CR750 replica build

[Sifu]

Absolutely amazing  : what a great read

[Oddjob]

Did you read the post on the USA forum Scott about the fella who restored a CR750 and got to meet Jay Leno as a result, Jay took the CR750 out for a spin and did a running commentary on it as he did so. Maybe when it's finished you could message him and see if he'd be interested in a better version of the same bike. The USA restoration was good but yours is better IMO. The CR750 ride etc appeared on YouTube IIRC.

[CR21]

Hi chaps,

Thanks for the kind words!

Oddjob - yes I remember watching that video - very cool.

Rear brake cable with works replica hardware complete:



Cheers,
CR21

[philward]

Glad you got back to it Scott! Fantastic quality of work.

[Rozabikes Tim]

Hi chaps,

Thanks for the kind words!

Oddjob - yes I remember watching that video - very cool.

Rear brake cable with works replica hardware complete:



Cheers,
CR21

Again stunning. What was the purpose of the small holes in the nuts? Lock wiring, surely not weight saving, or just to look mega cool?

[taysidedragon]

Almost everything on a race bike is lockwired Tim.

[Rozabikes Tim]

Low level club racing I did - sump plug, oil filter housing bolt, dip stick a few other bits. Whatever sure different with the high level stuff with the CR's,  just adds to the art in any case!

[JamesH]

Hi chaps,

Thanks for the kind words!

Oddjob - yes I remember watching that video - very cool.

Rear brake cable with works replica hardware complete:



Cheers,
CR21

Stunning as always Scott. How did you replicate the crimp finish on the cable ferrule? Did you have to make a specific crimp tool?


Sent from my iPhone using Tapatalk Pro

[CR21]

Hi Tim,

Yes for lockwire, many of the '970' parts for the CR had the provision for lockwiring, a must for scutineering in some places.

Thanks James - I was not brave enough to do the crimping so a local cable manufacturer helped out with that 

Cheers,
CR21

[CR21]

Another piece of the jigsaw for this build is the oil cooler, located underneath the headstock.

A extract from the ACU homologation files shows quite a small 3 core cooler:



I was able to borrow an original cooler which was super handy to use as a reference for the sizing and details, shown here at the back alongside some potential donor coolers. The temptation to use/adapt these is pretty high, however neither fit correctly which is a shame.



Unfortunately the donors are very close in style but are not suitable size wise.

Modelled up in CAD, along with the bracket which attaches to the original horn mount:



Machined nuts:




Currenly on the 3D printer for a fit check, I will attach the machined nuts and bracket to check against the frame



The plan is to engage with a specialist manufacturer to help out with this part, they will work to my 3D drawings once I am happy with the fitment - a tricky part to get right!


Also an epic shot of Dick Mann coming over the finish line at Daytona in 1970, this project is taking a while but I must keep reminding myself - the devil is in the details!



Cheers
CR21

[CR21]

3D prints came out well, ready for the fit check at the weekend, I think the tubes will need some adjustment. These basic prints are very cost effective, the material cost is around £2!





If I need to adjust the tubes I can warm up and adjust the prototype and then work that back into the 3D model.

Cheers
CR21

[Laverda Dave]

Amazing work yet again. How do you find the time to do this fantastic build!
I'd really like to see the finished article ridden by one of the magazines, get Alan Cathcart to test it👍.

[CR21]

Amazing work yet again. How do you find the time to do this fantastic build!
I'd really like to see the finished article ridden by one of the magazines, get Alan Cathcart to test it👍.

Thanks Dave - as I have other comittments and builds on it is super slow - my first post on this thread was in 2016!

That would be great - perhaps one day!

Cheers,
CR21