Round Master Cylinder Reservoir

[tvrla]

I've got an early right side control I'm working on and the reservoir is a little scratched up. I'd like to clean it up and polish it, which would be easier separated from the mastercylinder.

However, it appears it comes assembled from the factory and not sold separately. Is it not possible to remove it? What if it leaks - is there no way to replace the seal?

The threads in the control aren't the best, but will work ok. What have you done to repair them? There's not much room for an insert, but looks possible if done very carefully.

[Red_Hen]

Can you add a picture?
Motobins sells kits for m/c but not sure this is your Q.

[Barry]

I'd like to clean it up and polish it, which would be easier separated from the mastercylinder.

However, it appears it comes assembled from the factory and not sold separately. Is it not possible to remove it? What if it leaks - is there no way to replace the seal?

I'm sure I must have done it when I repainted my master cylinder but that was 4 or 5 years back and the memory is vague. I think there are a couple of small Allen screw to split the assembly. I do remember there is a rubber seal/dust cover on the master cylinder push rod which I didn't have because it wasn't shown on the diagram. There's a circlip to remove the piston assembly.

[tvrla]

This is a used (of course, or I wouldn't be asking) right side control, perch, lever and master cylinder. It got a little scraped on the end of the lever and a few scrapes on the round reservoir and just below that on the MC. The lever is now smoothed and polished, and the paint is almost all off the perch - bubbling in places and needing a refresh badly.

I was very lucky in that the bore of the MC and the seals look perfect! So no rebuild kit is needed.

The round MC isn't like the newer rectangular style which is held in by a small phillips screw from the bottom. There are no visible fasteners and it appears to be held in by tension, possibly from the o-ring.

I tried pulling on it, and twisting, but neither worked. And there's really no way to grab hold of it to apply more force. I could try heating the whole thing up with the heat gun - perhaps the MC will expand enough to allow the reservoir to wiggle out of there.

One other question - and I think this has been kicked around before - what paint works best for these things? I've used epoxy before and it lifted just as badly as regular paint. I seem to recall someone saying the POR15 works well.

[Barry]

I tried pulling on it, and twisting, but neither worked. And there's really no way to grab hold of it to apply more force. I could try heating the whole thing up with the heat gun - perhaps the MC will expand enough to allow the reservoir to wiggle out of there.  

I didn't manage to get the reservoir out either.  I remembered someone here did. You might want to get Lou to elaborate on "pops off" He's making it sound too easy.

http://www.bmwr65.org/cgi-bin/yabb2/YaBB.pl?num=1252015489/0#6

[Bob_Roller]

I don't have a round reservoir master cylinder ('81 model year bike), I may have this wrong, but I was under the impression, that the round plastic reservoir was bonded to the metal body of the master cylinder .

It was not meant to be separated .

[wirewrkr]

I don't have a round reservoir master cylinder ('81 model year bike), I may have this wrong, but I was under the impression, that the round plastic reservoir was bonded to the metal body of the master cylinder .

It was not meant to be separated .

[size=14]Correct![/size][/color]

[tvrla]

I guess Lou's came un-bonded for some reason.

[steve hawkins]

I have fitted a later type rectangular master cylinder to an earlier type twin put throttle assembly.  Only a little fettling required to securing bolt/hole.

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[Red_Hen]

Off subject:  Love your dash and jewel lights!  She looks like a beautiful ride - can we see a complete side view?

[steve hawkins]

I am surprised you have missed it, I have not been shy posting pictures of it here.  But just for you.

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[Milo_357]

I am surprised you have missed it, I have not been shy posting pictures of it here.  But just for you.

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ANY excuse to show of your gorgeous cafe racer, ANY excuse... (grumblejealousygreeneyedmonstergrumblewantonewantone...)
 

Seriously, what are those air filters?  Are they better than the airbox you removed, or is it part of your "where's my hacksaw?" policy?

[steve hawkins]

If high speed performance is your bag - then you would probably do better with the plastic airbox - I removed the alluminium clamshell airbox.  But I have not dyno'd the bike so it is only gut feeling.  On the road at legal speeds and a bit above, I do not notice.  
  
I am running standard jets with those pod filters.  The trick is to get as much surface area on the filters that you can.  I.e. not the little round ones, but the larger oval ones.  The smaller filters will be too restrictive at high speed.  

Note: I am also not running standard mufflers either.

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