1978 kz650B front master cylinder diaphragm

skooterbum4real
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1978 kz650B front master cylinder diaphragm

29 Jun 2015 15:08 - 29 Jun 2015 15:09

I've just disassembled two front master cylinders for the kz650B, and on both units the diaphragms had dissolved around the outer edge. They had turned into a very soft tar like material.

I'm guessing age, or possibly someone had topped them off with an incompatible brake fluid. This leaves me with two unusable masters, unless I can find new Diaphragms.

Anyone have an idea where I might be able to find one of these ?? By the way, these are the tapered, or triangle type masters.

If not, does anyone have a good recommendation for the aftermarket masters that are available ??

1978 KZ650B 8,500 miles
1976 KZ750 Twin
SPECIAL CONSTRUCTION V-TWIN CHOP

Last edit: 29 Jun 2015 15:09 by skooterbum4real.

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SWest
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Re: 1978 kz650B front master cylinder diaphragm

29 Jun 2015 17:20

#678771

Too bad, I was going to offer you one I bought that was too small. It's rectangular.

Steve

Z1b1000 1975 Z1b
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229

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650ed
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Re: 1978 kz650B front master cylinder diaphragm

29 Jun 2015 17:43

#678776

skooterbum4real wrote: I've just disassembled two front master cylinders for the kz650B, and on both units the diaphragms had dissolved around the outer edge. They had turned into a very soft tar like material.

I'm guessing age, or possibly someone had topped them off with an incompatible brake fluid. This leaves me with two unusable masters, unless I can find new Diaphragms.

Anyone have an idea where I might be able to find one of these ?? By the way, these are the tapered, or triangle type masters.

If not, does anyone have a good recommendation for the aftermarket masters that are available ??

These folks (see link below) say they have a reproduction diaphragm - part number 43028-1002. The diagram below shows that as the part number for the KZ650-B2 front master cylinder diaphragm. Ed

www.kurveygirl.com/shop/product_info.php?products_id=795

Attachment 00003b-13.jpg not found

1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

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skooterbum4real
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Re: 1978 kz650B front master cylinder diaphragm

30 Jun 2015 07:50

#678827

SWEET !! Thanks 650ed !!
I was sure there was absolutely no place to find them. I really appreciate this Ed !!
With the low mileage of this bike, and the great condition of the rest of the master cylinder, I was hoping to keep this original master on the bike.

1978 KZ650B 8,500 miles
1976 KZ750 Twin
SPECIAL CONSTRUCTION V-TWIN CHOP

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skooterbum4real
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Re: 1978 kz650B front master cylinder diaphragm

04 Jul 2015 20:51

#679455

Got the diaphragms in today. Fast shipping, and a great fitting part !!
Thanks again for the heads up on these folks 650ed !!

1978 KZ650B 8,500 miles
1976 KZ750 Twin
SPECIAL CONSTRUCTION V-TWIN CHOP

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Re: 1978 kz650B front master cylinder diaphragm

05 Jul 2015 06:47

#679491

I'm glad I could help! Ed

1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

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