Rear Master.... Again

[Toolmaker Tim]

Got my rebuild kit for the rear master and am ready to actually have rear brakes, however...... I didn't wait to tear the thing apart and now have brain lock on how it all goes back together Are there any pictures out here on Chan.11 on how everything goes together? What I need is a picture of an assembled piston shaft. Thanks in advance.

[DGXSER]

You will have to search for a pictorial assy, not aware of an official tech tip or one posted recently.

I would bet if you post pics of the parts more than a few will know what order they go in, I would probably recall it once I see the parts, it just has been a long time since I had one apart.

[dbeardslee]

Maybe this will help...

[natemoen]

I just did my rear master cylinder and if you need help I remember which parts go where but it might be hard to explain it in words. If you need it I can try to help thought!

[Toolmaker Tim]

Master Cylinder Amnesia

Thanks guys for the help. The schematic on Bike Bandit helps, but since I'm blind in one eye and can't see out of the other Really, I have seen that schematic and thanks for posting it, but I can't tell from it which way the seals face, and where the thin shim-like washer goes. My SWAG is that the bottom seal faces up, the top seal faces down, the thin washer goes on top, and the top hat thingy has the small end up so the spring sets on it. My biggest guess is the thin washer is for keeping the top seal in place, closely followed by which direction the seals face.

[SFerinTEXAS]

All of the cups face away from the plunger rod.

[Toolmaker Tim]

Doug, while I'm thinking about it, thanks for your PM on the carbs. I see you have the next size up on the jets. What are your needles set at? I'm going to give your float height setting a try as a starting point. I've been busy sorting out this brake thing, getting my wheels back on the bike and fixing a stripped out pinch bolt on my rear axel. fortunately it was only the bolt that stripped and I was able to run an 8mm tap through and get the spun off part out.

[Toolmaker Tim]

Cups

Ok, I am pretty sur you are telling me that the open side is facing up toward the top of the MC.

[SFerinTEXAS]

Yes. They only push out.

[Toolmaker Tim]

Thanks

Well I'm hoping to make some forward progress tomorrow (today) on that part of the bike. I'm assuming I was correct on where the thin washer goes?

[SFerinTEXAS]

I could be wrong but I dont think a washer goes on the inside. I know there is one outside that goes before the snap ring on the outside. but I could be wrong. If you want I will pull one apart and confirm. Need to do it anyway just in no hurry.

[Toolmaker Tim]

The washer you are thinking of has a slot in the middle and holds the piston up against the spring pressure. I think this one goes between the cup and the little hat thingy the spring rides on. As for taking your MC apart just to see if there is a washer there...... please don't just for me. I apprecate the offer, but as another member here says, when you open a can of worms it takes a bigger can to fit them back into.

[SFerinTEXAS]

I was not gonna pull mine apart. I have a small stash. If you can wait till a day or so no problem.Need to clean one up for later.

[natemoen]

The small think washer goes on the top of the plunger underneath the seal. and then the "little hat thing" goes on top of the seal like you said. also like what was said before all the seal face up.

[dbeardslee]

Doug, while I'm thinking about it, thanks for your PM on the carbs. I see you have the next size up on the jets. What are your needles set at?

Mine are on the center notch, but to tell you the truth, I don't remember if their the stock needles, or the ones that came in a carb kit. The ones that come in a kit usually have a slightly different profile. The stock needles have a gradual taper and a very sharp point. The ones that come in the kits I've seen tend to be two stage needles. When I first put the 'kit' needles in it was running great, then I had a couple mikes black coils that crapped out and decided to act like a carb problem. I had the carbs off 15 times (no lie) trying to fix the problem, and during the process IIRC I changed the needles back to the stock ones. Needless to say, that didn't fix the coils . I replaced the coils, and the problem was solved. After taking the carbs off that many times it was getting pretty old, so I think I left the old one's in place. Now you've got me curious, and I've got a funny feeling number 16 isn't far off .