1982 Yamaha XJ750J Master Cylinder Desperately Needed

I am very desperately seeking a Master Cylinder for a 1982 Yamaha XJ750J, and can anyone tell me which other Yamaha bikes have the same cylinder, e.g. if the Seca has the same as the Maxim or not.

Thanks guys,
Eric

 

I've been through this myself. I don't think any other XJ uses the same butt-headed behind the headlight master cylinder as the 750 Seca. Is yours damaged? I got a rebuild kit from the local Yamaha shop for about $50. If you have no damage, why not rebuild?

Greg

 

Well, it leaks, and the screw head is stripped, and my autoshop's impact drive was stolen, and I'm still pretty n00bish, so I just wanna try to get a Maxim master cylinder to replace it, which I'm sure as you know, isn't as easy as it should be. lol

 

The rebuild kit would probably fix the leak. I had the same problem with the stripped cap. You can just get a bolt of the same size and thread pitch. Works fine.

Is there a model Maxim that has the same master cylinder? Or are you going to attempt to mount a handlebar style model? I looked at that and decided it would be way too much work.

Greg

 

Having the Master Cylinder Cover screws become stripped on that model Master Cylinder is pretty common.

There's enough material in the cast body to support drilling it out to the next sized fastener if necessary.
Be careful if you have to enlarge the hole on the cover. Keep it center and don't llet the cover fly-away.

 

Perhaps I misunderstood the problem. On mine, the hex hole in the cap stripped out, not the cap itself. In fact, it happened on two of them.

If the cap itself is stripped that's a different issue. I agree that you would have to be very careful enlarging that.

 

Okay, let me put it this way, I'm a 17 year old, Junior in High School, autoshop student. Not to mention, I work on cars, this is the first motorcycle I've ever worked on. I don't know what most of the stuff you guys are talking about is, so I will take a picture of it as soon as I can, and post it on here, so you guys can tell me what the hell I'm looking at, and what to do from there. The master cylinder is one of the handle bar ones, and I already have it removed. My teacher thinks it just needs a new seal, but it's getting the damn thing open that's screwing me over. I have a 1982 Yamaha 750 Maxim, how much would a new master cylinder for that cost? If it's within the right price range, I'd rather just get a whole new one, because this bike has been sitting in an old musty garage for many many years, and I'm fixing it up from there.

Thanks guys,
Eric

 

You are going to get an education if you think there's stockpiles of new ones.
You'll be able to negotiate a Mortgage for a new one; but you'll need two co-signers.

Rebuild the one you have.

Remove dust cover from cylinder end.
Pry it out.
New one comes with Kit.
Circlip holds it all in the Cylinder.
Remove circlip.
Remove pistons seals and springs
Clean
Inspect bore.
Bore OK -- Clean; install Kit.
Bore pitted?
Remove pits from piston travel area.

Put that baby back together!

You just saved a fortune.

 

Don't sell yourself too short. I never took autoshop and until two years ago at the ripe old age of 35, I never put a wrench to a motorcycle. Never had any kind of training other than trial and error. I suspect you're more capable at this than you might suspect.

Greg

 

If you are bent on getting a new or "new to you" unit anyway - what could it hurt to try to rebuild it? If you get the master cylinder off and the cap removed- then order the rebuild kit and have at it. If you destroy it in the process then resort back to plan A.

 

Okay, I'll give it a shot, first I have to drill out the stripped screw and tap a new thread in there, after I do that, I'll get the rebuild kit, but where do I get one, and how much do they cost?

Also, what on earth is RickCoMatic talking about with negotiations, mortgages, and co-signers? What does that have to do with anything?

 

It has to do with the "Sticker Shock" that comes along with being at the Yamaha Dealership's Parts Counter and hearing how much a new part costs.

You plan on getting your big jolt, right out-of-the-way, by hearing how much a Brand New Master Cylinder Costs.

 

Oh okay, I get that, but that's why I posted on here, I was hoping that there might be someone parting out a bike or something, when I first joined this forum earlier this year, people were parting bikes like crazy, now, not so much.

 

I just bought a rebuild kit from the local Yamaha dealer. It was about $50.

Greg

 

If you need a brake hone, I've got one. I'd be happy to help you rebuild yours if you like "neighbor".