I get about 2.0-hrs of full-thottle track time out of 3.5-gallons of fuel in tank. You can figure out drain-rate from tank with those numbers. I bet your petcock is flowing more than that by significant amount.
Quote:
Originally Posted by jkv45
My guess is either carb/jets are not completely clean or the diaphragms are damaged.
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Yup, most likely fuel flow inside the carbs is problem (clogs or damage). I'll dig up photos of secret passages and disassembly photos when I get to a desktop.
Carbs aren't completely clean. Search here and you'll find that even experienced DIY guys who rebuilds engines on their kitchen tables with both arms tied behind their back, have had to tear their carbs apart 4 times before they got them clean enough.
EDIT: check out this thread for photos of where to clean
https://www.ninjette.org/forums/showthread.php?t=317977
Most likely if you didn’t do following, carbs really aren’t as clean as factory new condition:
- soak in heavy-duty industrial chemicals (not spray carb-cleaner)
- hot ultrasonic bath
- flossed all hidden passages with wire/string
- soda blasted all orifices and circuits