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Messages - CR21
16
« on: October 20, 2019, 09:19:08 PM »
In my view, there are a handful of important parts that really 'make' the CR replica true to the original bike: - Fuel tank - Exhaust system - Fairing shape, style, fitment and screen - And finally the rear hub: The CR750 was produced as a works machine for Honda to demonstrate the advanced performance that the new model was about to bring to the market. The main campaign for doing so was at the Daytona in 1970, where Dick Mann ended up finishing first, other team members (and breakdowns) aside it was an impressive feat. A very iconic part of the Daytona winning bike, and the subsequent CR kit bikes was the twin leading shoe rear brake This rear hub was cast in magnesium, but that did not make it light! A company in Italy used to make a replica of the CR rear hubs, which looked very smart in the images I have seen online but were very expensive and are lo longer available. A CR 'guru' in the UK also made a batch around 10 years ago. I was going to make a replica of the rear hub by scaling photographs and begging for measurements however this has never really excited me as it was replicating a replica and would only ever be a tribute rather than a detailed replica part. Cut a long story short, after some serious looking I found an original part:   Another bit of this jigsaw started. Also purchased the ignition for the bike so I can start to think about coil and CDI unit lugs:  Although this was expensive, it is nicely made and is rated pretty well. Cheers, CR21
17
« on: October 18, 2019, 11:35:47 AM »
Quick 3D print of the breather box:   This will allow me to mock it up on the bike to check clearances with the seat etc Cheers, CR21
18
« on: October 15, 2019, 03:35:50 PM »
Can't wait to see this part getting shape!
Thanks Nap! Cheers, CR21
19
« on: October 13, 2019, 10:33:54 PM »
The oil catch tank or 'Sniffer box' as some people call it, is quite the point of controversy across forums! The one that I drew up and 3D printed was a copy of a copy. This was created over in France by a chap who has built a few replicas, however it does not seem to be as accurate as I originally thought. Another CR guru (thanks if you are reading!) has steered me towards a more correct design, based on some old images and notes from the factory bikes. It looks a little different now! Ref image 1  Ref image 2  Apparently two versions of this tank were available. The side breather/exhaust was apparently what was at Daytona and on the works bikes. I imagine this was to do with the short seat.   And the rear breather on the kit bikes:  As I am creating a CR works style bike replicating the Daytona winning bike, I will be going for the side exit catch tank variant. I will probably make up a 'buck' to create the radii on the edges, and roll a piece in the centre to match, then spring bend the inlet/outlets. The original notes show some baffles as well so it would be good to build these in. It is so difficult with these bikes to be 'accurate' as the bikes that were at Daytona were all slightly different, the 'kit' bikes had a variety superseded parts across the years and of course there are a few replicas out there. Another can of worms is the oil tank brackets  Cheers, CR21
20
« on: October 07, 2019, 10:18:55 PM »
Hi all, I am gathering parts at the moment for a push on the rolling chassis. I have a week off soon and the plan is to focus on the rolling chassis to progress that along so that I can properly start the dry build. Hopefully I can kick some life back into this thread! Oil catch tank: A little progress on the oil catch tank, this is located underneath the seat of the works CR750. This is the type of tank I will be replicating:  Thanks to Eric for the info! Modelled up in CAD a while ago:  I ran a 3D print off in a draft resin (quick and cheap! around 2 hrs build time) to check fitment and clearances before fabricating in Aluminium. As the part is going to be made from thin aluminium I thickened the walls for the 3D print and split it into to pieces, for ease of printing:   I have seen a few different types of tanks, so will do a little more research before starting! Cheers, CR21
21
« on: July 30, 2019, 10:15:58 PM »
Thanks for the replies guys! Rob - it certainly did amazing sound  Yes they do look a little home-cast! Phil - your rep is a lovely bike and you have done it remarkably quickly, its great that we have all met through these builds and have managed to help one another. Thanks Phil with a bit of luck it will turn out alright! Cheers, CR21
22
« on: July 29, 2019, 09:25:51 AM »
Digging this project back up after a long time doing other things! I still have a huge list of things to do and I am working through this, but it has been handy to have a break in order to properly research some aspects of the build. A big part of kicking off the project was a chance to see an extremely well done CR750 replica at Mallory Park. This was built by Eric who I got in touch with through this forum. As I am sure many members are aware, the attention to detail on this build is fantastic, the project has taken a long time to get right but was well worth it. It both looks and sounds spectacular. If my bike turns out anything like this I will be very pleased!  The weather was a little soggy earlier on in the day when I took the 'detail' images:      Please see the start up video below (sound on!) https://www.flickr.com/photos/139374148@N06/48402396316/I also met another chap who I have been dealing with for a long time during this project, he took along his Honda 750 race bike which is kitted out with many genuine original CR750 honda parts. Including the tank, rear wheel, front hub and carbs.     I also picked up a brand new copy of the October 1970 'Cycle' magazine which I have been searching for for a while.     Hopefully I will be able to provide some more regular updates on various parts of the project soon. I would really like to get a rolling chassis complete this year. Cheers! CR21
23
« on: February 27, 2018, 12:53:57 PM »
The bike itself isn't progressing much since I've completed it to about 90%.
But I've been able to obtain a dozen or so NOS 970 and 971 items, for most parts I've got some spares so I decided to build a second bike while I'm still at it.
That sounds like a good plan 
24
« on: February 18, 2018, 04:13:48 PM »
Hi, your build sure is coming along nicely!
Thanks Nap, how is yours coming along?! CR21
25
« on: February 08, 2018, 10:44:43 AM »
CR21, Phil Ward in Wigan linked me up with this thread and I must say, it made a very interesting read, good luck with getting it up and running.
Sam.
Hi Sam, thanks!
As a general update - the progress is super slow as I have been absorbed into a very special Yamaha build! However, I am planning on making some progress this year with the aim of completing the rolling chassis.
Cheers,
CR21
No problem mate, some builds take a lot more time than what we thought they would in the first place.
At the moment, I'm involved with a very large project rebuilding two very famous drag bikes from the 70s.
The projects have been on going for just over 6 years now, haha, but the end is looking close to being in sight now.
Would you like to tackle putting this mess back in shape. haha.
Awesome - yes I would like to tackle that!! Do you have a thread about this?! It's frustrating, but my goal is classic TT 2020, and that will happen Just need to finish the Yamaha and two other restorations to be able to find the time first! Cheers, CR21
26
« on: February 08, 2018, 10:15:20 AM »
CR21, Phil Ward in Wigan linked me up with this thread and I must say, it made a very interesting read, good luck with getting it up and running.
Sam.
Hi Sam, thanks! As a general update - the progress is super slow as I have been absorbed into a very special Yamaha build! However, I am planning on making some progress this year with the aim of completing the rolling chassis. Cheers, CR21
27
« on: November 10, 2017, 02:36:19 PM »
Fuel Tap of great interest
may I ask where it comes from ?
pm sent
28
« on: November 08, 2017, 04:47:33 PM »
Well just a bit to add really, I have been busy with my Rickman build and have now built its engine as well as the engine for the CR750.
I have been patiently waiting for the tank to be made by Holtworks and have been assured it will be very soon ( 36 weeks now ). I'll die of old age before I get it me thinks.
The colour has been decided so when the tank arrives it will all be painted, seat fairing and tank. Yet to source the front mudguard though
Great news! What information do you have on the colour? Cheers CR21
29
« on: November 01, 2017, 09:52:14 AM »
A quick update. Some small parts machined up: Gear changeover bush to hold the olive:   Seat hooks for welding onto the cross brace:  Front brake splitter:  Cheers, CR21
30
« on: October 18, 2017, 06:53:19 AM »
It arrived OK then?
Yes thanks. I sent you an email on Monday
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