Just wanted to share with everyone. Was getting the boat ready for shrimping and of course after setting up for the year the yamaha fired up right away but was missing badly. I had fresh gas and new plugs so I knew I was looking at carb. rebuild or at least a cleaning. I talked to a friend and he swore on a treatment called techron. I got a bottle and added to the gas and within 5 minutes she had settled out and was purring like a kitten.