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 74 CB750 chopper build

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jedi



Posts : 6
Join date : 2011-04-14

PostSubject: 74 CB750 chopper build   Thu Apr 14, 2011 7:22 pm

Here's the Honda project which I hope can run in the build off. Designed the frame in Solidworks and had it lasercut, the rest I bent up with 1.5 tube.
The springer is almost done apart from some chrome and powdercoat.
The oiltank is "see thru" and this weekend I'll finish the end caps for it which are bronze..
There's still some welding on the frame to finish off which gets done when I pull the springer apart.
The motor is just a shell which I'll completely rebuild.
The pictures are not quite up to date as I have now made the handle bars, the ones you see are not bars but a rod to push it about the shop.
The rear is a 240 which I'm running a belt back to a pulley/sprocket back to the motor, that part is almost done and I'll take pictures as I go.
I have a ton of build pictures form the beginning and if anyone wants anything i can post it.



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brett7777
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PostSubject: Re: 74 CB750 chopper build   Thu Apr 14, 2011 9:55 pm

jedi wrote:

I have a ton of build pictures form the beginning and if anyone wants anything i can post it.

yeah post some more!
very cool & original & a heap of engineering work goin on there, now you got me interested, the XVS1100 is mean looking too
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mike
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PostSubject: Re: 74 CB750 chopper build   Fri Apr 15, 2011 1:50 pm

welcome
wow thats impressive a lot ov detail goin on there Twisted Evil
the springer looks cool based on the CBH plans? im making one around the same plans and wondering were u got the springs from??
the more photos the better i reckon
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jedi



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PostSubject: Re: 74 CB750 chopper build   Sat Apr 16, 2011 5:34 pm

mike wrote:
welcome
wow thats impressive a lot ov detail goin on there Twisted Evil
the springer looks cool based on the CBH plans? im making one around the same plans and wondering were u got the springs from??
the more photos the better i reckon

The springer is loosely based on the plans, I used the dxf files to profile the parts and then I engineered the bits as I went along.
The springs are available from Ebay, you see them there all the time but I got mine from 45 restoration company (USA).

It might not look much different from recent pics but a fair amount of work went into it the past couple of days.
Bars are bent up, front axle is finished with bearing spacers and bushes for the springer brake.The disc is in position and I'm in the process of making up a mount plate/bracket for the caliper arm to run a tie rod back to the rear legs of the springer.The caliper and arm are from a Vmax which I know is easy to work with running a Harley type disc.
Made a brass sleeve for the kick start and made a threaded cross tube and machined the end covers fro the oil tank so they can be bolted to the tube.
Next up after that is to make the rear axle.


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brett7777
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PostSubject: Re: 74 CB750 chopper build   Sat Apr 16, 2011 7:18 pm

your bike looks freakin mean mate
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Irishjon
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PostSubject: Re: 74 CB750 chopper build   Sat Apr 16, 2011 7:37 pm

Fast progress Sam. I'll move some pics to the Grinderfest blog tomorrow. You've got some impressive machinery in your shop. I've got shop envy.

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mike
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PostSubject: Re: 74 CB750 chopper build   Wed Apr 27, 2011 6:32 pm

yeah ide be intrested in some more pics ov ya springer in the build if ya wouldnt mind Suspect
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jedi



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PostSubject: Re: 74 CB750 chopper build   Wed Apr 27, 2011 7:28 pm

mike wrote:
yeah ide be intrested in some more pics ov ya springer in the build if ya wouldnt mind Suspect

I used dxf files and profile cut (water-cut) the yokes and rockers, made 2 of everything so I can do another for another build.
Springs are from 45 restoration company USA.
From there I drilled and milled the appropriate holes almost to size but we also have a spark eroder which I used to size and countersink many of the holes. This works out great because it's extremely accurate. The good thing about making the springer is it's self jigging so to speak. If the bits are accurately made it will all fit together and can be welded without hardly doing anything without fancy clamps etc all over the place.
I didn't use spuds as many plans call for, I milled slots in the legs and have used generic shoulder bolts running through bronze bushes in the rockers. The only welds are on the spring perch, rear legs to bottom yoke plus the bottom of the head stem . In reality none of welds on mine are critical structural weld points. The spring seats were machined from bronze and aluminium




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mike
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PostSubject: Re: 74 CB750 chopper build   Wed Apr 27, 2011 7:58 pm

awsome thanks for the speedy reply Laughing
it looks like your in the right job to be making such things :twisted:also looks like youve put a hell ov a lot ov work into and it payed off
i think im gona make a start on mine this weekend just gathering up the last bits nd peices
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jedi



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PostSubject: Re: 74 CB750 chopper build   Sun May 01, 2011 12:50 pm

Made the axle and spacers, got the belt on to check setup and all is working well.

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PostSubject: Re: 74 CB750 chopper build   Today at 11:20 am

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