tip out all old fuel.replace with fresh.buy a can of easystart(garage or motor factors)follow start procedure after spraying a SMALL! ammount of easy start into the air filter intake.juggle throttle and SMALL spurts of easy start till motor runs on its own.WHEN LAYING UP FOR WINTER RUN THEM UNTIL THEY RUN OUT OF FUEL.the volotile components of fuel evaporate leaving behind gunge.
caine, June 2008