Twinpot Brake upgrade on 78 Skunk

[salty_monk]

I have provisionally looked at those calipers & I don't think you'll be able to get them in the right spot using the top fork leg mount like that. The pad is not sitting right on the rotor (which is dangerous as it will where a ridge that can then brake & jam the wheel) and if it were then you wouldn't have enough space to fit in the extra bolt you'd need.
You'll need a multi level 4 bolt plate I believe. It should be possible to make it work but I think you'll still need a bigger rotor or to space the caliper away from the fork leg in a clockwise direction top provide bolt clearance (so you may need custom length brake lines).
Check the clearance between the back of the caliper & the wheel spoke carefully.

So i have been reading this thread for the last two days reading everything I can, and I have a couple of questions. my buddy had a 90s kawa these came off of, i do have access to machine tools and can make a bracket as need be. also as you can see that is the stock disc from my 850. is there any issue in what im doing? I planned to use the slotteds off my other 850 instead but they are the same dimensions. as long as the clearance is ok as stated before i should be fine?

[mmattockx]

does anyone know if GSXF600 / 750 88-97 Suzuki

disks would fit a gs850 1979 instead of cbr disks(really hard to find ,and if to expensive)
thanks

Nope.

89-97 GSX750F rotor dimensions: http://www.metalgear.com.au/mgear-br...e-p-11690.html
CBR600F3 rotor dimensions: http://www.metalgear.com.au/mgear-br...e-p-11663.html
1979 GS850 rotor dimensions: http://www.metalgear.com.au/mgear-br...t-p-11585.html

The Katana rotor has a 5 bolt pattern and 19.5mm offset while the F3 rotor has a 6 bolt pattern and 17.0mm offset. The 6 bolt pattern is key, as the GS hub uses a 6 bolt pattern and you need the same number of holes to allow you to drill the GS bolt pattern into the F3 rotor carrier.

FWIW, that Metal Gear site also lets you search by rotor dimensions to see what can cross reference with what: http://www.metalgear.com.au/search_b...asurements.php


Mark

does anyone know if GSXF600 / 750 88-97 Suzuki

disks would fit a gs850 1979 instead of cbr disks(really hard to find ,and if to expensive)
thanks

[bobtail84]

The steel lines are a nice touch in completing the good looks of the new setup.
Are you using the stock master cylinder?

Yep still using the stock M/C.

I think he was referring to your 220v (240v?) electrical wall receptacles above your workbench in the top left

Yes...yes he was.
...and I don't think we should be comparing nipples - this is a family site.{lol}

Beautiful, my Wezmoto s/s brake line kit came in today...1 day to get to Chicago from the UK....8 added days to get from Chicago to me {Chicago is a 60min drive from me}...nice to see the USPS is improving.

[steve murdoch]

The steel lines are a nice touch in completing the good looks of the new setup.
Are you using the stock master cylinder?

[bobtail84]

The brake upgrade is done.

The improvement is huge and it's a very easy conversion.





All I have to do now is sort out the sponginess in the lever and jobs a good un.

[bobtail84]

Outlets = plug socket - two people separated by a common language

looking good! Are those stainless Pistons? There's a good place for those in the UK, can't get stainless here in the US

They are stainless pistons from these lovely chaps below. They are very helpful bunch and if I recall the pistons were £ 15 ish each.

Powerhouse Automotive (UK) Ltd Unit 7, Carr Wood Industrial Estate (Phase 1) Carrwood Road, Sheepbridge Chesterfield S41 9QB UK
+44(0)1246 260665

https://www.powerhouse.uk

They do have an ebay shop and they sell full repair kits or single items.

[salty_monk]

Outlets = plug socket - two people separated by a common language

looking good! Are those stainless Pistons? There's a good place for those in the UK, can't get stainless here in the US

[bobtail84]

I think he was referring to your 220v (240v?) electrical wall receptacles above your workbench in the top left

Ah with you it's true we do have a few strange ways on this side of the pond but that's what happens when you live on a small island, some say it makes us special....

Anyway the rotors are drilled ready and I've dry assembled the calipers on to the bike just to see if there are any issues and I'm pleased to report that they were just fine. I have ordered 2 stainless steel bolts with nuts and washers to locate the bottom part of the bracket to the forks and I'm ready to go.

[Chuck78]

I think he was referring to your 220v (240v?) electrical wall receptacles above your workbench in the top left

[bobtail84]

Look'in good...cept for those funny looking outlets, but maybe it's just my perspective from this side of the pond{lol}.

Hey Bob, what do mean outlets? The bleed nipples are a standard item over hear are yours different so to speak.

Look'in good...cept for those funny looking outlets, but maybe it's just my perspective from this side of the pond{lol}.

[bobtail84]

I have cleaned the buttons and de glazed 1 rotor so far and the results are quite impressive.



I have also built up the calipers







I'm going to de glaze and clean the buttons on the 2nd rotor and use my salty_monk spacer/template to drill the holes. Wife and family permitting I'm gonna try and get it all fitted up this week end.