Is it running rough with black smoke?most probably a blocked air filter, renew filter and spark plug.If no black smoke out exhaust (running rich) then could be fuel delivery problem(running lean)a blocked jet in the carburator or fuel filter due to contaminants in the fuel will have to clean out,fuel cap not venting. A tight valve or loose valve seat can cause it to cut out. Cuts out dead could be ignition system either igniter coil or safety system fault, switches that kill the spark or fuel stop solenoid on main jet.The trick is to pin point the problem
Dave Fix, May 2011
