Suzuki 2 Strokes

Having issues with the fuel not shutting off on my early modell GT550 . This is the petcock w/ 3 outlets. Seems like the O ring on the vacuum diaphram has perished. Cleaned up where the ring seats but fuel still dribbles out without any vacuum being applied. Has anyone had any luck replacing that o ring? Failing that, has anyone replaced the entire petcock with something from another bike/brand? What about a way of turning the petcock into a manually activated piece. What size is the o ring on the diaphram? What to use to divide one outlet into 3? Not worried about originality sine the bike is somewhat of a mongrel already. Thanks

That o-ring is a bastard size, not likely to be found in your local hardware store.
HVCCycle has a rebuild kit for your early petcock The o-ring is included in the kit. Link below

http://www.hvccycle.net/early-model-suz ... epair-kit/" onclick="window.open(this.href);return false;" onclick="window.open(this.href);return false;" onclick="window.open(this.href);return false;

Another thing to do when rebuilding is carefully inspect the tapered seat where the o-ring seals off the fuel for any corrosion or pitting. If either is present, roughly shape a pencil eraser to the taper. Apply some compound to the eraser, insert and spin back and forth between the palms of you hands - polishing the seat. Rinse well as you don't want any compound in your motor.