Water will flood the spark plug [ area ] at top tip which normally is a cover from dust only, then your exhaust is choked with the water level it will make the exhaust very tough, and if you reduce accelerator water will try to enter the engine from silencer side, compression / power will be so weak because water is taking away the heat which is required to burn the fuel & so on ...

physically , the waves from other vehicles will sway your bike to different side ways - a kind of dance -

& if your relatives sitting at your front & back cry, then ?