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Replacing the front master cylinder

  • Thread starter Thread starter SamCrow
  • Start date Start date
S

SamCrow

Guest
On my '82 GS650GL I've got two problems (amongst many!):
  1. The mirror has snapped off (while trying to remove it), with no way of extracting the remainder
  2. The PO damaged the threads that holds the master cylinder to the handlebars
I can live with the latter problem (as I've got it as tight as it will go), but combined with the former I'm thinking about swapping out the front master cylinder completely and wondered if there were any suggested replacements?
 
If it were me I would drill and tap the handlebar strap holes larger then drill out and use a helicoil on the mirror hole.

If you want to get a new master cylinder you should look around to see what you like. A used one from online or salvage yard might be the best bet. There are 4 things you need to watch for.

1) make sure the master cylinder is designed to mount on the size handlebars you have.
2) make sure the mirror thread is the right direction (some have reverse threads)
3) make sure the master cylinder is designed for the amount and size of calipers you have. (some are designed for single calipers, some are designed for dual calipers but the actual calipers might be smaller bore than yours etc.)
4) make sure the master cylinder is designed for the type of handlebars. Some clip on style will be at an angle if you try to mount them to a regular handlebar.
 
Mike's XS sells nice new ones in different bore sizes. No worries about sludge or clogs.
 
Funny you should ask. I've just ordered a modern Suzuki MC for my '82 Gs1100. I went into the Suzuki showroom and found that the 650 V-Strom has a similar MC to my bike, has twin disks like mine and sits about the same. As Razor suggested, I checked that the bars are 7/8th, the angle is about the same, ie not slanted for clip-on bars, and the new one even has an adjustable lever.

It should be just what I need to improve the lever feel on my bike. My original MC was toast so I had put on an era-correct GS1100 MC but the lever has to be pulled right back to the bars to work. Everything else is good - new lines, completely overhauled callipers, etc. The brakes work, and work well, but I want a better lever feel. I also just received new discs. They should help I hope!

I'm kinda partial to being able to stop.
 
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