I looked at USA parts diagrams for both a ‘98 Zx6E (Zx600E) and a Zx6R (Zx600G) and neither have a fuel regulator. There is a fuel shut-off valve (petcock), a fuel filter and a fuel pump. No other components between the fuel tank and carbs.
Fuel pumps for carbed bikes should only be pushing 2-3, maybe 4, psi. The fuel needle valves should be able to shut the fuel off and dead-head the system if they’re working properly.
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