cleaned gas tank,replaced fuel line,fuel filter,because mower was not used for 2yrs, changed oil & filter,spark plug,filled with new gas .Had to install new battery,saw that gas went through new filter . Engine started ran but surged ,took carb off cleaned bowl needle&seat,because gas ran through into crank case.Engine ran great,next day noticed the half gallon of gas in fuel tank had leaked by needle &seat and filled crank case. changed oil again. now someone tell me how to rebuild walbro carb.
