1977 GS Petcock repair kit

[Guest]

Hi people,
Well today I successfully rebuilt my petcock using a kit,not without some dramas. After doing some research I found Matchless's tiutoral on bike cliff and this youtube vid
https://www.youtube.com/watch?v=bwpwhXXF9EQ very helpfull so thanks fella's. Now the problem I struck after the rebuild is that it still leaked fuel on res and on, so after studying the heck out of it and putting it together and taking it apart about 10 times I concluded that it had to be the o-ring on the diaphram piston. So I went to my local auto part store and got a slightly fatter one $2. Low and behold it worked. Now the one in the kit was brand new so I don't know why it didn't work, I used the oem part number when I bought it. Needless to say I was absolutly stoked when it worked. So I hope this can help someone before the bail out on there new repair kit.
G:get S:some
sorry about the pic being upside down

[chuck hahn]

The rebuild kits do indeed have an inferior oring with them. maybe tell us what size oring you got to work and we can just swap orings in existing petcocks from now on instead of buying kits!!! Whats the durometer? ID and OD???

[tkent02]

Chuck, I took a disassembled petcock in to the local O Ring Emporium and they were easily able to pick one that worked. Viton for gas, hardness is not really all that critical I don't think. Sorry I don't remember the size.

Works fine, lasts a long time.

[Catcalledsprocket]

Hey Chuck,
Sorry mate I didn't take note of the size or if it was able to handle fuel or not,what a bozo! I just took the old one in and sized it up by eye. However I'm going back to that store today if I get time so I'll ask them what size it was and what it's made of. I did need the kit, although the diaphram was fine it was leaking just slightly from the face plate so I needed that rubber washer with the 5 holes in it and the 0-ring for the tap handle.