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One problem with these starters is you really get only one good fast revolution for each pull and it can take a long time to get fuel up the line and into the carb (no primer bulb). Another problem is spring strength, when you pull it through compression, the wound up spring is released and is supposed to kick the engine through a complete compression/fire cycle but if the spring isn't strong enough the piston just slows down and stops when it hits compression. They are good when working well but frustrating when they aren't.
One problem with these starters is you really get only one good fast revolution for each pull and it can take a long time to get fuel up the line and into the carb (no primer bulb). Another problem is spring strength, when you pull it through compression, the wound up spring is released and is supposed to kick the engine through a complete compression/fire cycle but if the spring isn't strong enough the piston just slows down and stops when it hits compression. They are good when working well but frustrating when they aren't.