Guys,
the one way bearing is inside the crankcase on the .28 spraying stuff into the pullcord hole will just get your cord wet. to clean the one way you will need to remove the pullstart and back plate.
try to store your truck with the nose down so fuel and oil will run out of the one way and use some afterrun oil when your done for the day. Also try not to use fuels with high oil content. 12% or less is best.