I have an exmark hp yr 2000, 21hp kawa that's is hard to start due to carb is flooded visually when i take the air filter. and after it starts it runs exellent till i shut it off, when trying to restart the engine turns n turns but won't start, it kills my battery n need it to recharge again. what do u think what could be the problem before taking it to the shop....wait for response thanks

You have a problem with your carburator.The problem is most likely the float, the needle valve ,or the needle valve seat. This isn't a difficult fix, you need to remove the fuel bowl under the carburator which is held in place buy a 1/2 inch bolt. There you will see your float, gently push up the float, it should be parallel with the upper section of the carburator. If not adjust float to make this happen. If float is off this is your problem, also float should not be full of gas, if so replace. If not we move on to the needle valve, remove pin that holds up your float and inspect your needle valve tip , if damaged replace. This could be your second problem,if not we move on to the third problem.The needle valve sits in a seat, it is about 1/4 inch round with a 1/32 inch hole in the center, top is flat, bottom is grooved. This seat can be removed with a pick tool. This problem can be fixed with carburator on the engine, but most of the time carburators are removed. You can do what ever you wish.
I believe the problem is with your float adjustment , you can fix this quick and get mowing again.
I am interested in how you make out. GOOD LUCK.