Converting a 600 to twin Disc

[popelli]

Apart from the extra caliper and disc rotor and a wheel drilled for two discs is anything else required to convert the bike to twin disc

Also the caliper I am looking for is there a brembo part number or something I can use to find one on flea bay

[slob]

A fork leg with caliper lugs and a master cylinder that pumps sufficient fluid to use two calipers effectively.

[Darren69]

You'll need a fork leg with the caliper mountings if you don't have one already, 2 or 3 brake lines depending on how you want them set up, 2 full lines or 3 lines with a splitter. You may need a bigger master cylinder as sometimes they are sized for either 1 or 2 disks. Maybe the one you have will be good enough to run 2 disks, I don't know but I'm sure someone on here will have done the mod.

There used to be a DP kit to do this on the 600/750SS as I recall the wheels were already drilled for a second disk as were the forks.

[Darren69]

Slob - snap! :)

[Mr Gazza]

I converted my very early dry clutch 750SS to twin discs.
I imagine it was a fairly similar animal to your 600.
Wheel and fork was ready to receive, so just a matter of getting a matching disc and calliper from a breaker or private ad. Best to get the disc bolts and calliper bolts new.

I seem to recall a story at the time, of a type of brake line to avoid, which tee's close to the mudguard and had been know to cause accidents by getting fouled on the tyre?
I think the lines I got had the tee near the bottom yoke?
Or you can use two separate lines with a longer banjo bolt in the master. .. and there again I seem to recall an issue some folk had with incorrectly drilled banjo bolts not being able to supply two banjos.

I used the standard coffin type master cylinder and reservoir that came with the single disc. The lever travel did increase, as it was moving twice as much fluid. But the braking power increased pro-rata. So I had a very powerful brake with a terrific amount of feel and feedback.

It's a very worthwhile mod... Don't forget to fit 4 new pads. (preferably organic type.)

[Luddite]

According to the Monster Bible, the 600 uses a Brembo P4 30/34 caliper. Harris still sell these:

http://www.harris-performance.com/acatalog/Goldline_Range.html

I think you'd need the 40mm one (measure the distance between the mounting bolts on your caliper to check).

The twin disc bikes use a 16mm master cylinder while yours is 13mm. But, as Mr Gazza says, you might get away with your original. Maybe try it first and see how it feels before shelling out for a replacement.

As far as brake hoses are concerned, Venhill do a three hose replacement for the M750, which should be the right length with the right banjos for your purposes.

http://www.venhill.co.uk/Hoses_&_Cables_-_Motorcycle/DUCATI/750/MONSTER/M750_MONSTER_'94-98/DUC-7004FS_DUCATI_FRONT_BRAKE_3_HOSE_KIT_STAINLESS.htm l

[Luddite]

This new caliper on ebay seems a good price, even after postage and, probably, another £30ish VAT & duty (if you don't mind buying from Japan).

http://www.ebay.co.uk/itm/brembo-Brake-Caliper-P4-30-34-40mm-Europe-Regular-Imported-Product-for-Right-/262928393601?hash=item3d37c0e581:g:6IcAAOSw6DtYWe-8

Or this one from Carpimoto in Italy looks a better bet at around £125 including tax and postage. (The Brembo part no. is 20516568.)

http://www.carpimoto.com/EN/Brand_Brembo/4292_20516568-Brembo-P4-30.htm

PS it looks like the Harris price is for a pair of calipers...

[Blah blah]

Why do you feel, the need to change from a single disk?

My old 750 had a single disk, braided hose and decent pads and it was enough to make the front tyre squeal. Another disk and all the bits that go with it equals additional unsprung weight which is never a good thing...

[Darren69]

Maybe just upgrade to a much better master cylinder (Radial RCS type) would be a better option?

[Darkness]

Maybe just upgrade to a much better master cylinder (Radial RCS type) would be a better option?

Or put the money towards a pair of lightweight wheels for looks and improved handling?

[popelli]

Why do you feel, the need to change from a single disk?




Car slammed brakes on suddenly in front of me and I realised it was too close for comfort and brakes are not up to what is required in todays conditions

Have the same problem with one of my cars 916 alfa V6 spider, brakes are 20 year old design and traffic conditions have changed in last 20 years always drive with huge 4 second gap in front of me

[Mr Gazza]

I know where you're coming from.
The extra disc was a massive improvement on my 750SS, and of course you will benefit from fresh fluid and pads at the same time.
I really liked the extra lever travel that came with the standard master and extra slave. It gave so much control over all that braking power.
The later set up with 16mm master and remote reservoir can be a bit sharp, it needs a sensitive touch... It took me a while to get used to that.

When I did the 750 I fitted EBC "Greenstuff" pads. They were fantastic, but sadly don't appear to be available for motorcycles any more. I still use EBC organic pads though.

Yeah, I'm an Alfa owner too. Saucy lady that she is, I let her get away with a lot of short comings! Try a set of Greenstuff pads and a fluid change. New discs are not outrageously priced either.

[Yorkie]

Apart from the extra caliper and disc rotor and a wheel drilled for two discs is anything else required to convert the bike to twin disc

Also the caliper I am looking for is there a brembo part number or something I can use to find one on flea bay

I did a twin disc set up on my M600. I was lucky enough to have the calliper mount on both fork legs.

I opted for a second hand set of 916 brake discs (cast iron fully floating), calipers and master cylinder to suit. I then changed the clutch master cylinder so it matched.

It was transformed from okay stopping to groin crushing (found that out when I tested them).

That was over 15 years ago and they are still going strong, I have changed the pads but that is it.

As for the wheel if you take the plastic blanking plate off you should find all the holes necessary for mounting another disc with out sourcing another wheel.

Yorkie

[Dukedesmo]

Other than cost, I never understood why a 600 got a single disc yet a 900 got twin discs?

OK the 900 is faster but likely to be ridden at the same speeds on the road and stopping from 60mph is the same on both - how much heavier is a 900 than a 600? (not much I'd guess).

I'd definitely add a disc if it were possible and AFAIK the forks and wheel should have the mounting points so you only need a disc, caliper, new lines and a bigger master cylinder.

Given that most Ducatis of the same vintage used the same, or compatible parts they should be readily available at a reasonable price.

Plus it looks better, more balanced IMO.

[Dirty]

- how much heavier is a 900 than a 600? (not much I'd guess).


10kgs according to internet. 2 to 3 of them would be the extra disc and associated bits of course.

I've got twins on mine. Looks much better and stops on command.

[Nasher]

Lots of bikes from different manufacturers, particularly Suzuki, used the same Brembo calipers as Ducati.

For example, the RGV250 used a single front disc and caliper, but it was on the right hand side, so you can look for an RGV front caliper and it will match the one currently on the Left of your 600 mechanically but will be silver not Gold.

They tend to be a little cheaper than the Ducati Right Hand caliper on ebay etc as everyone wants them to upgrade their 600 and 750 Monsters and SS's to twins.
If you can use a can of brake cleaner and an can of spray paint it can save a few pounds.

Nasher

[Darren69]

Its mostly Italian bikes like Aprillia, Cagiva, Guzzi etc and they do tend to be a bit cheaper. You just need to check whether they are early 40mm or later 65mm bolt spacing type. It might be easier to source a pair and keep the other as a spare or flog it.

BTW if yours are 65mm I have a pair for sale but I'm not splitting them. :)

[popelli]

Forks I have are 40mm spacings

Have a pair of calipers with 100mm spacing of a long abandoned project, shame they aren't 40 mm

No idea what they fit

[Dukedesmo]

Any good? http://www.ebay.co.uk/itm/Ducati-ST2-944-Front-Right-R-H-Brake-Caliper-61040122B-FREE-UK-SHIPPING/281968632520?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D2%2 6asc%3D40656%26meid%3Df5084a7849074a4cafa433150d50 e97b%26pid%3D100005%26rk%3D4%26rkt%3D6%26sd%3D1823 89928272

[Luddite]

Any good? http://www.ebay.co.uk/itm/Ducati-ST2-944-Front-Right-R-H-Brake-Caliper-61040122B-FREE-UK-SHIPPING/281968632520?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D2%2 6asc%3D40656%26meid%3Df5084a7849074a4cafa433150d50 e97b%26pid%3D100005%26rk%3D4%26rkt%3D6%26sd%3D1823 89928272

Unfortunately, that's got a 65mm spacing between the mounting holes while the 600 is 40mm. There's bound to be one out there though...

[Dukedesmo]

OK, wasn't sure if ST2 got the 40mm or 65mm being a '97 as they were still using 40mm in '98 on 916 models.

[Nasher]

I'm probably going to have a pair of 40mm calipers available in about a month or 6 weeks time.

Sorry, couldn't let them go until I've confirmed the other option I'm working on all goes to plan.

They will need painting Gold though.

Nasher.

[Nasher]

This should be right.

http://www.ebay.co.uk/itm/122449946285?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

Nasher

[popelli]

This should be right.

http://www.ebay.co.uk/itm/122449946285?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

Nasher

Its correct but I'd rather wait for a nice one or a pair to come along

Its for the wifes bike and I have enough projects on the go without repainting a caliper

[Darren69]

Yea, it may have been gold once too by the looks of it. before the Demon Tweekers got a hold of it! Pairs do pop up from time to time for sensible money, but the problem with the 40mm type is they are sought after by the 916/M900/900SS resto crowds which pushes the price up.

I saw a decent set the other day but they're gone now I think, couldn't find them anyway.

[Dirty]

I have one somewhere but I believe it is the original as the previous owner did as has been suggested here already and bought a pair to fit.