Need dimensions '81 GS750E front disc & pads

[Rich82GS750TZ]

Bob, you're right to be jaded over photophucket. But may of us have been using free Imgur and Flickr accounts for quite a while. If you want to post more than one pic for post, hosting the images on another site, copying and pasting the BBCode here is the only way. Instructions linked in my signature if you're interested.

[Sidecar Bob]

Speaking as a mod on a couple of forums,it is much easier for people to figure out what someone posted when the pics they refer to are all present & visible. If someone hosts their own pics and their interests change they often eventually decide that they need the web space more for their new interests and the pics disappear. The same if they change web services and don't bother to move the pics (or fix the links) or if their heirs don't maintain them.

What puzzles me here is that it let me upload 5 pics in 5 posts but it wouldn't let me upload 3 pics in one post.

[Rich82GS750TZ]

Just telling you how it is. Want you to have a good experience here, and posting pics the way I've described is the best way I know. I get it, your other forum and lots of other forums allow lots of photo posting because they have lots of space. We don't. You can complain about it. It won't change anything.

You can make them look like this in the forum by copying the BBCode from its hosted location and pasting the code into the post:

[Sidecar Bob]

For the amount I'm likely to post here I'll live with a separate post for each pic

My poor man's milling machine
13 - Poor man's milling machine.jpg .

[Sidecar Bob]

Before & after milling. I removed a hair under 0.5mm per pad and there's adequate clearance for the 7mm disc now as long as I leave the pad shim out. Anyone know a reason I need it? The Honda calipers don't have anything like that.
14 - Pads before & after milling.jpg

[1978GS750E]

Speaking as a mod on a couple of forums,it is much easier for people to figure out what someone posted when the pics they refer to are all present & visible. If someone hosts their own pics and their interests change they often eventually decide that they need the web space more for their new interests and the pics disappear. The same if they change web services and don't bother to move the pics (or fix the links) or if their heirs don't maintain them.

What puzzles me here is that it let me upload 5 pics in 5 posts but it wouldn't let me upload 3 pics in one post.

OH NO!

Please tell us that you have never, ever, ever:

Worked on helicopters.......or repaired speakers......or made your own violins......or owned an electronics shop.........or own a CB400 that was hand built by Yoko Yamamoto, or somebody like that....and most importantly...........

Had a ZZR1200 with a homemade exhaust!

(Just kidding around, some on this forum will get it!)

[Sidecar Bob]

I used to design speakers in a previous life. Does that count

I also used to have a couple of Suzukis. This was my '78 GS400 when it was attached to a Jawa sidecar
GS-Jawa.jpg

[Sidecar Bob]

I drove that for a couple of winters and learned how hard winter is on motorcycles. And on drive chains. I replaced it with something with shaft drive and resto modded it
PICT0003.jpg

[Sidecar Bob]

Long story including a car turning left and writing off my winter machine and a friend giving me most of an '83 GS400 and I put this together. But the chain drive didn't hold up so I want back to shaft drive Hondas with sidecars after a couple of years
GS400 trike 1.jpg

[Sidecar Bob]

My current machines:
In the background the '83 GL1100 with modified Dnepr sidecar on that I drive in the nice half of the year and in foreground the '84 CX650E (a few parts are still original) with modified Velorex sidecar body on Ural sidecar frame that I drive in the cold & messy half of the year
2 outfits May 2022 1.jpg

[Grimly]

Before & after milling. I removed a hair under 0.5mm per pad and there's adequate clearance for the 7mm disc now as long as I leave the pad shim out. Anyone know a reason I need it? The Honda calipers don't have anything like that.
14 - Pads before & after milling.jpg

The shims in mine disappeared thirty years ago and never a problem.
They're supposed to stop rattling and squealing, and maybe they did, but it's not something that's ever occurred with mine.

[Sidecar Bob]

Thanks. I won't worry about it then.

BTW, I was thinking about the 7mm thick disc I'm using for this and IIRC it is from a GT380.

[Sidecar Bob]

I just realized that I left this thread hanging. I won't go into all of the details but I ended up turning some spacers from 3mm thick aluminum on my little lathe so that the disc would end up centred in the caliper and visiting a friend with a big lathe to decrease the O.D. of the disc a couple of mm to fit inside the caliper and increase the I.D.to fit my hub. I also gave the forks a fresh coat of paint (I've tried keeping bare aluminum in decent shape in the winter but it was a losing battle).
By mid October the new disc was bolted to the wheel, the new tire was on and I was ready to start putting it back together but when I disassembled the old brake system so that I could connect the GS caliper and the new master cylinder (the old one's bore wasn't suitable for this caliper) to my 23 year old stainless braided line I discovered that the braid had been damaged by rubbing where it was zip tied to the eye bolt on the fender (I zip tied the new line to the eye bolt loosely so hopefully between that and the new line's plastic sheath that won't happen again).
While I waited for a new line & fittings to arrive I jacked up the rear of the bike, did general maintenance there and changed that tire too.
By the end of October it was back together with all 3 wheels on the ground
27 - New line (caliper).jpg

[Sidecar Bob]

Over the next few days I test drove it a couple of times and did a few odd jobs like mounting the hand guard (absolutely necessary in winter) to the new master cylinder and generally got it ready for the season and on Nov.4th I moved the summer machine into the shed for winter storage and the CX became my daily driver. I won't really know for sure until spring but I like the new front brake so far.

Thanks again for all the help.

Here's a pic I took last week
Eccles 15 Dec 2023 right.jpg

BTW, you may have noticed the camera mount. I occasionally take videos of rides and post them on YouTube. Here's a video I took on the summer machine a few days before I put it away for the winter

[sorenlan]

I just realized that I left this thread hanging. I won't go into all of the details but I ended up turning some spacers from 3mm thick aluminum on my little lathe so that the disc would end up centred in the caliper and visiting a friend with a big lathe to decrease the O.D. of the disc a couple of mm to fit inside the caliper and increase the I.D.to fit my hub. I also gave the forks a fresh coat of paint (I've tried keeping bare aluminum in decent shape in the winter but it was a losing battle).
By mid October the new disc was bolted to the wheel, the new tire was on and I was ready to start putting it back together but when I disassembled the old brake system so that I could connect the GS caliper and the new master cylinder (the old one's bore wasn't suitable for this caliper) to my 23 year old stainless braided line I discovered that the braid had been damaged by rubbing where it was zip tied to the eye bolt on the fender (I zip tied the new line to the eye bolt loosely so hopefully between that and the new line's plastic sheath that won't happen again).
While I waited for a new line & fittings to arrive I jacked up the rear of the bike, did general maintenance there and changed that tire too.
By the end of October it was back together with all 3 wheels on the ground. here
27 - New line (caliper).jpg

I'm also impressed with your ingenuity. Turning the spacers from 3mm thick aluminum is a great solution to the centering problem. And visiting a friend with a big lathe to decrease the O.D. of the disc is a creative way to make it fit.