It 8mm IIRC , you can put a clear fuel hose on the drain screw nipple and hold the other end up along side the carb going above the carb some. When you open the drain screw the fuel will fill the tube up to the level in the bowl . It should be 8mm(5/16" or .313") below the parting line of the bowl and carb body . So you won't have to take the carbs out of the bike to check.
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'86 XT600/3TB motor,,, '88 XT600, ,,'92 XT600e,,, '08 Husky TE510,,, '05 DRZ463,,, '95 KLX650 ,,,'96 KLX650
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