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Petcock rebuilding issue

Josh..with over just 200 miles and sitting on top of the hot engine for a few hrs..coupled with the 80 degree Texas sun and not a drop...I think its gonna be ok,,,for how long is of course anyones guess.
 
chuck hahn said:
Josh..with over just 200 miles and sitting on top of the hot engine for a few hrs..coupled with the 80 degree Texas sun and not a drop...I think its gonna be ok,,,for how long is of course anyones guess.
Click to expand...

Ha, Chuck, thought you were talking to me. Until I remembered that TheCafeKid is a Josh, too. :)

Out of curiosity - do you know the dims of the o-ring that worked?
 
rustybronco said:
To make the dowel round, chuck it up in a drill motor and sand the angle with a piece of sand paper attached to a flat piece of wood, or if it will fit in a pencil sharpener, that might work as well.

Another thing that might help matters is the size of the o-ring used to seal off the seat. I think the one that comes on the diaphragm in those aftermarket kits might be a wee bit too small. The one I used to replace my old one was a little larger than stock. I used it because it was all that I had on hand, but it sealed perfectly.
Click to expand...

Cool deal, thanks, RustyBronco! I picked up some lapping compound and a 3/8" hardwood dowel. I think the pencil sharpener (which did fit the 3/8" dowel) was a good way to get started, but I'm fairly certain the angle is too shallow compared to the seat. But the drill is a great thought to finish it up and keep it round, thanks!

Meanwhile - same question for you as I asked Chuck: Do you happen to know the size of the o-ring that worked for you? No guarantee that'll be the right size for mine, I guess, but it's a starting point to try.
 
chuck hahn said:
Nope...not gonna take it apart.
Click to expand...

Of course not. I was just crossing my fingers that you knew what it was when it went in. :)

Edit: Because when I'm trying to solve a gas leak with a part that doesn't work right I always take measurements as I go. ;)
 
Amazing how the most simple device on a bike can cause so much frustration. Why is it they can't design a decent fuel petcock? I have 4 (2 factory, 2 aftermarket) in my parts box along with a couple rebuild kits that didn't work long.
 
Hey guys I want to let you know my experience with the petcock kit.

I cleaned everything and looked at the o-ring seat. It looked fine to me but when I put the kit in it leaked.

I tried the spring extension trick but no good. I then tried lapping the seat. That just made it worse.

That condition told me the seat was lower than the lowest point the o-ring would reach, thus no seal. Since I had nothing to loose I decided to take a risk.

I decided to sand down the diaphram spacer, I took a few thousands off the "o-ring" side of it and put it back together. Works perfect, the only thing I suggest is that when you sand that side down you remove the raised spots on the spacer that I assume work as sealing edges. So use a bit of gasket maker on the very edges of the rubber to metal seal area and you will not have any problems.

Just wanted to pass this on in case it helps someone else.
 
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