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  #1  
Old 10-19-2011, 04:32 PM
bikemight bikemight is offline
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master cylinder

Hello. I'm new to the sight and recently bought a 1980 xs1100 mns. I'm looking for a new master cylinder. Does anyone no of a after market master cylinder that would work for my bike? I was interested in one that was on the mikes xs site but when i asked them if it would work for my bike they said they didn't have the schematics on the xs1100. So it may or may not work. Has anyone here used a master cylinder from the mikes xs site or know of another one that would work. Any help would be greatly appreciated thanks.
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Old 10-19-2011, 04:35 PM
'OlGuiltyBoy 'OlGuiltyBoy is offline
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I think if you look on the bottom of the cylinder there is a size/diameter. You just have to get one either that size or a tad bit smaller ... Don't go too small though because if you tap the brakes you be doing a stoppie and dump your bike
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  #3  
Old 10-19-2011, 04:39 PM
'OlGuiltyBoy 'OlGuiltyBoy is offline
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http://www.xs11.com/forum/showthread.php?t=34389


Check out this thread too ... I basically had the same question
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Guilty Ones M.C.
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1980 Standard G
2001 CBR 929RR
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  #4  
Old 10-19-2011, 04:56 PM
bikemight bikemight is offline
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Thanks. I think I'm going to go with the 16mm bore dual disk master cylinder that is on mikes xs site. It's all black and will look good on my mns. I also just installed new ss lines and brake shoes. Hopefully I can get it on the road before the weather in Seattle goes south.
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  #5  
Old 10-19-2011, 04:59 PM
'OlGuiltyBoy 'OlGuiltyBoy is offline
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Quote:
Originally Posted by bikemight View Post
Thanks. I think I'm going to go with the 16mm bore dual disk master cylinder that is on mikes xs site. It's all black and will look good on my mns. I also just installed new ss lines and brake shoes. Hopefully I can get it on the road before the weather in Seattle goes south.
I'm not sure what stock size is, if you find out let me know ... lol. I put all that on hold until I finish up the exhaust. Had too much going on at once. but like I said make sure 16 isn't too small. Those SS brake lines are going to add some power too because they don't expand like the old rubber hoses...
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Guilty Ones M.C.
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1980 Standard G
2001 CBR 929RR
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  #6  
Old 10-19-2011, 05:12 PM
bikemight bikemight is offline
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Pretty sure the 16mm is stock for the mns but I'm not sure about other models.
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  #7  
Old 10-19-2011, 05:13 PM
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natemoen natemoen is offline
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Quote:
Originally Posted by bikemight View Post
Thanks. I think I'm going to go with the 16mm bore dual disk master cylinder that is on mikes xs site. It's all black and will look good on my mns. I also just installed new ss lines and brake shoes. Hopefully I can get it on the road before the weather in Seattle goes south.
you have the right one there. have you tried cleaning your current master cylinder?
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1978 XS1100E
K&N Filter
#45 pilot Jet, #137.5 Main Jet
OEM Exhaust
ATK Fork Brace
LED Dash lights
Ammeter, Oil Pressure, Oil Temp, and Volt Meters

Green Monster Coils
SS Brake Lines
Vision 550 Auto Tensioner

In any moment of decision the best thing you can do is the right thing, the next best thing is the wrong thing, and the worst thing you can do is nothing.

Theodore Roosevelt
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  #8  
Old 10-19-2011, 09:20 PM
crazy steve crazy steve is offline
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Quote:
Originally Posted by bikemight View Post
Pretty sure the 16mm is stock for the mns but I'm not sure about other models.
All of the XS11s (except for the '81 MNS/XJ with their 'split' braking system) used a 11/16" bore master (about 17.5 mm). The 16mm will work, but will give a bit more lever travel...
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  #9  
Old 10-19-2011, 09:33 PM
mack mack is offline
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Brakes

I used the one from Mikes on my 79 SF, works great with SS lines. That braking system steve refers to gave me the creeps on my 81 LH. I've completely removed it and and went with the smaller rea rMC from a 79 (thanx Andreas) and will use the Mikes 16 mm front MC.
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  #10  
Old 10-19-2011, 09:37 PM
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XS1100_OEM4ME XS1100_OEM4ME is offline
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Welcome

Quote:
Originally Posted by bikemight View Post
Hello. I'm new to the sight and recently bought a 1980 xs1100 mns. I'm looking for a new master cylinder. Does anyone no of a after market master cylinder that would work for my bike? I was interested in one that was on the mikes xs site but when i asked them if it would work for my bike they said they didn't have the schematics on the xs1100. So it may or may not work. Has anyone here used a master cylinder from the mikes xs site or know of another one that would work. Any help would be greatly appreciated thanks.
Welcome to the site, sounds like you may have already ordered the new M/C for your bike. If so, it should work fine, the smaller bore will increase the PSI but reduce the amount of fluid per leaver movement. All that means is your leaver may move more but will act stronger when engauged, especialy with the SS lines. What was wrong with the OEM M/S? Most can be cleaned inside with scotch bright and re assembeled with new fluid to work fine
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1979 XS750 Special (my 1st Special)
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  #11  
Old 10-19-2011, 10:07 PM
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petejw petejw is offline
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fwiw my bike 81R and the 80 standard are fitted
with 5/8 in bores, so theyll also work without
any problems.
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new owner of
08 gen2 hayabusa


former owner
1981 xs1100 RH (aus) (5N5)
zrx carbs
18mm float height
145 main jets
38 pilots
slide needle shimmed .5mm washer
fitted with v/stax and uni pod filters

http://www.youtube.com/watch?v=3pA8d..._order&list=UL
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  #12  
Old 10-19-2011, 10:49 PM
bikemight bikemight is offline
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I bought the bike and the p/o had an existing problem of the brakes locking and not relieving pressure. He had also broke off the mirror and broke of a tap in the mirror mount. I bought a rebuild kit and cleaned it out meticulously. It was sparkling but after putting in the rebuild kit I still had the same trouble. I have already taken the mc off twice now with no new results. I will just feel safer knowing the master is new and can mount a new mirror. I want to get it on the road before the season changes. I appreciate the help and I'm sure this won't be my last question. I did end up ordering the 16mm mc from mikesxs and should have it on this weekend. Barring any rain on sunday should get it on the road.
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  #13  
Old 10-19-2011, 11:01 PM
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Rasputin Rasputin is offline
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Sounds like the spooge hole in the existing M/C has not been cleaned out and is plugged. The Mirror mount is just one enormous PITA too.
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  #14  
Old 10-19-2011, 11:04 PM
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petejw petejw is offline
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Quote:
Originally Posted by bikemight View Post
I bought the bike and the p/o had an existing problem of the brakes locking and not relieving pressure.
thats a common problem with these m/c,
if u remove the top and look inside there are 2
holes the smallest hole (spooge hole) blocks up and
usually needs a poke with some wire to clear it, that hole
relieves the pressure and returns the fluid back to the
reservior. You could try this til u get ur new 1.
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new owner of
08 gen2 hayabusa


former owner
1981 xs1100 RH (aus) (5N5)
zrx carbs
18mm float height
145 main jets
38 pilots
slide needle shimmed .5mm washer
fitted with v/stax and uni pod filters

http://www.youtube.com/watch?v=3pA8d..._order&list=UL
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  #15  
Old 10-19-2011, 11:07 PM
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natemoen natemoen is offline
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Yup, spooge hole. It is a very small hole specifically for releasing the pressure.
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KD9ARL

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1978 XS1100E
K&N Filter
#45 pilot Jet, #137.5 Main Jet
OEM Exhaust
ATK Fork Brace
LED Dash lights
Ammeter, Oil Pressure, Oil Temp, and Volt Meters

Green Monster Coils
SS Brake Lines
Vision 550 Auto Tensioner

In any moment of decision the best thing you can do is the right thing, the next best thing is the wrong thing, and the worst thing you can do is nothing.

Theodore Roosevelt
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