On my GSXR the drain hose under tank cap is blocked. If left parked outside in decent rain the water collects and sits.
Doesn't enter your tank though until you open the cap and give it a chance to get past seal. Of course your not always looking directly at the cap so took me awhile to trace a similar fault.
After that I just put a plastic bag underneath an old tank bag when leaving it outside for long periods.
(yes I know I could fix this with blast of compressed air in hose)
Injected bike seems to cope with water though, had same ina carby four cylinder years ago and it barely ran at all.
Also once had a defective poorly fitting plug cap that gave similar random symptons to water in the tank
Govt gives you nothing because it creates nothing - Javier Milei
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