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Discussion Starter · #1 ·
Need master cylinder for a 1983 Gl650. Lots of kits.... and questionable aftermarket units in various sizes..many without the brake light switch. I checked a few of the bigger named parts outlets.... mostly kits. Thank you. :cool:
 

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1983 cx650c
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I put an eBay Chinese master on my 650c three years ago, no problems at all since. It was cheap, came with the clutch lever stuff also which I didn't need. I also put a new stainless brake line, and rebuilt the caliper with new pistons and seals on at same time. The master cylinder has brake switch and it all works great! Looks nearly identical to original also.
 

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1983 cx650c
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Just looked on eBay and current offerings are $17, black painted, brake light switch installed. Rebuilding a corroded old master cylinder can be very frustrating and often unsuccessful. The one I got works great and was very easy to bleed during installation.
 

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1978 CX500 "The Grub", 1983 GL650I "Nimbus"
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Does your 650 Custom have dual discs up front? I'm not very knowledgeable about that variant.
 

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Yes...get the correct bore size.....dont just go on the ebay listing
 

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The "yes" refers to correct bore choice single vs.dual........
 

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1983 cx650c
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I see 14 and 16mm bore sizes on eBay for under $20. Kits are more than complete cylinders with levers,,,
 

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'84 CX650E that is evolving into a GL500
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The problem with master cylinders from Chinese eBay sellers is that some are great and some are garbage and you can't tell from the pics or the price.

I fell into that trap some years ago when I bought 2 to replace the ones on my bikes. I installed one on Eccles right away but before I got around to installing the other one on Mr.H the first one failed.
I bought 2 more from an eBay listing that a knowledgeable forum member posted a link to and they have held up well other than the sight glasses eventually soften. But replacement sight glasses are cheap and easy to install so I don't mind doing that when I replace the fluid every few years.

These days we usually recommend buying from one of the known places like DSS or at least from a US eBay seller.
 

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Discussion Starter · #9 ·
As Sidecar Bob was type'n his reply I was on the net and bought a Chinese unit off eBay. Larger bore with the brake light switch. Once the caliper kits, pads, fork seals and dust caps hit my door steps..I'll get busy. In the spring I'll toss it on the trike. Once I get it to stop better.. I'll ride it more often... only took it out twice this season. Thanks Guys...
 

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Discussion Starter · #11 ·
Ordered this unit.... I'll use the other one on a Cb450 I'm working on.... last plated 20 years ago. Thanks
 

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1982 GL500 81 BMW R100 2010 HD E-GLIDE
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The problem with master cylinders from Chinese eBay sellers is that some are great and some are garbage and you can't tell from the pics or the price.

I fell into that trap some years ago when I bought 2 to replace the ones on my bikes. I installed one on Eccles right away but before I got around to installing the other one on Mr.H the first one failed.
I bought 2 more from an eBay listing that a knowledgeable forum member posted a link to and they have held up well other than the sight glasses eventually soften. But replacement sight glasses are cheap and easy to install so I don't mind doing that when I replace the fluid every few years.

These days we usually recommend buying from one of the known places like DSS or at least from a US eBay seller.
I bought a one for my gl500 5 years ago-sight glass became useless so JB Weld over it . Been a year & no issues .Paul
 

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'84 CX650E that is evolving into a GL500
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As I said, the sight glasses are cheap and easy to change. I figure it isn't a big deal to replace it when I do the fluid and if the length of time before the first one started to soften is an indication it's a good way to tell it's time to change the fluid.
 

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Dunno bout now...but when I bought a M/cylinder for the CX500 (in ?2012 from memory) from DSS UK the aftermarket part was made in Japan....maybe thats part of the reason for the price differential.
Fitted in 2012 with HEL braided lines....still fine.
Only drawback is if you break a lever....no replacements available (from DSS anyway)....
 
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