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DannoXYZ · November 14th, 2021, 09:25 PM

were talking about TWO different things now right?

1. clogged tank-vent causing vacuum in tank. This is not binary all-or-nothing issue. It's possible to have partially clogged vent, which still vents enough for adequate petrol flow. Mine hissed and squealed for years before I fixed it, but was always able to start and run bike normally regardless. One simple and easy test is riding with cap open. OP reports this made no difference. OP also has not reported any hissing or whining from tank. So we can assume tank-venting is not issue in this case.

2. Leaky petcock seal should only affect operations when bike is off. Such as causing dripping through carbs with non-sealing float-valves resulting in hydrolocked engine and/or stripped starter ring-gear. Neither has been reported by OP. Leaky petcock should not affect opened
operation when bike is ON in anyway because diaphragm will be open for full flow anyway.

Which is our final diagnostic test. If his petcock flow-rate is measured to be sufficient, only conclusion left is dirty and clogged carbs.

November 14th, 2021, 09:25 PM	#39
DannoXYZ ninjette.org certified postwhore Name: AKA JacRyann Location: Mesa, AZ Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot. MOTY - 2018, MOTM - Nov '17	were talking about TWO different things now right? 1. clogged tank-vent causing vacuum in tank. This is not binary all-or-nothing issue. It's possible to have partially clogged vent, which still vents enough for adequate petrol flow. Mine hissed and squealed for years before I fixed it, but was always able to start and run bike normally regardless. One simple and easy test is riding with cap open. OP reports this made no difference. OP also has not reported any hissing or whining from tank. So we can assume tank-venting is not issue in this case. 2. Leaky petcock seal should only affect operations when bike is off. Such as causing dripping through carbs with non-sealing float-valves resulting in hydrolocked engine and/or stripped starter ring-gear. Neither has been reported by OP. Leaky petcock should not affect opened operation when bike is ON in anyway because diaphragm will be open for full flow anyway. Which is our final diagnostic test. If his petcock flow-rate is measured to be sufficient, only conclusion left is dirty and clogged carbs.