My ryobi weedeater pulls about 4 inches and stops then I must pull harder till it releases and pulls through another 4 inches until the entire length of starter cord is exhausted. I almost wear out my arm in doing so.sometimes I ask my neighbor to help me.why is this happening?all I did last year was drain my gas and put away inside.

Hi,
Barring a split starter rotor, I would say you have liquid in the cylinder increasing the compression ratio. Remove plug and pull through to blow free.
Peace,
Clarke