Hi, I just got my mower (5hp Briggs) out for the first time this year and refilled the oil and fuel. Started great then after about 5-10 minutes (about the time it should've been warmed up), it would kind of bog down and quit running. White smoke was coming out of the exaust and from the top of the engine. After letting it cool for about 5-10 minutes it would start up great and run for about 5 more minutes then it would bog down again. Any guesses?
