Topic: Machining Honda CB750 K2 Brake Disk Australia

[Rocky2010]

Anyone know of a company which will machine Honda CB750 K2 Brake Disk in Australia.
I have tried several shops around my area just south of Sydney nobody will touch bike disks, they say they are not tooled up to machine them.

[madmtnmotors]

Have you tried RPE?

http://forums.sohc4.net/index.php/topic,161064.0.html

[Elvarko]

Mate, this is a long way from you but I know the guy that owns Brakes West here in Perth. http://www.brakeswest.com.au/  May be worth a call to him. His name is Terry
Good luck

[Terry in Australia]

He's obviously a good bloke with a name like that, but for me I wouldn't piss around with machining the horrible standard discs, get one (or even better, two) of the drilled cast iron suckers from RPE. I've never tried them, but had Echo Engineering cast iron discs on a couple of my BMW's and they worked great compared to the OEM discs, which were still way better than the SOHC discs. Cheers, Terry.

[Rocky2010]

Thanks guys for the info,  RPE sounds like a great option but I was trying to keep the bike original as I can.

[slikwilli420]

Thanks guys for the info,  RPE sounds like a great option but I was trying to keep the bike original as I can.

If you machine the disk is ceases to be original so might as well upgrade.

[754]

You can machine/grind it in a way that looks totally original.
Who would want rusty discs on their stiock bike that never used them ?

Do you have acceesw to a lathe ?....block sanding the rotor, can get it looking pretty good .

[disco]

Greg Ball Motorcycle Engineering at Kirrawee. Ph 9521-8470

[Rocky2010]

Rang Greg he doesn't do disc machining anymore, thanks for the info anyway, the search goes on.

[Rocky2010]

I might be able to a guy I know to let me use one of his lathes so that could be an idea. I have a few spare disks so if I stuff it up I still have 3 more.
If it comes to the crunch I will have to spend the big bucks and get one from Yamiya in Japan they have reconditioned disks which are repainted and machine ground but like I mentioned they are expensive but I guess if you want to keep the bike fairly original it can get expensive.

Thanks for the info.

[Terry in Australia]

Have you ridden a CB750 with stock discs Rocky? They're bloody awful! The stainless steel they're made from is super hard too, that's why they're ground and not machined on a lathe, you probably won't make a mark on yours, unless you use super duper hard cutting tools. I know you can't convince someone when their mind's made up, but a cast Iron rotor and good pads should be considered a safety item, especially on a wet day when the OEM brakes don't work at all. Cheers, Terry.

[754]

The discs can be turned but its tricky. Most shops wont do it. You can see the lathe turning marks on the reduced thickness portion on the stock discs.

[Rocky2010]

Yes I have ridden CB750/4 bikes I had a couple of CB750/4 in the day, also currently have a 500/4 & 350/4 they aren't any better when it comes to brakes but I ride them for what they are and don't go crazy on them.
Want to keep the bikes standard as possible.
Also have a café CB750/4 project and that will be getting a GSX750 front end conversion.
Regular ride is a 2010 Harley Fatboy Lo which I have had since new and the brakes aren't that good on the Harley as well.
Try riding my 1942 Harley WLA and see how you go with the brakes on that old girl, the Honda brakes are much better

[Terry in Australia]

Yes I have ridden CB750/4 bikes I had a couple of CB750/4 in the day, also currently have a 500/4 & 350/4 they aren't any better when it comes to brakes but I ride them for what they are and don't go crazy on them.
Want to keep the bikes standard as possible.
Also have a café CB750/4 project and that will be getting a GSX750 front end conversion.
Regular ride is a 2010 Harley Fatboy Lo which I have had since new and the brakes aren't that good on the Harley as well.
Try riding my 1942 Harley WLA and see how you go with the brakes on that old girl, the Honda brakes are much better

Fair enough Rocky, personally I don't care what the bike is, I'll always try to improve it, but as I said before, there's no point trying to change someone's mind.

The front brake on my Sporty is a single puck caliper not unlike the one on our CB750's and it wasn't too bad before I started improving the engine's performance, and now I find it lacking, so I've bought a good used Performance Machine 4 piston caliper which should pull it up really well.

Just as well too, I've just ordered a high compression 1250 kit and a set of Andrews cams, which should make it get up and bark. Cheers, Terry.    

[Rocky2010]

My partner she has a sporty and the brakes arent too bad on the bike but its a bit lighter so they work better. I don't know why harley doesn't put twin disk brake setup on all their bikes. The tourers have great breaks running brembo calipers, vrod brakes are pretty good also.
I use to have sportbikes also a Ducati so most older bikes brakes arent the best.

[Terry in Australia]

Yeah mate, my Sporty is 22 years old (with only 7500 km on the Odo) so it's way lighter than the newer "rubber mount" Sportsters, and around 200 pounds lighter than a "big twin", so the brakes are "OK", but sh1t compared to most of my other 13 bikes. Funnily enough my old Iron Head Sportster had dual front discs in 1985, so I don't know why HD decided that just one would work on the Evo's? Anyway, that beautiful PM 4 piston caliper will sort it out. Cheers, Terry.

[CB750project]

Have you tried Max Camm @ Planet Discs?

PM me if you need his mobile.

He did as great job of my K3 disc...

Dropped it off, went for a drive for san hour and came back and picked it up.

Cheers

Muzza

[PeWe]

David Silver sell new aftermarket disc, claimed to be better than OEM
https://www.davidsilverspares.co.uk/CB750K2-FOUR-1972/part_273689/

[Henning]

David Silver sell new aftermarket disc, claimed to be better than OEM
https://www.davidsilverspares.co.uk/CB750K2-FOUR-1972/part_273689/

Anybody have any experience with the David Silver disc? The disc on mine is warped and drives me nuts as it wacks the caliper from side to side. A bit more stopping power would be welcome too.

[Rocky2010]

After sometime with a sanding block and wet & dry sandpaper on the disk surface I have now removed the rust
on the disk.
The centre alloy disk carrier I have put it in my blasting cabinet to remove the black paint after I spent sometime masking the disk surface so I didn't damage it.
Disk has now been refurbished and it is now ready to install on the bike 

[Terry in Australia]

Looks good mate, although blasting the rust off the rotor probably would have been much easier, and the slightly roughened surface would have improved the braking. Cheers, Terry.

[Rocky2010]

Thanks for you compliment Terry

Here it the disk is on the CB750 I am restoring at the moment

[Terry in Australia]

Nice! And a nice looking shed too, I'm guessing!

[Rocky2010]

thanks Terry
Yes its a nice big shed 

[Rocky2010]

Finally rebuilt the Front Brake Caliper, its repainted with new piston & rubber seal.
Had great time trying to get out the piston which was nicely stuck in the caliper like most of the old Hondas end up. Made a tool out of an old Banjo bolt with a grease  nipple that trick always works compressed air wouldn't move it.