When the first KZ1300's arrived, almost all of them came out of the crate with flat front tires, which were some of the first tubeless tires on production bikes. We figured out right off, by submerging the wheels in vats of water, after numerous attempts to fix the leaking valve stems, that it was the tires NOT sealing against the beads.
From then on, and on all my tubeless street tires even today, including my own KZ1300, all the beads are silicone sealed to the wheel beads, no matter the tire used.
Also, we had leakage issues on the first Morris Mags, the magnesium racing ones, not the street aluminum wheels. The magnesium was so porous, the tires could go flat in less than a full test session. Eliot Morris came up with a good fix, a special green colored epoxy that was applied to the rim area, sealing the porosity. We also had a few RG500 racer and Yamaha TZ race only engine castings that had porosity issues. I lived in Merced back then,,and found a company on the Bayshore Freeway in San Leandro that used to impregnate resins into the porosities of aftermarket Jet Ski intake manifolds by heating, then vacuum filling those voids. Never had leaks after that, and I did have a few cast wheels done as well. funny about that place, the company had an advertising sign that faced the freeway, and many were perplexed when they read it, not having any idea as to why, let alone what "STOP CASTING POROSITY" really meant. 'Casting Aspersions', yes, 'Casting POROSITY', WHAT, HUH, ER, DUHHHHH???
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Tire shops often have a can of bead sealer on hand for cases like this.