Similar probs here with 2 FJR's after a heavy (aka typical UK) rainfall.
Below relates to an 02 gen1 FJR1300
Got back to my workplace after a really heavy rainfall to find my bike would turn over but refused to start. Moved her inside and took a look
Findings: found that the rain (water lol)...
Three short flashes of the headlight usually means Police ahead around here, I refuse to take my hands off the bars to rub the top of my helmet as i always catch the wind blast (i'm 6'3)