Join Date: Nov 2009
Location: Lander, Wyoming
Grinnin and klr4evr,
The 'o'-ring you are referring to is a California emissions part.
It is actually kind of a 'little' upside-down, hollow, mushroom.
You must un-bolt the fuel cap to properly install it.
K part#, 92093-1030, $5.73 USD.
Normk, sort of made some recently, out of small fuel line.
Might be seen or discussed in 'Simple, Cheap and Easy', either on this forum or over on klr.net.
Someone here, Stomped on Normk's toes. He's a little 'miffed'!
Modify at "YOUR OWN RISK"!
Still riding my 1987 KL650-A1. 84,000+ miles & counting