Hello, I have a 50 HP Yamaha 2-stroke that is hard to start after it has been sitting for just a couple of days. Once it has been started, it will start fine all day. I squeeze my primer ball until it is hard and has plenty of gas. The engine is only six
Can I assume the engine is cranking fine, just not turning over? There is a trinity of things required for combustion: air, spark and fuel.
You should check for spark or perhaps a carburetor re-build is in order.