You mention heavy rain. Mate of mine had a 600 years ago and rode home from an army base in Germany but once he got back here it wouldn't start again for him.
He took it to a bike shop and they found that there was a leaking seal on the fuel cap, and they pulled about a pint of water out of the tank.
As the bike hasn't moved, i would gently get it up on the centre stand and start by draining the carbs using the carb drain screws. Once settled petrol will float on water, so if there is any water it should settle at the bottom of the tank. This is why is said "gently" get the bike up on the stand.
Obviously you then need to see what comes out of the drain screws.
The fact you cleaned the carbs won't make much difference if they are then being fed with watery fuel.
And get a decent good fitting screwdriver that fits the drain screw slot very well as they are very soft material, and you don't want to start sheering the heads off them.
It's where i would start anyway.
He took it to a bike shop and they found that there was a leaking seal on the fuel cap, and they pulled about a pint of water out of the tank.
As the bike hasn't moved, i would gently get it up on the centre stand and start by draining the carbs using the carb drain screws. Once settled petrol will float on water, so if there is any water it should settle at the bottom of the tank. This is why is said "gently" get the bike up on the stand.
Obviously you then need to see what comes out of the drain screws.
The fact you cleaned the carbs won't make much difference if they are then being fed with watery fuel.
And get a decent good fitting screwdriver that fits the drain screw slot very well as they are very soft material, and you don't want to start sheering the heads off them.
It's where i would start anyway.
More people are born because of alcohol than will ever die from it.