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CR750 replica build

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philward:
Twin discs done! Nothing like the previously posted guide's (worryingly!) - done away with speedo gear and made a spacer to locate replace speedo bits. Main issues that have been previously seen as an issue, lining brake arm parallel to disc which normally requires filing of bottom pivot arm - I had to shim it to get arm parallel! (And shim upper m6 mount's about 5 mm). Both discs are parallel to discs but won't know if all works properly until all hydraulics connected (no where near that point). I'll now have some proper spacers made up from stainless

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MarkCR750:
Well if the arms are parallel to the discs and the callipers with pads fitted fit and the wheel rotates it should be fine, before I fitted the callipers I put a 12" steel rule edge on across the calliper mounting face on the arms and down across the discs, then measured the gap between the edge of the rule to the disc altering the shims until the gap was parallel across the disc, I had to file the bottom bolt mounting lug on mine, anyway there are bound to be differences between bikes so if it's all parallel sounds like the jobs a good un!.

philward:
Only minor issue I have is the new pad that goes on the arm side is a lot thicker and pushes the arm out of parallel so I swapped it to the other side and the new pad from the other side is a few mm thinner fitted in the RH side fine and allowed parallel. The LH now binds slightly (pushing arm slightly out of parallel) and so a mate is going to mill the thicker pad down to the same size as the thinner one. The pads are different makes so don't know why they are different thickness'. The pads surface to the red max wear line is smaller on one set.
I'm glad it's not a use everyday bike as its going to be a pain to take the wheel off!

MarkCR750:
Yes it's annoying having to take the 2 calliper bolts out to remove the calliper every time you need to remove the front wheel, only a problem during build though, I don't think my front wheels been out again for at least 18 months, so barring a puncture it's a small price to pay for brakes that actually work! 😄

CR21:
Just a quick update:

This will allow me to fit disks to both sides of the hub whilst retaining the speedo drive unit without the need to modify any other parts. The machined part will replace the original two part pressing which can't be used as it locates in an area that the disk.

Designed up in CAD, now to draw and then machine:






Some progress on the replica hinged clip-on parts:





More to come (hopefully) soon!

Cheers
CR21

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