The 660 has a gravity fed carb. When I bought mine used the needle valve in the carb didn't hold the fuel back and I had to close the petcock when I shut it off. When I went to start it after it had set for a while I opened the petcock and waited until the carb bowl filled. I had to use my wife's blow dryer to warm the carb to get it to start one time. That is cold natured!
