Anyone Know The Make Of This Master Cylinder

[Vincent]

There were two types fitted to my bike apparently and I need to know which mine is to order a repair kit. Tokiko or Nissin?

https://i77.photobucket.com/albums/j71/Drewskovitch/Jap%2070s%20bike%20toys/Bike%20toys/P1013245_zpsh4m071rz.jpg
https://i77.photobucket.com/albums/j71/Drewskovitch/Jap%2070s%20bike%20toys/Bike%20toys/P1013244_zps0dql0zfn.jpg
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[Fizzer Thou]

As the bike in the pic looks like a GT750 (the temp gauge between the speedo & tacho are a giveaway) I would suggest this is what you are looking for

https://www.robinsonsfoundry.co.uk/content/pages/shop/parts/Suzuki/GT/GT750%20Kettle/J%20K%20L%20M%20A%20B%20(1972-1977)/gt750frontmastercyllmab.htm
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[Vincent]

Thanks Fizzer....someones picking me up some parts in Oz and I need to know the make of the Master Cylinder for the repair kit as apparently, they used two different types. I think the one I have may be a more modern replacement from....... I don't know. Weird though as it has a Suzuki "S" on it I want to go with the parts from OZ as they're rediculously cheap. They're from a Japanese eBay seller with good rep called "cruzinimage" who no longer posts to the UK. His carb kits are about £20...for 3 sets
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[Ed Case]

Tokico by the look of it.

[Vincent]

[Ed Case]

[Vincent]

Cheers...the more I look at it, the more it looks like a modern replacement to me, I've seen them advertised abroad. The circlip looks impossible to get at, none of the circlip pliers I've got will get down there

https://i77.photobucket.com/albums/j71/Drewskovitch/Jap%2070s%20bike%20toys/Bike%20toys/P1013247_zps0s5wpdfi.jpg
https://i77.photobucket.com/albums/j71/Drewskovitch/Jap%2070s%20bike%20toys/Bike%20toys/P1013246_zpssydukvzv.jpg
https://i77.photobucket.com/albums/j71/Drewskovitch/Jap%2070s%20bike%20toys/Bike%20toys/P1013248_zpscvb5rugl.jpg
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[Vincent]

I think the problem's solved, someone on the kettle club has told me it's too small for dual disc anyway. I think the extra disc was optional and it sounds like Suzuki didn't bother to upgrade the M/C when you had it fitted
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[Fizzer Thou]

I do not ever remember seeing a GT750 without a second disc,even when Bike magazine tested the bike alongside a CB750F1 all of those years ago when they were first introduced.So if you get firm pressure when using that master cylinder,why suspect that it would not be good enough?

The comment about the master cylinder looking very much like one from a Honda four was what I was thinking,except for the ridged bit where the banjo bolt goes into the master cylinder.Presumably this is where the rubber boot goes over and is held in place by the ridge.But I have never seen this on similar Honda four master cylinders and I have had quite a few.

This pic from a 1976 Honda catalogue shows a similar looking master cylinder which also looks like the one fitted to a CB550K3 with the white plastic part.But the one shown in Vincent's pic shows a ridged plastic part,which the Honda ones did not have.

https://i666.photobucket.com/albums/vv23/WiNot_Rhencullen/Snaps/HondaLeaflets005.jpg

This pic of a CB750SS (essentially a CB750F2 dressed up by Colin Seeley) shows the standard master cylinder for that bike,feeding the standard double front discs.The master cylinder itself was very similar to the one on the CB550K3 except with a taller reservoir.

https://i666.photobucket.com/albums/vv23/WiNot_Rhencullen/Snaps/HondaLeaflets022.jpg

I had a twin disc conversion on one of my CB550s and used the standard master cylinder,except with Aeroquip hoses and Ferodo brake pads.With careful bleeding the brake was effective enough to lock the front wheel (45 in a 30 )
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[Vincent]

[Fizzer Thou]

I have looked through countless images of the GT750K (the original disc braked Kettle) on goggle images and not one has a single disc.

But....

The original wire spoked GS750 came with a single front disc,with the option to go with a second disc that Suzuki quickly included as standard,due to the success of the bike in proddy racing.

While looking for images on photobucket for a standard early model GS750 I found this picture of a Suzuki master cylinder

https://i88.photobucket.com/albums/k171/Wreckamundo/1978%20Suzuki%20GS750%20Parts/Master.jpg

https://i563.photobucket.com/albums/ss73/dksparesebay/Neils%20Bikes%203/DSC00857.jpg
https://i563.photobucket.com/albums/ss73/dksparesebay/Neils%20Bikes%203/DSC00849.jpg
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[Vincent]

This is the correct one apparently, note the circled "D" for "Dual" on the res. I presume my old one is 1/2" and this is 9/16":-

https://i77.photobucket.com/albums/j71/Drewskovitch/Jap%2070s%20bike%20toys/Bike%20toys/GT%20dual%20mc_zpsdnqji9km.jpg

Having an extra disc can change the size of M/C bore needed. Think of all that extra volume of fluid it has to move...the extra brake hose and what's in the caliper, it's bound to affect the feel on the lever I'd have thought as it needs to move further.
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[Fizzer Thou]

With a second disc you are only moving the fluid within the system a very small amount ie. that distance that the disc pads have moved away from the disc when you let go of the brake lever.You might get slightly further lever travel,but as I found with the modified CB550,with careful bleeding and other modifications the difference was minimal.
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[Kickstart]

Hi

Also possible that they fitted a large bore m/c as standard and just let those with a single disk put up with dead feeling brakes needing loads of pressure.

All the best

K
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[Vincent]

[Vincent]

You're right Fizzer...the Kettle was indeed only ever double disc
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[smegballs]