Quote:
Originally Posted by Triple Jim
You don't need a vacuum gun, a gentle sucking with your mouth on the vacuum hose should open the petcock. They're made to stay open even when you open the throttle and there isn't much vacuum.
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i wouldn't do that if he's finding gas in petcock's vacuum line.
hand-operated vacuum pump will help troubleshoot leaking diaphragm. Pump it up to 5-7 in.Hg to get fuel flowing. Then watch gauge. If vacuum drops and you have to keep pumping to maintain same vacuum reading, shows diaphragm isn't sealing.
here's procedure for R&R
https://faq.ninja250.org/wiki/Rebuil...tcock/fuel_tap