I went for a 30 seconds ride to my mailbox and sudently it started to run like crap.It felt like the power was not there...i tought the carb was frozen so i put a few drops of alcohol in the tank but didnt worked.Now it start but shut on idle,when i try to give it throtle it run like in reverse without the overide switch on.What could it be?

 

adjust the slack of your throttle cable in the throttle housing on the handlebars {etc} should be just a little bit of slack,not much.

 

Do you have a stock air filter on it? If they get wet they plug up. Dose it run better with the choke on? If it does then it is a fuel problem. It could be frozen like you thought also.Try replacing the plug.

 

the plug was the problem,i think it might be too rich...it was almost black in color.