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CR750 replica build
CR21:
Quick update:
Speedo adapter plate sitting in place nicely ;) Front end fitted with double disks. Really easy 'upgrade' as the fork lowers have bosses, it is just a matter of sourcing a 'mirrored' bracket, disk, caliper and carrying arm and bolting it on along with the modded speedo plate.
I still need to work out the hole drilling and skimming of these disks, and reevaluate whether they need shimming or not. I have read on a couple of forums that the set-up that I have done needs shimming, however as the caliper arms sit at the moment they are parallel to the disk, and I believe that they should function as intended.
To complete the 'front end brake set-up' I need to do the following:
- Create replica splitter block, cables to the lower calipers.
- Cable to the GL1000 master cylinder, with the mirror mount removed, or David silver can supply a very reasonably priced reproduction master cylinder which is suitable to drive twin calipers.
The 'original' bikes had a splitter attached to the horn mount, like below:
I need to look into thread types and spacing if I were to go down this route.
Another concern of mine is these original forks, obviously, my fork stanchions are only suitable for the bin, due to the corrosion at the top. These original forks are very crude and have been named 'pogo sticks' by other builders! A solution to this would be to have the lowers fitted with cartridges and then run reproduction uprated stanchions. It is of course also an option to go down the GL1000 front end, but I was not too keen on this.
Then, of course, it is building up the front wheel. I already have rims, but need to source spokes and need to skim the ribs off of the front hub to replicate the original cotton reel look that the original magnesium part had. I will have the hub vapour blasted and vibratory-polished to try and represent the original 'new cast' finish.
And of course the replica front mudguard, which is a small project in itself! I am planning on making one from an aluminum blade and fabricating the stays - a job for another time!
Extremely pleased with the seat unit, placed this onto the bike yesterday. I need to do the rear frame cutting, cross brace and hoop to accept this seat, and of course the brackets for the catch tank.
Lots to do, but glad the front end is underway!
Cheers!
CR21
captaink:
Hi, I went down the GL1000 front end, twin disks etc.
I got a billet top tree from the states and powder coated black.
I got from Silvers a GL1000 master cylinder which can branch off to a splitter or as is fitted to my other CR bike a twin banjo at the master cylinder with a brake line to each calliper.
That front mudguard will be a challenge and I've yet to consider the options.. I'll be watching what you do as your trying to be as accurate as possible.
Your looking good though
CR21:
Hi Captaink, thanks for the reply. Your build is great! Is the GL1000 front end heavy? Do you have any images of your splitter?
Yes the front mudguard is a detail that I really want to get 'right' not an easy one really though... Ideally I don't want to use fibreglass as well...
Cheers,
CR21
CR21:
Quick update:
Went to Stafford on Saturday to meet up with people and exchange parts at the show! Usually I don't go to the April show, however I knew that a CR750 guru was going to be there. A bit quiet on the jap front as expected, this was a nice machine:
Picked up a lovely CR clutch lever and cable:
And also saw some extremely rare CR parts, the original TLS rear racing hub, as well as a single leading shoe racing hub. All genuine Honda parts cast in Magnesium:
My next thoughts is how can I go about replicating this hub, and a large chunk of aluminium comes to mind...
Cheers
CR21
captaink:
Now that would be a challenge a complete hub ! ???
I haven't made a brake splitter as yet, with your machining skills though that should be an easy one for you.
Honda sounds nice, my other CR Replica sounds like that, needs to tick over at 4000 rpm though, a mate of mine says he will take it round Brands for me, but he is an ex BSB rider with no fear.
Regards Keith
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