I keep reading this post. by Kawasaki gods you mean the designers? engineers? the Kawasakis I have/had didn't have overflow tubes,and had vacuum petocks. neither did the Hondas or suzukis, and the one Yamaha.
I'd be willing to bet they didn't use overflow tubes due to liability of bikes catching fire, or garages catching fire.
you know how lawyers think. I'm sure they figured the average amount of claims they'd have to pay out.
the leaky petcock I experienced was only dripping. I didn't do a study on how long it would take to fill a cup, or coffee can. I replaced it with an OEM vacuum petcock. they seem to last a good 10 years.
there wasn't much talk about hydrolock on the GPz board. or overflow tubes. or on the ZRX board either. interesting why its such a
common problem to the ZG1000
ahhh the raveges of youth, the differences between Kehein and Mikuni carbs, going back into time, created and needed certain parameters, which the carb designers made... the bike designers didn't do the carbs... they bought them....and installed them.
wayyyy back in time, because I do not know your age, I will say Mikuni carbs were the major player. they had internal overflow tubes in the float bowls... and almost all of them that I can recall, had steel float needles, sitting on brass inserts, that controlled fuel flow... and they actually worked... oh, at that time, all petcocks were manual...yeah, at times there would be a leaker, but when it leaked, it drained. on the ground.
the beginning of the Kehein CV carbs was exponentially superior, but then, it was an infant at the time... originally, those float needles were polished metal also, but rapidly (first year) changed to a rubber/polymer tip...
stuff happened.
fuel changed, bikes sat in places for years, people got cheap, service got expensive, and all in all, the scenario and outcome rolls downhill to today.
my experience with Mikuni carbs, on all my old bikes, was the intake tract ALWAYS ran uphill... slightly, but still uphill. it was due to the tall tower required to contain the barrel slide, and the throttle cable and adjustments for same... when the Kehein's appeared, they were shorter, and the links were relocated, thus, they lifted the carbs up, and in dead space, under the tank, and aimed the throats downwards... mm mm bad choice, because people tend to pour strange snake oil additives I.e.seafoam, and Berrymans B12, into the gas, and let it sit in carbs... degrading the rubber/polymer tips on the float needles..
I digress, but take my word, there is a history of progression, and also mistakes made by "OEM" suppliers, such as Kehein..
we work around it. we adapt.
gpz and zrx carbs do differ, so looking for the answer there is moot.... besides, both those bikes have a 6 month ife expectancy with the squidies.. so... they never see the 30 year old results...