>>Leslie,
>>I rebuilt a 67 3hp Evinrude, its posted a few pages back as 1967 Evinrude Lightwin Rebuild or something like that. I believe the knob your referring to is actually a low speed adjustment to set the lean of the gas for the lowest and smoothest idle. Those older Evinrude motors have a set high speed. There are two gaskets that get packed in to seal the neeedle and hold pressure. It sounds like yours a worn out and need replacing. You can order a new carb kit from NAPA. There is a sweet link that will tell you everything you need to know about your motor. I will find it and get it to you asap.<< . Brandon would you please post up that link? I've got two Lightwins and consider them to be really awesome motors. One of them I bought for $75 out of the newspaper is getting tired and fouls the lower cylinder spark plug. The other one came from a garage sale and purrs like a kitten. These are really, really, really great motors. They start well in the cold, are built to last, parts are still available, the weedless drive does an excellent job on a small duck boat and two cylinders are super smooth. For about 10 years I used the first one mentioned on on a 15 foot sneak boat traveling very substantial distances on Saginaw Bay and then layout hunting on open water. These little Evinrudes work well for that because if you turn off the gas valve until it quits, then close the gas tank vent you can tuck them under the bow of the boat and they don't leak a drop.