SOHC.co.uk Forums > CB750
CR750 Replicas
Voxonda:
--- Quote from: Phil on March 08, 2008, 09:08:10 AM ---...................... The s/s discs weigh a ton and say on them that the minimum thickness is a wopping 6mm! My s/s NSR discs say maximum thickness is 3.5mm. Does anyone have experience of machining discs? Does anyone know where I can get the discs drilled? Thanks!
Phil
--- End quote ---
Hey Phil, I have machined down a few disks, as long as they are not drilled it's ok. If they're drilled you tend to get a vibration in the disk because of the holes and then the surface isn't smooth. Drilling isn't that hard to do, as long as you use sharp drills. Must have a template somewhere in my archive, if you want I will look for it.
Cheers,Rob
Voxonda:
Forgot the picture:
Cheers
Andymuck125:
I have done a few disc aswell. i skimmed the rear disc on my F1, i think it is 4.5mm now, and most of my mates cars have had a skim at some stage or other 8)
Phil:
I want to reduce the (huge!) weight of these discs. Given your helpful advice, should I (a) skim them to 4.5mm or b) drill them? Thanks to all. Phil
lordmoonpie:
Hi Phil - if you want to change discs, talk to Len at CAT Engineering, Crwothorne, Berkshire. He can take your stock discs (by post), take them apart, refurbish the centres and rivet on a nice new cast iron rotor, drilled as well which will put you over the bars compared to the standard steel discs. OK cast iron does rust up after getting wet but as long as you scotchbrite the discs when dry they'll last just fine. I had both of mine done by Len on the 750 and also the disc on the 450 racer. I can stop the 450 on a sixpence! They're 290mm diameter but 4mm thick and the stopping power is awesome.
For your rim sizes for the CRMC, suggest you contact their Honda expert, John Davidson and he will be able to help or Gordon Russell the eligibility officer via crmcelig@aol.com. I'm running a WM3 front, WM5 rear btw!
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