Nick Malak

My Yamaha tzr 50 lost power while i was riding it earlier, when i let go of the throttle i lost power and couldnt seem to rev it at all. When I twisted the throttle the whole way round it revved a tiny bit but then when let go of the throttle again it just cut out. After this it would take a long time to start and i would have to have the choke on. As i was riding home today this happened about every minute of riding. I have checked the petrol and oil and there is about a quarter left in each and the radiator is full except for about 2cm from the top. As you can probably tell; I am no bike expert so I have no idea what I am doing! Other information is that about 3 days ago it was dropped and lay on its side for about 30 seconds, some fluid was on the floor after but i am not sure what. Any help is greatly appreciated!! Nick