5/8th master cylinder

robh1f · Post by **robh1f** » Mon Mar 29, 2010 10:12 pm

What is general opinion re new 5/8th master with a single disc setup?? Will it be better than the original?? or do I shell out for new pipes and hoses and put the 2nd disc on??

scouse · Post by **scouse** » Mon Mar 29, 2010 11:13 pm

a twin disc is very heavy front end but it will stop better.

Gary T

Post by **Wolfie** » Mon Mar 29, 2010 11:14 pm

yep, shell out.. much better with two.

husson73 · Post by **husson73** » Tue Mar 30, 2010 8:26 am

Wolfie wrote:yep, shell out.. much better with two.

+1

the180kid · Post by **the180kid** » Tue Mar 30, 2010 9:30 am

my twin disc works very well and its a standard brake res,..

Post by **Wolfie** » Tue Mar 30, 2010 5:24 pm

It's odd that some seem to work OK with two discs. mine wouldn't, I became a sheller outer.

kas750 · Post by **kas750** » Tue Mar 30, 2010 5:49 pm

scouse wrote:a twin disc is very heavy front end but it will stop better.

Gary T

I would definitely agree,you can really feel the difference they feel so heavy and ponderous.My h2 seems to stop ok with a single disc..........................Mind you when you see some of the braking systems on my other vehicles i AM easily pleased

the180kid · Post by **the180kid** » Tue Mar 30, 2010 8:02 pm

Theres definately a happy medium with braking, if your used to modern bikes you will over shoot at rounderbouts,..

with single disc, twins stop it on the button, that was the deciding factor that i defo needed the double,..

robh1f · Post by **robh1f** » Tue Mar 30, 2010 8:30 pm

Thanks for the feedback guys. I have already got the 5/8th master cylinder but the guy I'm building the bike for feels that it won't be as effective as a standard master with a single disc????? I think the twin discs will make the front end ponderous so would like to stick with the single disc setup....with a 5/8th master....is it gonna work???

Rubbadub · Post by **Rubbadub** » Tue Mar 30, 2010 8:31 pm

okay I am convinced, where can i get these bits, i have a double connector in the middle, have a lh bracket and caliper spare and a 3/8 master cylinder, do I really have to go to repro graphics for the master, and does anyone know a good machine shop thatll convert LH caliper and brckt to RH?

Conversely are there modern calipers tha will bolt on to a 72 H2?

the180kid · Post by **the180kid** » Tue Mar 30, 2010 8:46 pm

robh1f wrote:Thanks for the feedback guys. I have already got the 5/8th master cylinder but the guy I'm building the bike for feels that it won't be as effective as a standard master with a single disc????? I think the twin discs will make the front end ponderous so would like to stick with the single disc setup....with a 5/8th master....is it gonna work???

too many ? marks,
hows that going to work then it wont make a hoot of difference if got a 5/8th or not, its just speculation and not trial,..not like what we know,.its not ponderous to me with 2 discs, but i know one disc is rubbish, they do pull together, the bikes are heavy as is to define a ponderous front end is just speculation unless you actually know, or have even tried it,..2p. there is no difference except better braking,.

Post by **Wolfie** » Tue Mar 30, 2010 8:54 pm

Front end didn't feel any different to ride, it just stopped.....

kas750 · Post by **kas750** » Tue Mar 30, 2010 9:11 pm

I rode simons twin disc h2 and the front end felt heavier and the steering seemed vague and the actual power was not the mammoth improvement i was expecting......Thats MY 2p

the180kid · Post by **the180kid** » Tue Mar 30, 2010 9:54 pm

4lb on the front and you noticed all that, its an old bike with crap handling and crap brakes and the list goes on,..believe me there is a big improvement with 2 brakes, thats why kawa brought out the 5/8th system thingy so would be worth a fortune in yrs to come,...so the crap goes on,..ride mine you see stops on a dime heard it was on par with a 600 fazer one time...

robh1f · Post by **robh1f** » Wed Mar 31, 2010 5:53 pm

Rubbadub you have a PM re master cylinder. Thanks again for input guys the guy I'm doing the bike for(nick joy) is used to GSXR 1000s etc and I guess braking is preeety good on them!!! So after Brians comment about stopping on a dime I guess after he sees this post TWIN discs it shall be. Cheers Rob.

Rubbadub · Post by **Rubbadub** » Wed Mar 31, 2010 8:52 pm

ta rob, ill have a look!

/ John

robh1f · Post by **robh1f** » Wed Mar 31, 2010 9:08 pm

No problemo John.

scouse · Post by **scouse** » Thu Apr 01, 2010 4:36 am

Rubbadub wrote:okay I am convinced, where can i get these bits, i have a double connector in the middle, have a lh bracket and caliper spare and a 3/8 master cylinder, do I really have to go to repro graphics for the master, and does anyone know a good machine shop thatll convert LH caliper and brckt to RH?

Conversely are there modern calipers tha will bolt on to a 72 H2?

not bolt on without making brakets

contact Leon from the Netherlands about a calliper bracket (he is on rb's board)

Gary T

Mr Boring · Post by **Mr Boring** » Fri Apr 09, 2010 2:56 pm

Conversely are there modern calipers tha will bolt on to a 72 H2?

I have a pair of brackets to adapt Brembo opposed 4 piston calipers to stock H2 forks-if you're interested.

I made them about 10 years ago when I temporarily uprated my H2a brakes whilst I was building my H2E special 'thing'.

The Brembo's come off a Duc Monster M900/750/600, just one of these calipers easily exceeds the braking power of the twin disc kawasaki conversion-more so if you use the 5/8ths inch master cylinder for more fluid transfer (which I had fitted at the time).

They also provide a very progressive feel and possibly more importantly this is retained in wet conditions with the stainless steel H2 discs.

It all depends whether you are one for complete originality or are prepared to experiment with better parts if you do a lot of riding, a good compromise to retain 'period' looks would probably be 2 x Z900 calipers or S/KH series as these are one piece I believe-H2 calipers are a bit of a joke with the split down the centre not doing anything for solidity in my opinion.

If you seriously uprate your brakes on your stock H2 you'll need to check your handlebar clamps are properly tight-believe me hi-rise bars (even splined ones) will try and rotate forwards the first time you grab a big handful of front brake!

I can post some pics of the brackets/forks if you're interested although it might be a couple of days before they get posted-I've just had a knee operation so doubt I'll be able to get in the loft to find 'em just yet!

Now.........where's those bleedin' crutches

Rubbadub · Post by **Rubbadub** » Fri Apr 09, 2010 3:17 pm

yes pls... I am interested

Mr Boring · Post by **Mr Boring** » Sat Apr 10, 2010 3:33 pm

Here are the adaptors mounted on H2 forks:

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And these are the calipers you would need to source-with the H2 fork arrangement shown alongside. These are the early Duc 4 pot calipers with 40mm screw hole centres-ran for about 10 years from the early nineties-later ones may differ.

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This arrangement will work with the relatively thick H2 discs-you'll need to push the pistons as far back as possible in the Brembo's to fit them. To fit the adaptors to the forks use M10 high tensile screws and nyloc nuts with flat washers, these replace what used to be the H2 caliper bracket 'behind' the forks if you see what I mean.

If you think they are suitable please PM me.