to make my own, I just don’t have the same kind of tools and equipment. So I was curious what size pipe you used for the frame? And the last question, how did you make the front of the bike/ the part connected to the front wheel and the neck

[@BuiltatBlackjacks]

Firstly it's NOT pipe, it's tube. Pipe is sized by the bore and is used for transporting liquids or gases from one place to another, so it isn't structural. What I used for the frame was 1" (25.4mm) OD 1/8" (3.2mm) wall CFS3 seamless tube. In America you could use DOM tube. Using tube with a visible welded seam along it (ERW) isn't really acceptable as this tends to crack along the weld seam. By the front part of the bike I guess you mean the forks? Those are the Honda forks fitted with longer fork tubes and are from 20years ago. You might still be able to buy them from a company called Forking by Frank in the states. If you want to or have to make your own forks, then girder style forks are about the easiest and safest to make.

[@USA__2023]

@@BuiltatBlackjacks I thought seamless tubing had issues with wall thickness inconsistencies so wouldn't be good for structural. I'm no pro at tubing I just remember it coming up when I was designing something that needed tubing.

[@BuiltatBlackjacks]

@@USA__2023 Think someone was confused there. ERW, or welded seam tube is seldom round and tends to be "harder" either side of the weld, which leads to cracking. Have a look at a steel japanese motorcycle frame and look at all the gussets and where those gussets aren't welded. It's entirely possible to make a frame from ERW, but it isnt going to be as clean if it's going to last. In the USA what you mostly get is DOM (drawn over mandrel) tube which is essentially ERW that's then resized by drawing it over a mandrel. This stress relieves the weld and makes it truly round. It's not actually seamless, but it's closer. The CFS, CDS, or seamless we get in Europe is made by in essence ramming a steel ingot into a funnel with a spike stuck up it. In effect its forged as tube, not rolled into a tube. That's why it comes in random lengths, you also get it in as milled, annealed and normalised conditions. Although the annealed is referred to as "bendable" ideally you want normalised which will happily bend in a half decent bender. That's the nutshell version.

[@rage660]

@@BuiltatBlackjacks 2 cents worth: the choice of tubing ,wall thickness, etc ->>how will the motorcycle be treated, drag race? Some sort of Enduro? Are you stuntin? High speeds quarter mile? High speeds salt flats? BLACKJACK IS DEFINITELY ON POINT WITH HIS INPUT. There are probably a bajillion methods and theories encompassing the subject of frames. But they all pertain to various purposes of that specific bike. What about chromoly tubing? Going pre 1920s and stick welding it together? Not chromoly. SO BEFORE YOU EVER CUT ANY METAL OR DRAW ANY PLANS OR CAD DESIGN... IMHO-> figure out your goal for this build, Tesla would picture everything before he ever did anything. I'm no Tesla but I know my build is going to be low and slow

[@rage660]

@@BuiltatBlackjacks Is it possible to reinforce some schedule 40 standard tube? Long gussets?arch support? Say you had two schedule ⁴⁰ pipes and welded them with their seams together supporting each other? I have even encountered black gas pipe used for small power builds.

[@douglasflavianocalazansmav3236]

Where is the rest ? 🥺

[@Motozarras]

Este é dos bom ❤

[@BuiltatBlackjacks]

Obrigado meu amigo. :-)

[@24R03ma]

Лайк и подписка👏

[@BuiltatBlackjacks]

Спасибо, мой друг

[@popeoftattoos]

Is this modeled after a amen jammer?

[@BuiltatBlackjacks]

It's based on the plans from the Garage section of Hondachopper.com, and those were drawn up from measuring a 70's aftermarket frame. If I recall correctly Amen frames had a shaped plate for the rear motor mounts? This has a bolt in upper rear mount, so I'd say no. Think it might have been a D&D?

[@virginiapetcu8740]

hi blackjack's, my name is Carlo and I wanted to ask you if you sell the chassis of the honda that you made in this video, or is it your personal project made public on video .... I am waiting for an answer .. thanks

[@BuiltatBlackjacks]

I built it for myself and I'm in the UK. There are plans for it that I altered to get there. But, it's only guaranteed to fit a K series Honda CB750 SOHC engine (Won't work with F1 and F2 engines and I'd have doubts about the K7 fitting). I can let you have a set of the altered plans if you like? There's a link under "Contact" to my Email. Drop me a line.

[@jaimelara5559]

maganda sa bike ko yan

[@DavidLee-no9uc]

Are you selling these?

[@timgriffiths2505]

Not currently. But you never know...

[@mikeram0320]

I wanna buy one of these frames u selling them

[@BuiltatBlackjacks]

Unlikely to be selling them. But I've got some plans for it if that's any help? Drop me an Email, I'll see if I can sort them out.

[@donaldlezotte4664]

@@BuiltatBlackjacks would you mind shooting me an email with the plans?

[@BuiltatBlackjacks]

@@donaldlezotte4664 The original plans came from the Garage section of Hondachopper.com. www.hondachopper.com/garage/legion_750frame/legion_750frame.html I re-drew them to account for the different bend radii my bender makes, that required the front lower motor mounts re-drawing, I also changed the rake to suit the forks I had and re-drew the rear axle plates for a 20mm Honda spindle instead of the 5/8" one the original drawing has. It turned out the frame was made in such a way that you have to saw the front upper motor mounts off to get the engine in. So I re-drew it again, and moved the motor back about 3/4" in the frame, yet another lower front mount, and I moved the bottom of the two uprights back 3/4" and left the tops in the same position. If the original drawing isn't working for you, let me know I'll see if I can dig out one of the ones I did when I'm not so busy. 👍

[@FireElectrick]

2:35

[@BuiltatBlackjacks]

The first two and half minutes are spent on FAQ's about making things that people have had in the past. Since its a CB750 you cant really reuse the headstock, you don't need to get axle plates laser cut, and the easiest way to keep seat rails lined up is to build them as a sub assembly with the top tube on the bench.

[@FireElectrick]

@@BuiltatBlackjacks Thank you

[@vidafitnees]

Já tem muito tempo que vc fez sua moto amigo, mas vou postar um comentário, quem sabe vc ainda veja . Então meu comentário seria em torno do doc dela como vc legalizou o doc se é que foi possível. Diga de passagem vc e foda , abrc

[@BuiltatBlackjacks]

Para este eu tenho documentação existente. Mas vai ficar parado por um tempo ainda, pois tenho muitas outras coisas para fazer...

[@michaelroberts5644]

There is no talking.

[@BuiltatBlackjacks]

Because its a montage of the whole video series? The extended Director's Cuts, have talking.

[@milmex317th]

Talk much.

[@BuiltatBlackjacks]

Talking is available here... kzbin.info/www/bejne/fmfMY3h8Yr-Bqck