My new 21" Self Propelled mower doesn't cut will on the pull stroke. self propelled "Push" the mower forward and it cuts at one height, move the mower over to the next strip of grass and "pull" it back and the grass is longer.
I know exactly what you mean I had a hell of a time getting it to work by pulling it. Then someone came by and told me its electric you just push a the button and it starts right away. lol hope this helps