ALSO NOTE: Mirror mount has (yamaha type) left hand Thread.
This is to prevent mirror arm breaking if you whack something...
the mirror post just loosens up instead of snapping off!!! genius!!!!

If you don't want to get a Yamaha style mirror,
just get an adapter
EMGO part number 20-28142

Question: 

Will this item fit a 70's/80's metric bike with single front disc? 

Answer: 
Not sure what you mean by "fit"...
This only fits on 7/8" handlebars, so most japanese bikes have 7/8" bars, clamps and controls, including stock Suzuki bikes.

So in that sense, this will "fit" on your handlebars.  If you have a fairing, maybe not, because this
is on the large end of the vintage master cylinder size spectrum  :-)

But "fitment" is not the only criteria for choosing a master cylinder.

This has a 22mm bore size, what is the stock bore size on your master cylinder?

As you know, the bigger the bore size on the master, the more fluid gets pumped through the lines and calipers,
and the firmer the lever feel.

This might feel too firm if you have a 13mm 14mm or 15mm, or 1/2" or 5/8" master.

On  the other hand, if you are still running 45 year old brake lines...  
then this will very much help to firm up the lever feel.
 

Question:
Just want to make sure this will work for a 1979 GS1000 with twin discs? The OEM master cylinder is a 5/8 unit

answer:
hi, yes this will work, but it is bigger than 5/8",
so they work great with old rubber lines, however if you are running
steel braided lines, it may feel to stiff, or "wooden".....
also note:
These have left hand 10mm mirror hole threads,
so you will need to get Yamaha right side mirrors, or a RH thread mirror adaptor.
EMGO part number 20-28142

EMGO part number 20-28142230795918444 is the ebay number for the banjo/brake light switches.



VINTAGE SUZUKI GS Series type
MASTER CYLINDER -
ROUND STYLE

NOTE: NO Banjo bolt included
the manufacturer has decided
not to include a banjo bolt any more...

uses:
   standard type honda/yamaha/ 10mm x M1.25 banjo bolt
   Does NOT use stock SUZUKI Banjo Bolt (10mm x M1.00)

also NOTE: NO BRAKE LIGHT SWITCH!!!!!
 
( i have banjo brake light switches! more info below)

I do carry an adaptor- a banjo bolt brake switch-
please see Item number:   230795918444


         
GREAT FOR ANY 7/8" BAR DUAL DISC BIKE!
Much firmer lever feel, even with old rubber brake lines!
Fantastic Upgrade!

NOTE: Does not fit some GS models, like the GS650, if you have the stock switch housings.
the switch housing can interfere with the lever. 
You are welcome to try to make it work, but if you return it,
you will have the pay the shipping charges.

NOTE: NO Banjo bolt included
the manufacturer has decided
not to include a banjo bolt any more...
uses:
   standard type honda/yamaha/ 10mm x M1.25 banjo bolt

also NOTE: NO BRAKE LIGHT SWITCH!!!!!
( i have banjo brake light switches! more info below)


For those of us who have rebuilt a master cylinder that's seized and gunked up after sitting for 10+ years,
i don't have to tell you how much time you'll save yourself, by JUST buying a new master cylinder...
I've had it with spending $40 on a rebuild kit, and then having the master leak anyway, because the
aluminum inside the bore had oxidized so badly that not even a brake hone could make it seal....
frustation, waste of valuable time, and for what, a master that still looks old and crappy?

are you kidding me?     hell no.  NEVER AGAIN. 
Now I Buy a beautiful, Brand NEW master, ....no headaches with bleeding or leaks,
cleans up the cockpit/bar area, and works better than the original. 
what was i thinking? ( oh yeah, i thought i was gonna save $40 by rebuilding it myself...lol)

Absolutely my favorite for any SUZUKI GS, YAMAHA XS, HONDA CB, KAWASAKI KZ
Series with dual disc or for Dual Disc conversion

THIS IS "DA BOMB" FOR YOUR XS650 dual disc conversion, & XS750 XS850 XS1100 ~   
ANY XS, XJ, CB, KZ or GS with DUAL DISCS will benefit!!!

Satisfaction Guaranteed!!!
check my feedback!!!!
you will NOT BE DISAPPOINTED!!!!!!!!!
this Master simply ROCKS :-)

( Plus, it looks vintage, and as my British buddies say, "it works a treat!")

I also have a matching clutch lever assembly:
please see ebay item #'s: 221178461649  &
230903028366  

22mm bore master cylinder.

 These have yamaha left hand 10mm mirror hole threads.

Again, NOTE: Mirror mount has yamaha type left hand Thread.
This is to prevent mirror arm breaking if you whack something...
the mirror post just loosens up instead of snapping off!!! genius!!!!

(other brands use right hand threads on the stock masters)
(You can buy adaptors or yamaha style mirrors)
~ I can tell you where to get mirror adaptors.

It is for 7/8" bars.
10mm x 1.25mm banjo threads

Note: this has no brake light switch,
many older bikes have an inline hydraulic pressure switch hooked up to their brake line.

BUT, I do carry an adaptor-
a banjo bolt brake switch-
please see Item number:   230795918444

I will combine shipping and refund via paypal!!!
you will not pay shipping on the banjo bolt!!!


This will work on any 70's and most 80's  disc brake setup with 7/8" bars. 
This does not have a brake light switch.
If your stock master cylinder has a brake light switch mounted on it, this master will work to activate your brakes,
but it won't switch on the light unless you use a banjo bolt brake light switch.
You can either rely on your rear brake switch or get a banjo bolt switch.
(Many Hondas have a hydraulic switch that is separate from the master cylinder, in which case this is a direct fit.)

Comes with the master cylinder body and bar clamp,
with plastic cap and rubber diaphragm, but no banjo bolt,  sorry!
 

Please check out my ebay store:  
http://stores.ebay.com/CycleSmith-parts-accessories

just type-in whatever you are looking for, in the search window!

Satisfaction Guaranteed!!!!

This is the best OEM type vintage master
i have found for the price!
Looks almost exactly  like the cool  
masters of yesteryear!

I have NEVER had a return on these masters!
Any problem with it, i will exchange, and i pay the shipping!
----------------------------------------------------------------------
ACTUAL EBAY FEEDBACK:

PERFECT 5 MIN INSTALL, BLED FAST, BEST FRT BRAKES I EVER HAD!  HONEST SELLER	Buyer: Member id fishypoop1	During past month
	SUZUKI GS MOTORCYCLE Master Cylinder Dual Disc GS1000 GS850 GS750 GS650 GS550

product as advertised, Prompt shipment- Satisfied buyer!	Buyer: Member id csselbuy7	During past month
	MOTORCYCLE Master Cylinder Yamaha Honda Kawasaki Suzuki Dual Disc conversion 7/8

Parts arrived today!! FAST !! Great addition twin disc on CB450!!!	Buyer: Member id mr_chau	Past 1 month
	MOTORCYCLE Master Cylinder Yamaha Honda Kawasaki Suzuki Dual Disc conversion 7/8

 

very fast shipping	Buyer: Member id aak4	May-26-14 18:49

NICE!!! AAAA+++++	Buyer: Member id patxihot	Jun-10-14 15:18
	MOTORCYCLE Master Cylinder Yamaha Honda Kawasaki Suzuki Dual Disc conversion 7/8

NOTE: the bike below is a dual disc XS750, gives a much firmer lever feel than a smaller master.  

These bikes, especially the "Special" models, are notorious for soft,spongy lever feel.

Contact me with any problems.
Please contact me before leaving neutral or negative feedback!
I have a 100% feedback rating !
as always, ask questions first before buying!