How to drain an Yamaha R1 2001 carbs - 2001 Yamaha YZF-R1

Allen screw? most carbs use either a flathead or JIS screw for the carb drain plug. It's on the bottom of the carburetor bowl.

carbs have a blockage,remove and clean carbs

The carbs are located below the gas tank and are attached to the back of the cylinder head. The drain screw is on the bottom side of the float bowl.

Did you reset (adjust)the float inthe float chamber to tht carburator which is leaking ?
You will probabley have to adjust tht float to stop from overflowing in other words we call it flooding.
Check the float pin of wear at the tip.
Hope this helps!

It is loceated at the bottom of the bowl on the carb and faces down.. A tub shaped part of the carb..

Have a good day !

There are two possible reasons for this - firstly there may be a crack in the carb. bottom. On ly solution is to drain carb, remove bottom of carb and replace with new one (that is if they are available singly), the other problem might be that the gasket is leaking that seals the bottom to the carb body. Check the screws / bolts that hold this bottom part on and see if any are broken, missing, or just loose. If the anwer is no to these questions, the gasket might still have failed. Drain the carb after switching off the fuel tap or disconnecting the fuel tank, once drained remove the carb bottom and check the rubber gasket for swollen areas, breaks or even a small nick. Replace as necessary.

drain the fuel, locate the float bowl drain screw, lowest screw on the carb and loosen it to drain the carb. replace the fuel with proper pre-mix, replace the spark plug and it should be fine