Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
Now I did my first twin disc using two 500 sliders which put one caliper in front and one behind and altered the muguard mount by carfully cutting off the psrt with the bolt holes , turning it round and welding it back on. Don't ever remember shimmng anything and everyhing worked ok.Later rebuit it with a 550 sider when they came avaiabe used but still dont remember any shimming.I bought a genuine part speedo drive as it is the very eary 750 one that is needed and have still got one NOS for one of my projects which i wi happily take pictures of and measure but not sell I also used a girling master for an eary GL1000 which was identical to the Honda part as this meant the lever did not travel so far back before the brakes worked.All this was back in the 76/77/78 era so don't ask for any better descriptions, the only other thing i remember is finding out the steering stem was bent where it went into the lower yoke as when I used the brake hard the mudguard came up between the two centre pipes of the (Very Loud) Marvin exhaust system so no matter what you wanted to do you went straight on, as the IOM plod found out just before he dived over the wall at Glen Helen---I let the brake off and just got round, always hated my mates GS750 after that as there was no front brake operated brake light!!!
Yes Ewan, had noticed it on your post. Was trying to work out if this bloke from Salocal put the drive plate in and then just crushed it by pulling it in by tightening up the disc bolts
Ewan, I have the same hub as showing in your post.
Seems straight forward Ewan. Have loads of bolts in stock, was going to use some 110mm 8.8.
Sorry Graham but your wrong here. If the parts were identical then it would have the same part number, there are NUMEROUS examples of Honda using the exact same part on lots of different models but they still kept the original part number. There are websites dedicated to cross referencing part numbers, showing all the models that part number was used on. The 250N master cylinder was a single disc MC not a double disc, if you look at the 400N (45500-443-614) which did have a twin disc setup it didn't use the same part number as the 250N (45500-442-612) yet they would have looked identical, yet they were designed to do a different job. So it looks like you put an MC onto some CX500 which if they'd had been in an accident, and it was blamed on the wrong one being fitted, you'd have been liable I'm not saying that sourcing where the parts were manufactured originally means your wrong to fit them as they don't have the Honda part number on the bag, clearly they are the same part, as such they are fine to fit. However it's wrong to assume that just because a part looks the same as another it's the same part with another part number, Honda just didn't do that, especially in the 70s.