I have a 19HP Kawasaki engine on my ZTR, and have had two problems with engine flooding. How can this be prevented? My dealer told me that sometimes flooding can occur when dirt gets into the carb and holds the needle open. He also advised me that when you switch the gas valve (the one that switches draw from either tank) a vaccuum may occur and flood the carb. When switching the draw from tanks, can the engine be running? Does anyone know a sure way to prevent flooding? This is most likely the simplest question ever asked...but i'm just not sure!