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Discussion in 'Old's Cool' started by walkingbear, May 1, 2010.
89 R100GS tech question
Never rebuilt a set of petcocks before. What do I need?
Rebuild kits and some carb cleaner? If they're anything like the spring loaded, screw on petcocks on my /5 you'll also need a beer or two and something to huck across the garage..
Brilliant Just rebuilt a pair on my /7 so I know what you mean.
On the later airheads, they are either Germa or Karcoma and are rebuildable. Hucky, for example, sells rebuild parts.
Use silicone grease to lubricate everything.
The older petcocks (the Everbest on the /5's) not easily rebuildable and should be done only if you need the "correct part" for a restoration.
Yes, forgot to menton that mine were of the Karcoma variety.
I just did a set from my /7 ... If you have a 15mm bicycle wrench .. the kind that's made by a stamped out piece of sheet metal ... Like this:
You can use the pointed ends of the wrench to open the petcock ... really easy.
The rebuild kit contains three gaskets. The first is a circle with three holes in it. The next is an o-ring. These two are must's to be replaced and are both interior to the petcock. The third is a cork seal that seals the seal in between the petcock and the tank ... this one is difficult and I wound up making one that worked infinitely better out of an 1/8" rubber sheet (from a DIY gasket kit).
The first petcock took me ~15 minutes to do. The second one took me 2. Easy and no more leaks!!!
Wouldn't bother with the fiber gasket between the petcock and tank. Later models use a mesh strainer screen with a built-in aluminum washer that fits over the inlet straws of the petcock in the tanks. Good addition.
16 12 2 307 112 strainer petcock 1970 on $ 6.75
I've saved the petcocks every time I'v broken up a bike or sold a tank, so I have a bagful of em.
A couple of weeks ago, I was caught up on the R-90 and looking for something to do, so I began disassembling, cleaning and rebuilding petcocks. A day soaking in Pinesol got em pretty clean and a tiny burr on a Dremel tool got at the oxidized crud down below the tubes. After that, it was just a matter of taking each one apart, checking the condition of the parts and then reassembling them.
Now, after an evenings work, I have a lifetimes worth of good petcocks! and only a few things got thrown across the room!
I'm rebuilding my Karcoma taps, with parts from Hucky, so I lube just the the rubber bits and not the felt washer, correct?
Can I use a silicone spray lube or is dielectric grease better?
The spray isn't very thick and dries out quickly. The grease will last much longer. Silicone grease is much cheaper than dialectric - get it at a bearing supply house in a large tube for eight bucks.
Will do. Thanks!
For $41.95 for new, I didn't think it was worth the effort to rebuild mine...
Maybe so but the rebuild "kit" was $10 each and it didn't take me more than 5 minutes apiece. I can find other things to do with the $60...
I've taken them apart many times and not even replaced anything - just cleaned them out, polished up the valve - and put them back together and they've worked fine.
No need to frighten everyone off thinking that new ones are the only way to go.