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SOHC.co.uk Forums => CB750 => Topic started by: sprinta on February 10, 2020, 05:19:58 PM

Title: Twin disc caliper modification?
Post by: sprinta on February 10, 2020, 05:19:58 PM
I am considering doing a twin disc conversion on my 73 CB750 K2 and currently looking at all the parts I would require to do the modification.

On looking at the caliper whilst it it is straightforward to fit to the RH side they are handed in the sense that the nipple will now be closer to the fork tube and the hydraulic pipe now furthest away as the seats for the nipple and hydraulic pipe are different with the nipple using an inverse cone shape and the pipe a raised cone seat.

On looking at the relevant parts book page, see attached, there is an unnumbered part that looks to be some sort of olive insert above the pipe connection position.

Can anybody advise if this a push in seat that can be removed or if there is a relatively simple process so the nipple and hydraulic can be fitted as a mirror image of the LH side with the hydraulic pipe close to the fork leg?
Title: Re: Twin disc caliper modification?
Post by: Trigger on February 10, 2020, 07:28:35 PM
Yes, it is a press fit. You will destroy the old one getting it out. I think Yamiya do the caliper and spacers for the 750 conversion  ;)
Title: Re: Twin disc caliper modification?
Post by: sprinta on February 10, 2020, 11:57:26 PM
Yes, it is a press fit. You will destroy the old one getting it out. I think Yamiya do the caliper and spacers for the 750 conversion  ;)

Thanks for the reply.

Title: Re: Twin disc caliper modification?
Post by: Trigger on February 11, 2020, 12:23:56 PM
Caliper and the arm for the right side >>> https://www.yamiya750.com/index.php?main_page=product_info&cPath=246_251_184_86&products_id=2468
Title: Re: Twin disc caliper modification?
Post by: 71 V12 on February 11, 2020, 03:05:17 PM
Hi Sprinta,

I am in the process of gathering the parts to add a right disc to my 750 K4. A second hand Caliper and arm cost me £50 and a disc £20. The Yamiya Caliper and arm is £350 ish plus shipping and duties and looks like K0/1 type to me.

There is a olive of some type in the Caliper in the pipe location. I have removed it by threading it and pulling it out with a screw. I am planning to make brake pipe with a bubble flare and a long M10 tube nut. Hopefully this will seal.

The other issue I can see is securing the steel brake pipe to flexible to the mudguard. The left side has a correctly bent wire welded to the mudguard. Not sure yet what to do for the right side. Maybe a K0/1 type bracket can be adapted.

The conversion is far from straight forward. Where are you at with the job?

Cheers,

Kevin



Title: Re: Twin disc caliper modification?
Post by: Trigger on February 11, 2020, 03:14:19 PM
A K0, K1 and K2 are not that straight forward as the later ones. They share the same caliper but, not the same arm or lower forks  ;)
Title: Re: Twin disc caliper modification?
Post by: sprinta on February 11, 2020, 03:45:42 PM
Thanks for the link Graham and your comments Kevin.

Yes at around £350 plus p & p and import cost it is a rather expensive way to go.

Whilst having the correct handed parts makes for an easier and neater conversion I can't really justify that sort of cost. Having to stretch the hydraulic pipe a bit will not match the LH side, but you can't see both side at the same time?

Perhaps there may be a way to modify the seats so that the nipple and hydraulic connections can be reversed?

I believe that there is also a handed brake pipe/hose brk available, but again if you can find one it is bound to be fairly expensive?

Andy
Title: Re: Twin disc caliper modification?
Post by: sprinta on February 11, 2020, 04:25:13 PM
Hi Sprinta,

I am in the process of gathering the parts to add a right disc to my 750 K4. A second hand Caliper and arm cost me £50 and a disc £20. The Yamiya Caliper and arm is £350 ish plus shipping and duties and looks like K0/1 type to me.

There is a olive of some type in the Caliper in the pipe location. I have removed it by threading it and pulling it out with a screw. I am planning to make brake pipe with a bubble flare and a long M10 tube nut. Hopefully this will seal.

The other issue I can see is securing the steel brake pipe to flexible to the mudguard. The left side has a correctly bent wire welded to the mudguard. Not sure yet what to do for the right side. Maybe a K0/1 type bracket can be adapted.

The conversion is far from straight forward. Where are you at with the job?

Cheers,

Kevin

Hi Kevin

You say that you have removed the 'olive'. Do you have a close up photo of it and what sort of seat is left in the caliper after removal?

Andy
Title: Re: Twin disc caliper modification?
Post by: 71 V12 on February 11, 2020, 04:39:54 PM
The seat is the same as the bleed valve side. As I mentioned I am hoping that a bubble flare will seal without the need for the unobtainium olive.
Title: Re: Twin disc caliper modification?
Post by: Bryanj on February 11, 2020, 04:47:16 PM
The op1 flare,or bubble as you call it, should work and you can get lont brake pipe nuts but make sure you have the correct thread as there ar two BUT you  will have to remove the end two or three threads on the nut as the threads in the calliper dont go all the way down.
Title: Re: Twin disc caliper modification?
Post by: 71 V12 on February 11, 2020, 06:26:18 PM
The internal dimension of the brake line inlet on the Caliper is identical to bleed nipple inlet except the port to the piston chamber is approx 0.5 mm larger. As Bryan mentions it is not threaded all the way. The thread is 1.25mm pitch.

Photo of the olive below.



[attach=1]
Title: Re: Twin disc caliper modification?
Post by: 71 V12 on February 11, 2020, 06:33:46 PM
This is brake pipe flare and long M10 x 1.25 tube nut I will try.
Title: Re: Twin disc caliper modification?
Post by: Bryanj on February 12, 2020, 01:06:59 AM
Id sooner see kunifer not steel pipe
Title: Re: Twin disc caliper modification?
Post by: sprinta on February 12, 2020, 10:27:11 AM
The seat is the same as the bleed valve side. As I mentioned I am hoping that a bubble flare will seal without the need for the unobtainium olive.

Hi

Olive is available from Yamiya. The attached photos from their site.

It is always possible that you could cut the appropriate nipple seat into the existing olive whilst still in place? It might rotate during the process and have to be removed? A new olive insert could be machined with the necessary seat for the nipple and then pressed in?

The suggested reverse flare on the hydraulic might work in the existing nipple seat face?

You can also increase the depth of the thread with the appropriate bottom tap
Title: Re: Twin disc caliper modification?
Post by: 71 V12 on February 12, 2020, 12:01:28 PM
I would like the conversion to look as near as possible a mirror of the left brake. I therefore hope to use the rear Caliper inlet for the brake pipe on the new right side brake, if that makes sense.

Plan A is to try a long brake tube nut that is not fully threaded as in the image above with the OP1 (bubble flare). If this seals great, job done.

If not

Plan B drill the rear Caliper port on the right Caliper and fit the removed olive which will clean up and use the OE brake nut and OP2 double flare.

Not sure why Bryan has a preference for cunifer, Honda used steel as do all other vehicle producers to this day. I think the surface coating may be better these days to prevent corrosion.

Anyway still at the parts gathering and refurbishing stage. I have most of the parts and fixings now except the brake line wire fixing bracket, but I will leave this until I’m into the job and can review the viable options.
Title: Re: Twin disc caliper modification?
Post by: SteveD CB500K0 on February 12, 2020, 12:27:49 PM
I didn’t even know the cunifer was a thing.

Had to Google it


Sent from my iPhone using Tapatalk
Title: Re: Twin disc caliper modification?
Post by: sprinta on February 12, 2020, 02:37:09 PM
The internal dimension of the brake line inlet on the Caliper is identical to bleed nipple inlet except the port to the piston chamber is approx 0.5 mm larger. As Bryan mentions it is not threaded all the way. The thread is 1.25mm pitch.

Photo of the olive below.



(Attachment Link)

Are you indicating that with the 'olive' removed both sides have the same seat face such that the nipple can be fitted to either side without any further modification?
Title: Re: Twin disc caliper modification?
Post by: 71 V12 on February 12, 2020, 04:38:46 PM
Hi Andy,

Visually the inlets look the same. The only difference that I can see is the hole at the bottom of the inlet on the brake pipe side is about 0.5mm bigger than the bleed inlet to allow for the olive insert.

Therefore to fit the olive in the bleed inlet that hole would need to careful enlarged. I guess you would want The olive to be a slight interference fit and perhaps a small tab of thread lock to seal it well.

Having said all of this, I really hope that the pipe will seal with right brake tube nut and OP1 flare.
Title: Re: Twin disc caliper modification?
Post by: Bryanj on February 12, 2020, 05:45:41 PM
Kunifer is way easier to bend, never rusts and seals better as it forms to the shapes better.
The only vehicle i would use original steel on would be a Citroen with hydromatic suspension as they have very odd ends with rubber seals
Title: Re: Twin disc caliper modification?
Post by: sprinta on February 26, 2020, 02:11:34 PM
I am considering doing a twin disc conversion on my 73 CB750 K2 and currently looking at all the parts I would require to do the modification.

On looking at the caliper whilst it it is straightforward to fit to the RH side they are handed in the sense that the nipple will now be closer to the fork tube and the hydraulic pipe now furthest away as the seats for the nipple and hydraulic pipe are different with the nipple using an inverse cone shape and the pipe a raised cone seat.

On looking at the relevant parts book page, see attached, there is an unnumbered part that looks to be some sort of olive insert above the pipe connection position.

Can anybody advise if this a push in seat that can be removed or if there is a relatively simple process so the nipple and hydraulic can be fitted as a mirror image of the LH side with the hydraulic pipe close to the fork leg?

Removing the 'olive' is fairly straightforward.

The bore of the olive is around 3.2mm dia and as such will take an M4 tap.

After tapping a few threads into the olive it can simply be drawn out with an M4 screw, nut and washers, see attached.

With the olive removed both threaded holes and seats are the same, at least on my caliper. So all that is required is to press the olive into the original nipple bleed hole and the screw the bleed nipple into the original brake pipe position.
Title: Re: Twin disc caliper modification?
Post by: 71 V12 on February 26, 2020, 08:40:57 PM
Neat job Andy.

Any thoughts on how to insert the olive into its new location?

Cheers,

Kevin
Title: Re: Twin disc caliper modification?
Post by: sprinta on February 27, 2020, 01:32:41 PM
Neat job Andy.

Any thoughts on how to insert the olive into its new location?

Cheers,

Kevin

Not 100% sure at the moment?

Need to put a couple or so more threads in the hole first to be sure the brake pipe flared end will clamp up and seal against the olive face once fitted.

Andy
Title: Re: Twin disc caliper modification?
Post by: sprinta on February 29, 2020, 11:31:13 AM
Thread just needed cleaning up.

Using the M4 screw just tapped it in and then screwed in the flared brake pipe to fully seat it.
Title: Re: Twin disc caliper modification?
Post by: 71 V12 on February 29, 2020, 06:48:31 PM
Simples, well done👍👍👍👍
Title: Re: Twin disc caliper modification.
Post by: sprinta on April 19, 2020, 06:54:04 PM
Part 1.

Have now sourced all the parts necessary and completed the twin disc setup.

I had picked up a NOS disc sometime ago and always wanted to do the twin disc setup, as much because I think it looks more balanced but also as I do use all my bikes the single disc quite frankly is very poor.

A number of the parts were used were from a GL1000, longer disc bolts, speedo drive and speedo drive chrome plate.  I decided on the GL1000 route because I thought it was a neater way to do it and it looked more original with the chrome speedo chrome plate. However, the GL1000 speedo drive does require some modification.

The caliper and mounting brks were also used parts which have been modified and refurbished with painting and plating as necessary.

The caliper fork mounting brk aligns correctly and does not require any removal of metal from either the fork or brk lugs. The bottom brk lug aligns but appropriate spacers need to be made for the top two lugs. I removed the lugs from the brk that were not required and the top rear lug has to be removed as it fouls directly against the wheel rim. 

Having reached the photo attachment limit I have continued in the next post.

Title: Re: Twin disc caliper modification?
Post by: sprinta on April 19, 2020, 07:26:39 PM
Part 2.

I used an original hose brk and removed the hose 'crook' and re-attached it by 180 deg's so that I could use the same brk on both sides for symmetry. I found the std brake hose a bit too short but had a Kawasaki Z900 A4 hose which has the same fittings but was a few mm's longer. (there would appear to be two lengths of the Z900 hose one is the same length as the CB750 and one is slightly longer)

A new solid brake pipe was formed and the ends flared.

Routing the hose requires a bit of faffing around as you have speedo cable, tach cable and the horn to miss when the forks compress in use. Being able to use the steering lock can also be compromised if you are not careful.

It has all installed without too much hassle but it will be necessary to have to remove the whole RH caliper and brk assy in order to remove the front wheel, which hopefully will only be when the tyre needs changing?

Have not had a chance to try it out due to the lockdown and now doubt I will have brake squeal in stereo but hopefully there will an improvement in the braking, if not it looks nice and to my eyes more balanced.

I am currently using the original master cylinder and will evaluate after some use as to if one with a larger piston is required. 
Title: Re: Twin disc caliper modification?
Post by: Lobo on April 19, 2020, 11:36:14 PM
Nice looking job Sprinta.

... I’ll be interested to learn if the braking is 2x improved. My K2 stops like a pig (even with sintered pads) ... it takes a lot of effort at the lever. If the (original?) master cylinder pressure output is effectively halved as now supplying 2 brakes, are you actually better off? This is doing my head in!
Title: Re: Twin disc caliper modification?
Post by: sprinta on April 20, 2020, 09:59:22 AM
Nice looking job Sprinta.

... I’ll be interested to learn if the braking is 2x improved. My K2 stops like a pig (even with sintered pads) ... it takes a lot of effort at the lever. If the (original?) master cylinder pressure output is effectively halved as now supplying 2 brakes, are you actually better off? This is doing my head in!

Thanks Lobo.

Hopefully it should improve the braking. I have a Suzuki GT750 and Kawasaki Z900 A4 with twin brakes which both have significantly better braking than the single disc of the CB750, though nothing compared to modern brakes.

I should have included that currently I have not change the original master cylinder.

As you have eluded to, it is not always necessary. Once I have had a chance to use and evaluate the new twin disc setup I will decide if the master cylinder needs replacing as well for one with a larger piston size?
Title: Re: Twin disc caliper modification?
Post by: Arch stanton on April 20, 2020, 01:56:11 PM
Please excuse my jumping in.
Many years ago. I converted my F1 to double disc. But kept the original master cylinder. But the lever was nearly at the bar, way too soft. Without much feel to it.
So I changed it for a GL1000 item. Much better by far.
I am using that very same front end in my current K1.
It does the job.
Title: Re: Twin disc caliper modification?
Post by: 71 V12 on April 20, 2020, 05:05:36 PM
Well done Andy,

That looks very tidy, nice job👍👍 I agree with your comment about the symmetry, does look better.

Do you have the part number for the GL1000 disc bolts? I guess they are available from DS? Good tip on the flex hose as well.

Need to get back to mine when I complete the huge list of DIY projects currently taking priority.

Let us know how effective the conversion is.

Cheers,

Kevin
Title: Re: Twin disc caliper modification?
Post by: philward on April 20, 2020, 06:14:10 PM
Great job - and the thread will be great for future converters
Title: Re: Twin disc caliper modification?
Post by: sprinta on April 21, 2020, 10:17:09 AM
Thanks for the replies and comments.

With respect to the use of a GL1000 master cylinder. Having only just recently had my original master cylinder re-anodised I would wish to continue using it but clearly if it proved not provide the necessary braking force then I would look to replace it with a GL1000 or similar version.

As indicated, there would appear to be two lengths of the Z900 brake hose, one is the same length as the Honda one and one is slightly longer, see attached. Fortunately the one I had was the longer  one. However, the std Honda one may be OK? It depends on how you intend to secure the hose. As I wanted to use the original hose brk I needed a slightly longer hose another type of retention may allow the std Honda hose to be used?

With respect to the GL1000 disc bolts. I think you will find that they are no longer available new, see attached.  I bought mine s/h from DK or Two Wheeled Spares on e-bay, see attached,together with the caliper and caliper brks etc. They currently still have a number of sets available. I was fortunate with the the bolts and plate I bought as the bolts were as new and the plate reusable, so you need to look at the photos carefull or ask them to give a condition status before purchase.

Title: Re: Twin disc caliper modification?
Post by: K2-K6 on April 21, 2020, 01:31:49 PM
Nice looking job Sprinta.

... I’ll be interested to learn if the braking is 2x improved. My K2 stops like a pig (even with sintered pads) ... it takes a lot of effort at the lever. If the (original?) master cylinder pressure output is effectively halved as now supplying 2 brakes, are you actually better off? This is doing my head in!

As you indicate,  it's hard to follow the theory through without seeing the inversions taking place. 

From running a contemporary system with twin disc and standard mastercylinder years ago on a 750 K2,  I can vouch for it being twice as powerful.  They really are potent in that arrangement and come close to the feel of a modern system in their ability to bring the tire to its limits of grip. That's accomplished with longer lever travel though. 

The larger reservoir used on some is simply to cope with any additional displacement of fluid during pad wear,  and avoid running it into aerating the line in extreme situation.

The leverage is dependent on the mastercylinder bore obviously,  but if you add another piston / caliper it changes the ratio insofar as the same effort at the lever now exerts something like twice the clamping force on both calipers. 

The original system was much more limited by the chosen ratio rather than any particular torque shortfall of both disc and caliper. They are quite a significant diameter on the 750 after all.


Title: Re: Twin disc caliper modification?
Post by: Lobo on April 21, 2020, 11:42:05 PM
... thanks K2-K6. You’ve forced me to think further, and what I see now is the same pressure being applied .... but over twice the area. (Ie the pressure is not halved; but rather the pad area - defacto braking force - doubled.)

Sprinta... be sure to keep us posted!

Title: Re: Twin disc caliper modification?
Post by: sprinta on April 22, 2020, 01:41:09 PM
... thanks K2-K6. You’ve forced me to think further, and what I see now is the same pressure being applied .... but over twice the area. (Ie the pressure is not halved; but rather the pad area - defacto braking force - doubled.)

Sprinta... be sure to keep us posted!

Will do as soon as we get out of this bloody lockdown.
Title: Re: Twin disc caliper modification?
Post by: Bryanj on April 22, 2020, 04:50:10 PM
Correct with pressure but you have to move twice the volume so lever comes farther back. When i twin disced a 500 back in the 70's Girling had just started doing Honda bits so bought a GL1000 one from them
Title: Re: Twin disc caliper modification?
Post by: 71 V12 on April 24, 2020, 12:33:05 PM
Thanks for the replies and comments.

With respect to the use of a GL1000 master cylinder. Having only just recently had my original master cylinder re-anodised I would wish to continue using it but clearly if it proved not provide the necessary braking force then I would look to replace it with a GL1000 or similar version.

As indicated, there would appear to be two lengths of the Z900 brake hose, one is the same length as the Honda one and one is slightly longer, see attached. Fortunately the one I had was the longer  one. However, the std Honda one may be OK? It depends on how you intend to secure the hose. As I wanted to use the original hose brk I needed a slightly longer hose another type of retention may allow the std Honda hose to be used?

With respect to the GL1000 disc bolts. I think you will find that they are no longer available new, see attached.  I bought mine s/h from DK or Two Wheeled Spares on e-bay, see attached,together with the caliper and caliper brks etc. They currently still have a number of sets available. I was fortunate with the the bolts and plate I bought as the bolts were as new and the plate reusable, so you need to look at the photos carefull or ask them to give a condition status before purchase.

Hi Andy, I ordered the GL1000 bolts from DK which I received today, and as with you in as new condition 👍👍👍

Do you have a Kawasaki part number or application for the longer brake hose?

Many thanks,

Kevin
Title: Re: Twin disc caliper modification?
Post by: sprinta on April 24, 2020, 04:39:14 PM
Thanks for the replies and comments.

With respect to the use of a GL1000 master cylinder. Having only just recently had my original master cylinder re-anodised I would wish to continue using it but clearly if it proved not provide the necessary braking force then I would look to replace it with a GL1000 or similar version.

As indicated, there would appear to be two lengths of the Z900 brake hose, one is the same length as the Honda one and one is slightly longer, see attached. Fortunately the one I had was the longer  one. However, the std Honda one may be OK? It depends on how you intend to secure the hose. As I wanted to use the original hose brk I needed a slightly longer hose another type of retention may allow the std Honda hose to be used?

With respect to the GL1000 disc bolts. I think you will find that they are no longer available new, see attached.  I bought mine s/h from DK or Two Wheeled Spares on e-bay, see attached,together with the caliper and caliper brks etc. They currently still have a number of sets available. I was fortunate with the the bolts and plate I bought as the bolts were as new and the plate reusable, so you need to look at the photos carefull or ask them to give a condition status before purchase.

Hi Andy, I ordered the GL1000 bolts from DK which I received today, and as with you in as new condition 👍👍👍

Do you have a Kawasaki part number or application for the longer brake hose?

Many thanks,

Kevin

Hi Kevin

Good that you also managed to get a good set of bolts from DK.

With respect to the longer Kawasaki hose. As indicated there appears to be two possible lengths available. The longer one is around 380mm compared to the shorter one which is around 360mm, which looks to the same length as the std Honda ones?

The Kawasaki code No is: 43059-011 however, I can't advise if that is the longer or shorter version you would need to ask whoever you purchase it from it's length before purchase.

I would also hold back until you decide how you are going to anchor the hose as you may well find that the std Honda one may suffice?

Andy
Title: Re: Twin disc caliper modification?
Post by: 71 V12 on June 08, 2020, 09:28:44 AM
Hi Andy,

Did you get a chance to ride since the twin disc upgrade?

Interested to know your impression of the brake performance.

Regards,

Kevin
Title: Re: Twin disc caliper modification?
Post by: sprinta on June 08, 2020, 11:10:31 AM
Hi Kevin

I have been a bit amiss by not following up with impression of the twin disc conversion.

I've done around 200 miles on it over the last couple of weeks or so.

The extra weight certainly took me by suprise on the first ride with the extra weight dropping the front into corners quiet noticeably, but I soon got used to it and it now give a sense that the front end is firmly planted to the road.

Yes, the twin disc does make a considerable diffierence and certainly worth it, in my opinion.

As the pads I used were a bit thick I had to reduce their faces and I also bevelled the edge's, perhaps a bit too much as only about 40% of the pads are currently in contact with the disc but even so it is a significant improvement and will clearly improve as more of the pads wear into contact with the disc.

No, they are not in the same league as modern brakes but they are certainly as good as twin disc bikes of the same period such as the Suzuki GT750 and the Kawasaki Z900A4, both of which I own so can comfortably make the comparison.

The std master cylinder works just fine and I can see no reason to go for anything larger, such as the GL 1000 etc.

One thing I have noticed is that the speedo cable runs very close to the outer edge of the disc and after the first run it had cut into the outer plastic covering of the cable. I have overcome this to a degree by packing the cable to the mudguard stay and time will tell as to if this is a satisfactory solution?

So overall I am very happy with the conversion which I have found to improve the the braking, as long as you accept the limitaions of any twin disc setup of that period.

The only down side, as previously expressed, is that it will be necessary to have to remove the whole caliper and brk assy to get the front wheel out, which will hopefully only ever be needed to change the tyre.

Andy
Title: Re: Twin disc caliper modification?
Post by: robvangulik on June 08, 2020, 01:26:08 PM
Drilling the discs can make a considerable difference in weight! I removed 1,5 kg in total from 2 discs.
Title: Re: Twin disc caliper modification?
Post by: 71 V12 on June 08, 2020, 05:55:51 PM
Hi Andy,

Many thanks for the update, it sounds like the effort and cost is well worthwhile.

I need a day or so to complete the job on my K4, your information has been very helpful and great motivation👍👍

Regards,

Title: Re: Twin disc caliper modification?
Post by: sprinta on June 08, 2020, 08:44:33 PM
Drilling the discs can make a considerable difference in weight! I removed 1,5 kg in total from 2 discs.

Totally agree that losing some weight would help and I'm sure that braking would be further improved with thiner discs as they would heat up much quicker.

But as I want to keep the bike as std as possiible neither are options or routes I can go down, such is the price of originality, even with twin discs.
Title: Re: Twin disc caliper modification?
Post by: Bryanj on November 06, 2020, 12:23:57 AM
Kunifer never corrodes and is a damn sight easier to form to shap, also gives a beter flare in my experience
Title: Re: Twin disc caliper modification?
Post by: sprinta on November 06, 2020, 11:59:56 AM
Kunifer never corrodes and is a damn sight easier to form to shap, also gives a beter flare in my experience

That is why I used it to make the RH solid brake line. However, it does have a slightly coppery finish so I had a length zinc plated before bending and flaring it to match the original finish of the LH side.

I see that all new replacement solid brake lines have an olive finish.
Title: Re: Twin disc caliper modification?
Post by: Erny on November 06, 2020, 12:54:05 PM
I bought original new pipe (still available) so same design as stock, preparing for dual disc brake on my K7 too. Just still did not find caliper and holder stuff... I plan to use GL1000 MC
Title: Re: Twin disc caliper modification?
Post by: sprinta on November 06, 2020, 04:37:17 PM
I bought original new pipe (still available) so same design as stock, preparing for dual disc brake on my K7 too. Just still did not find caliper and holder stuff... I plan to use GL1000 MC

You say that you have bought an original new pipe? That must be for the std LH side as I am not aware that Honda ever did one for the RH side?

There is no need to fit a GL1000 MC, as the original K series MC is fine. But if you feel happier with a GL1000 MC then do so.
Title: Re: Twin disc caliper modification?
Post by: Erny on November 06, 2020, 09:34:57 PM
yes, it is LH side no pb to adapt it to RH side

My mate has K7 with dual disc setup with stock MC, it brakes really good, but I do not like long travel of lever and soft feeling
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