Nasty front master cylinder

More
16 Sep 2006 12:36 #77206 by EsaPro
Nasty front master cylinder was created by EsaPro
I finally got the cover off my KZ750 front master cylinder, and now I kinda wish I hadn't. Is this thing salvageable? Besides the sludge, I cannot get the bottom right screw out, even with an extractor. I have not even tried the top right one yet (Both broke off when I used a screwdriver on 'em). Funny thing is, the front brakes work!! :ohmy:

Jim
79 KZ750 Twin (Fun!)
07 Yamaha 1300 (Plush!)
Attachments:

Please Log in or Create an account to join the conversation.

More
16 Sep 2006 12:40 #77209 by OKC_Kent
Replied by OKC_Kent on topic Nasty front master cylinder
Mine was kinda nasty, I used brake fluid and a brush to clean it up. You have nothing to lose, and if it gets destroyed there are plenty on ebay to replace it. You can buy some new ones, I saw some for $80 that would handle a single disc.

Oklahoma City, OK
78 KZ650 B2 82,000+ miles

Please Log in or Create an account to join the conversation.

More
16 Sep 2006 12:50 #77212 by EsaPro
Replied by EsaPro on topic Nasty front master cylinder
Yea, my metal state is about there - go for it. But I am kinda stumped on how to get these screws out. The extractors are just tearing them up, and they are NOT coming out of the threads.

Jim
79 KZ750 Twin (Fun!)
07 Yamaha 1300 (Plush!)

Please Log in or Create an account to join the conversation.

More
16 Sep 2006 12:53 #77213 by Sandy
Replied by Sandy on topic Nasty front master cylinder
OKC_Kent wrote:

Mine was kinda nasty, I used brake fluid and a brush to clean it up. You have nothing to lose, and if it gets destroyed there are plenty on ebay to replace it. You can buy some new ones, I saw some for $80 that would handle a single disc.


Exactly what Kent said...giver a go...but just remember...a rebuild kit($)...the struggles of getting the broken screws out...the time involved in a rebuild,etc.
It would be great if it all worked in Your favour,BUT...again...like Kent said...You might want to concider another one from ebay.:whistle:

What are You using for an "Extractor?",btw.
I ask this,because I don't see any holes drilled in the screw...
(or am I just blind?,lol)

Work on getting those screws out,and give it a good cleaning(plus a complete system flush)...pick away at it,and let Us know how it goes...

1977 KZ1000 A-1

Please Log in or Create an account to join the conversation.

More
16 Sep 2006 13:19 #77222 by steell
Replied by steell on topic Nasty front master cylinder
I don't think rebuild kits are available for that model, at least I have never been able to find one. That is a 78-79 KZ750B master cylinder, and is also used on a couple of years of 1000's (77-78 I think).

If you can get the two screws out of the bottom of the resevoir and get it off, I have a spare you can have.

Post edited by: steell, at: 2006/09/16 16:21

KD9JUR

Please Log in or Create an account to join the conversation.

More
16 Sep 2006 13:26 #77225 by fixer5000
Replied by fixer5000 on topic Nasty front master cylinder
get yourself a stubby phillips driver of the correct size. hold it and the master in your hand and give the screws a few good whacks straight on. im talking good whacks here and no harpooning your hand. now try to loosen the screws. this worked for me and mine looked as bad if not worse then yours. i wouldnt use a vice unless you got something soft to hold it right with....good luck...steve

1978 kz650b pretty much stock
\\\\\\\" get there fast but arrive alive \\\\\\\"
massachusetts

Please Log in or Create an account to join the conversation.

More
16 Sep 2006 13:31 #77229 by pumps
Replied by pumps on topic Nasty front master cylinder
For that I would use my Craftsman " Screw Out" set. Its always worked so far. Does look like a toughy though.

Check out our site. kcvjmc.org
1977 Yamaha XS650
2000 Kaw W650
2 KZ440 LTDs , a 79 KZ400H and an 83 Belt Drive

Please Log in or Create an account to join the conversation.

More
16 Sep 2006 17:22 #77291 by EsaPro
Replied by EsaPro on topic Nasty front master cylinder
Sandy - The bottom right was an extraction attempt - a 6MM Craftsman - the type with the bit on one end, and the extractor on the other. I may need to drill down a bit more. My first attempt got the head broken off, but not the shaft of the screw. :(

Steell - Thanks! I have the top, but two screws stuck (I am thinking two might be enough to hold it down anyhow?).

I have the thing off the bike now on my workbench. Now, I am not what one would call a mechanic of any sorts ('cept computer), but I don't think brake fluid is supposed to be the color and consistency of melted Hershey bar, right? This poor baby has had no love in a looong time. The shaft is rought, but the piston edges and cylinder itself look remarkably good, considering.

The two screws at the bottom of the cylinder are indeed stuck tight. I am soaking it in brake fluid now, we shall see in the morning.

I see a master cylinder on ebay now, for a couple weeks. $50. That may have to be mine tonight. ;) Alternatively, can anyone point me to an aftermarket (new) one that will work on a 79 KZ750? I am getting to the point of ready to pay some bucks. I need to get it through VA inspection!

Thanks again to all - you guys will get me rolling on this baby yet!

Jim
79 KZ750 Twin (Fun!)
07 Yamaha 1300 (Plush!)

Please Log in or Create an account to join the conversation.

More
16 Sep 2006 20:13 #77320 by Sandy
Replied by Sandy on topic Nasty front master cylinder
Jim,as far as getting a non-stock master on Your bike?...they all pretty much use a standard 10mm fitting(at the banjos).
As a matter of fact,the one on My KZ is off of a 1996 Honda,CB650,and it bolted right on(had to mod for the mirror on that side).It came complete with the adjustable style lever,so You can set it up to fit Your finger reach,etc.
So as long as You can get one that will still allow You to use Your mirror(if that's even an issue) then I would say that You could get one off of almost any bike,and make it work on Yours.
I can post a pic if need be,just to give You an idea...

B)

1977 KZ1000 A-1

Please Log in or Create an account to join the conversation.

More
16 Sep 2006 20:57 #77327 by neilage66
Replied by neilage66 on topic Nasty front master cylinder
If you don't wanna do the clean up, check out eBay seller: usa-motorcycles-inc

I recently bought a new front master from them for a single disc set up including reservoir,cap, gasket, lever, brake switch, mirror hole, banjo bolt and crush washers...in other words the complete assembly. They sell em for 29.99 + 15.00 shipping from Miami. The assembly is "decent" quality, but turns out it's made in China...go figure. For the price, I was pleased, it's new and it works well. Just hope it lasts 25 years like my original! :P

ps: I am not affiliated with this seller, only a one time customer so far. ;) And...there are also a ton-o-used ones on the auction block that look pretty good. Maybe you can find a better deal than new.

Post edited by: neilage66, at: 2006/09/17 00:05

Please Log in or Create an account to join the conversation.

More
17 Sep 2006 06:38 #77378 by N0NB
Replied by N0NB on topic Nasty front master cylinder
I've had two that were that filthy and I just used a toothbrush under a running faucet to scrub them out.

I would advise against taking it apart as I was never able to find an exact fit for the O-ring under the white reservior and the MC body and it's not available seperately. I got one that was close and it seeped for a while.

As for those screws, heat is out of the question. PB Blaster might help, but they're probably frozen due to electrolosis between the dissimilar metals--effectively welded.

- Nate >>

Nate

Nates vintage bike axiom: Riding is the reward for time spent wrenching.
Murphys corollary: Wrenching is the result of time spent riding.

1979 KZ650 (Complete!)
1979 KZ650 SR (Sold!)
1979 KL250 (For sale)
1994 Bayou 400 (four wheel peel :D )

Please Log in or Create an account to join the conversation.

  • wireman
  • Visitor
17 Sep 2006 10:06 #77411 by wireman
Replied by wireman on topic Nasty front master cylinder
yeah that is the same 1/2" mastercylinder they used on 78 kz1000s.i was wondering if it would be possible to have one bored from 1/2" to 5/8" and using 5/8" rebuild kit in it.if you are really ambitious and want to get those screws out if you can drill a pilot hole down through the screw you might be able to use the square pointed end of a real small chainsaw file as an easy out,dont laugh ive used this trick before!:P

Please Log in or Create an account to join the conversation.

Powered by Kunena Forum