Riding Motorcycle in flood water or riding a Scooter in the Flood water is not recommended by the Two Wheelere manufacturers and mechanics. If that water is mixed with sea water, it may damage more parts of your motorbike or scooter and its body in the long usage with corrosion and erosion. Flash floods in Nepal and Bangladesh used to damage lot of motorcycles and scooters every year due to the owners careless usage. Meanwhile some people had vanished with their motorcycles in the high speed heavy floods. Also riding a motorcycle through the flooded streets with muddy rain water can damage motorbikes in many ways. Motocross (trail) Bikes can withstand the water filled roads and that is too not sure when there is sea water mixed in the flood water. On the other hand street motorcycles are made for commuting purpose on dry surface. They are made for running on good roads and not to run through flood water.

Don't ride electric Motorcycles, e-scooters and electric Bicycles in the rain or flooded streets. Also don't park electric two wheelers while it is raining.. If it is necessary, then put on a cover to protect it. Because rain water can reach in to its motor, electric system, battery pack and can damage the Motorcycle too.

In Sri Lanka and in many other Asian countries people are running their street motorcycles' through the flood waters, without knowing that it can ruin their motorcycles. Riders want to reach their homes even through the rain water. But you must understand that street motorcycle's moving parts are fitted at low height when compared it with a Motocross or off-road motorbike. So when running in flood water, water can enter in to the hub brakes, chain drive, Exhaust pipes and some time in to the engine's oil sump tank, if it is not closed air tight. Water can enter in to the motorcycle Engine too through loose oil filling cap, Chain drive seal, through gear lever seal, kick start seal and through leaking packing’s. Also the front and rear shock absorbers too can suck small amount of water in to them and in the long run the accumulated water can make corrosion on the inside parts.

This kind of water exposure will make the motorcycle parts to get tear and wear (Chain, Bushes and Bearings) specially the chain link will lose its lubricating oil content.
If water had entered in to the oil sump, then you will have to pay large bill to replace all the moving parts of the engine and the repair cost.

Motocross and trail bikes can go through flood water where the water level on the road is found below the Bike's chain level.
Even though using brakes in muddy water will make its parts to be worn out.

Don't Drive Motorcycle in flood water.

Furthermore you may fall in to ditches or large holes that are not visible on the road and can make you to lose your balance and to fall down with your motorcycle. If the motorcycle falls in the water while its engine is running, pistons will suck water in as like a water pump before it stops automatically. Normally when a motorcycle falls down system will stop the engine from sunning on. Also you can run on sharp objects that are not visible to you on the flooded roads and they can rupture your motorcycle Tyre.

Riders may be think it is fun to run in flooded roads and they can reach home quick. But avoid running your motorcycle in flooded waters for your safety and for the durability of your motorcycle. If happened to run in water, take the motorcycle to your mechanic and ask him to check everything to be perfect and there is no water in the motorcycle.

Do following checks if motorcycle ran through flood.
Oil Level, Chain Condition, Rear and Front brakes (If they are drum Brakes).

Motorcycle submerged in flood. Must see Video.

Video. Motorbike rider was swept away by floods in India.

Motorbike riders ignoring flood water. Video.