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KZ 650 Master Cylinder kaput?
- seanof30306
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While in the process of fighting electrical problems for the past several months, today I noticed the master cylinder is leaking. Yay!
I pulled on the brake lever a few times, and it's mushier than normal. When we replaced the brakes pads, we had a terrible time getting the front brake bled. Even when we got it as good as we could, it still felt mushy.
The bike has dual calipers on the front, and drum on the rear. I'm almost certain it was a single caliper front setup from the factory. I noticed today that JCCWall's 81 H1, which has dual front brakes, has a bigger mastercylinder than mine does. We're pretty sure a previous owner swapped over to KZ750 forks, brakes, etc.
It got me to thinking, do the dual caliper setups have a bigger master cylinder? If so, and my bike still has the single caliper master cylinder, coyld that be what is causing the mushiness?
If this is the correct master cylinder, am I better off replacing the master cylinder, or rebuilding it? My buddy said his was leaking, so he just put some Trans-X in it. He said it quit leaking.
I'm a little suspicious.
"That @#$%!!! KZ650"
79 KZ650 B3
Dual front disc brakes
Z1R 18" front wheel
Pumper carbs w/pods
MAC 4-1 w/ drilled-out baffle
Dyna S ignition w/ Dyna Green coils
WG coil mod
'81 CSR charging system
17/41 gearing
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- Zthou1977
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1977 Z1000A1, 1982-1986 KZ1000P (built from two piles of parts), Moto Martin Z1200 (trying to get it registered), 1977 Z650B1
Utrecht, The Netherlands
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- civilengr3
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My bike had the smaller m/c installed w/ duals; I put the bigger one on it. If I were you, I'd replace it. It may work fine for most stops, but when you really need it, it may not perform for you. 100 bucks is a small price to pay for the comfort/safety level. But the bleeding part is so hideous:S
1977 KZ650C
East TN
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- seanof30306
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"That @#$%!!! KZ650"
79 KZ650 B3
Dual front disc brakes
Z1R 18" front wheel
Pumper carbs w/pods
MAC 4-1 w/ drilled-out baffle
Dyna S ignition w/ Dyna Green coils
WG coil mod
'81 CSR charging system
17/41 gearing
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- SPARKY47
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- 1980 KZ500 B2
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1980 KZ500 B2
Location: Middle England[/b
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- Patton
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'79 KZ650 B3... master cylinder is leaking... dual calipers on the front...single caliper front setup from the factory...pretty sure a previous owner swapped over to KZ750 forks, brakes, etc....
A used m/c from eBay or anywhere else may be in worse condition than already have. Would consider rebuilding present unit. Must dissassemble to clean and inspect bore. Minor pitting inside bore is not a big deal and may be lessened by polishing. Kits include new piston and cups.
Need to determine type m/c (barrel, trapezoidal, etc.) and size of bore, which is as already mentioned usually embossed on the underside (usually either 14mm for single disk or 5/8" for dual disks).
Different type m/c involve various disassembly techniques.
Could a photo of the current m/c be posted???
Good Luck!
1973 Z1
KZ900 LTD
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- seanof30306
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cgi.ebay.com/ebaymotors/FRONT-BRAKE-MAST...9QQitemZ120306022529
"That @#$%!!! KZ650"
79 KZ650 B3
Dual front disc brakes
Z1R 18" front wheel
Pumper carbs w/pods
MAC 4-1 w/ drilled-out baffle
Dyna S ignition w/ Dyna Green coils
WG coil mod
'81 CSR charging system
17/41 gearing
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- seanof30306
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seanof30306 wrote:
'79 KZ650 B3... master cylinder is leaking... dual calipers on the front...single caliper front setup from the factory...pretty sure a previous owner swapped over to KZ750 forks, brakes, etc....
A used m/c from eBay or anywhere else may be in worse condition than already have. Would consider rebuilding present unit. Must dissassemble to clean and inspect bore. Minor pitting inside bore is not a big deal and may be lessened by polishing. Kits include new piston and cups.
Need to determine type m/c (barrel, trapezoidal, etc.) and size of bore, which is as already mentioned usually embossed on the underside (usually either 14mm for single disk or 5/8" for dual disks).
Different type m/c involve various disassembly techniques.
Could a photo of the current m/c be posted???
Good Luck!
My digital camera is dead, but this is the exact same one
"That @#$%!!! KZ650"
79 KZ650 B3
Dual front disc brakes
Z1R 18" front wheel
Pumper carbs w/pods
MAC 4-1 w/ drilled-out baffle
Dyna S ignition w/ Dyna Green coils
WG coil mod
'81 CSR charging system
17/41 gearing
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- seanof30306
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seanof30306 wrote:
'79 KZ650 B3... master cylinder is leaking... dual calipers on the front...single caliper front setup from the factory...pretty sure a previous owner swapped over to KZ750 forks, brakes, etc....
A used m/c from eBay or anywhere else may be in worse condition than already have. Would consider rebuilding present unit. Must dissassemble to clean and inspect bore. Minor pitting inside bore is not a big deal and may be lessened by polishing. Kits include new piston and cups.
Need to determine type m/c (barrel, trapezoidal, etc.) and size of bore, which is as already mentioned usually embossed on the underside (usually either 14mm for single disk or 5/8" for dual disks).
Different type m/c involve various disassembly techniques.
Could a photo of the current m/c be posted???
Good Luck!
My digital camera is dead, but this is the exact same one
www.cgi.ebay.com/ebaymotors/KAWASKI-79-K...6QQitemZ260278226548
"That @#$%!!! KZ650"
79 KZ650 B3
Dual front disc brakes
Z1R 18" front wheel
Pumper carbs w/pods
MAC 4-1 w/ drilled-out baffle
Dyna S ignition w/ Dyna Green coils
WG coil mod
'81 CSR charging system
17/41 gearing
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- Patton
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For example, different style m/c with same bore may have different piston design. Am guessing a barrel 5/8" would likely use a different piston than a trapezoidal 5/8".
Good Luck!
1973 Z1
KZ900 LTD
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- seanof30306
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cgi.ebay.com/ebaymotors/KAWASKI-79-KZ650-KZ-650-BRAKE-MASTER-CYLINDER-FRONT_W0QQcmdZViewItemQQ_trksidZp3286Q2em20Q2el1116QQitemZ260278226548
edit: ok, no link, but there is the address of the 14mm trapezoidal m/c that is off a '79 KZ650, same model as mine.
cgi.ebay.com/ebaymotors/FRONT-BRAKE-MASTER-CYLINDER-KZ200-KZ550-KZ650-KZ700_W0QQcmdZViewItemQQ_trkparmsZ72Q3a570Q7c39Q3a1Q7c66Q3a2Q7c65Q3a12Q7c240Q3a1318QQ_trksidZp3286Q2ec0Q2em14QQhashZitem120306022529QQitemZ120306022529
and here is the address of the new one on ebay. you just have to put:
http://
in front of them
"That @#$%!!! KZ650"
79 KZ650 B3
Dual front disc brakes
Z1R 18" front wheel
Pumper carbs w/pods
MAC 4-1 w/ drilled-out baffle
Dyna S ignition w/ Dyna Green coils
WG coil mod
'81 CSR charging system
17/41 gearing
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- civilengr3
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1977 KZ650C
East TN
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