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Twinpot Brake upgrade on 78 Skunk

Henway said:
I tried to fix my wooden feeling braking with a GSXR 750 master cylinder. Now it's a powerful, wooden feeling.

What is the actual CAUSE for the poor braking performance? Is it the rotors, the calipers, or the master cylinder?

I have an '83 ESD and I've put a blocking plate over the anti-dive and have custom Goodridge kevlar lines (and the GSXR master cylinder).

If the culprit is the calipers (I've rebuilt them to no effect), is there another caliper that will go on without modifying the rotors? Or is it BOTH the calipers + the rotors that is the problem....(with this thread populated by F3/CBR900 conversions)
Click to expand...

The biggest problem is the brake caliper/brake pad which yields swept area. More swept area = more braking power

Just check the size of the pads on the GS vs the Ninja calipers

I'm using the stock brake rotors, stock master cylinder, the Ninja calipers with whatever old brake pads came in them (soon to be upgraded). and the rubber hoses that came with the calipers.

My braking power has at least doubled.

I went for years with the single front caliper with steel lines.

I'll never go back
 
As well as the swept area more pistons to push it also helps - That helps hugely with feel too.

There are no straight bolt on calipers that work with the stock rotor that I know of... Some period racing ones around from back in the day but big money for them.

Their is nothing wrong with the rotor. The floating Honda rotors offer less fade, better performance in the wet & save some weight, that's it.

:)

Dan :)
 
Yes, the upgrade is like night and day. Just wish the rotors that I got from the slimebag (who sometimes posts her in the for sale section (posseaux, I think is his name) werent warped.
 
So I need the following brakes:
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=370244471887&viewitem=&sspagename=STRK%3AMEWAX%3AIT

http://cgi.ebay.com/ebaymotors/ws/e...0245834667&viewitem=&sspagename=STRK:MEWAX:IT

http://cgi.ebay.com/ebaymotors/ws/e...0234206907&viewitem=&sspagename=STRK:MEWAX:IT

But THESE will NOT work?
http://cgi.ebay.com/ebaymotors/ws/e...0437136951&viewitem=&sspagename=STRK:MEWAX:IT

Shoot, what DISQUALIFIES calipers if I'm making a mounting plate anyway? Obviously no radial calipers.

Then, I will need:
http://cgi.ebay.com/ebaymotors/ws/e...0445974689&viewitem=&sspagename=STRK:MEWAX:IT

or

http://cgi.ebay.com/ebaymotors/ws/e...0355846355&viewitem=&sspagename=STRK:MEWAX:IT

My spare pair of 1995+ RS125 floating rotors has the same large hole and 6 holes, but the centers don't line up exactly. It wouldn't be too difficult to have a machinist properly enlarge, or even make completely new holes, but without using a drill press it definitely won't work to just enlarge the holes. The offset from the wheel is far smaller than with the GS1100 rotor.

Does the rotor need to be spaced out from the wheel? Also, is there a specific thickness for the aluminum (I could also do Ti) for the caliper mounts? Are there any other requirements? I have an extra front tire/wheel I can experiment on.
 
Last edited:
For this setup, those calipers arent the right ones, the rotors look right tho. If the calipers say "tokico" on the top, they are the wrong kind.
 
Those are the wrong calipers to work with this setup. You need the pre 1990 ones.

Yes you have to space those rotors out from the wheel to work with this setup. You need the offset. You re-drill the holes in the honda spider to fit the GS in between the original holes. The size of 295mm dia is important.

Dan :)
 
Thank you very much for the responses.

Could you please tell me the reason newer designs are disqualified?

Or, what is the most important reason you recommended the circa '90 parts?

Is it offset? Is it thickness toward the axle? Towards the outside?

If I'm OK with making a bracket for the caliper anyway, is there a reason to disqualify newer calipers?

I'm just trying to figure it out! I don't want to reinvent the wheel, but I know I will at the minimum be making a single-plane caliper adapter. At the max I can envision making a 2 plane (offset outwards/inwards to the wheel) adaptor.
 
You should be able to space the rotor far enough away from the wheel & make a stepped bracket if you have full facilities.

The method here is just the most economical way of doing it. Originally it was designed to work with STOCK GS550 rotors so their size & offset limits options. I put Honda CBR on later.

Dan :)
 
2 of these left now..... I found another powdercoated one. Come get them, I doubt I'll be getting any more unless 20 or so people get together for a bulk buy.

Dan :)
 
steve murdoch said:
Another member of the Salty_Monk twinpot conversion team. I borrowed the stainless lines that were on it for another project but you get the drift.
I have not had the bike out so i cannot comment on the braking improvement, YET.

000_1444.jpg
Click to expand...

Nice Ride; that baby's CHERRY!
 
I have had a clear up in my garage & found 2 more sets. No bolts left though. I do have hub spacers.

Dan :)
 
Depends on the bike.... Your 83 probably has a wider triple than the 1000.

2 sets left now.

Dan :)
 
Anyone know the part number on these EBC rotors?

attachment.php


Is it MD1003 or MD 1014??
 
salty_monk said:
Anyone know the part number on these EBC rotors?

attachment.php


Is it MD1003 or MD 1014??
Click to expand...

MD1003 296mm 58mm center 17.2mm offset 74mm PCD
95-98 CBR600RR F3
94-97 VFR-750
94-97 CBR900RR Fireblade
98-05 VTR 1000



MD1014 296mm 62.2 center 17.2 offset 78mm PCD
99-00 CBR600RR F4
98-05 VFR-800
93-94 CBR900RR
97-03 GL1500
01-08 GL1800



Just to throw it out there

MD1012 310mm 58mm center 21.1 offset 74mm PCD
94-95 RVF 750 (RC45)

MD1010 310mm 58mm center 17.8 offset 74mm PCD
90 750R (RC30)






EBC Catalog
http://www.who-sells-it.com/images/catalogs/856/pdf_883.pdf
 
Last edited:
Aha thanks. Catalogue I have doesn't give all those details just dia, bikes & part no. Interesting.. the latest catalogue give 1014 as a 296mm disk & I don't believe those are 1003's as he hasn't re-drilled the holes just enlarged them.

Cheers,

Dan :)
 
Last edited:
I think you are right on the 296mm.. The brembo charts i dug up match on all aspects but the diameter..
 
Perhaps it's a typo in the chart... even has 296mm standard in the title when they list that part for the F4 :)
 
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