Oh Rings!

Hi all:

I've been having intermittant high idle on my 83 GPz750. It seems to be a vacuum leak that I can't find. I've already installed carb kits, replaced a bad float, checked carb holders, replaced carb boots, cleaned bowls/carbs/needles/ports/jets, set float level, replaced plugs, hoses sparkplugs, plug caps, plug wires, replaced a bad coil, checked valve clearances, I've even stood on my head and barked like a dog.

So, my question is: What is the size of the little o-rings on the mixture screws ('cuz they're only thing I haven't changed yet)?

83 GPz750(ZX750A), Yosi 4/1, jetted, and factory airbox

TIA

Have you removed the air-suction-system yet? That contraption has vacuum hoses plumbed to the manifolds (I'm not sure on the 83 750). The diaphragm sometimes leaks.

Doesn't have a air suction system because its' a Canadian model.

Found that the o-ring for #1 was cracked, #2 was worn flat on the outside, #3 looked ok but were smaller than the new o-rings. Replaced the works with new from the local dealer, problem solved.