I had one. They're a brute and can work hard. The recoil pull cord starter is a joke if the engine is cold. They are cold natured and once I had to warm the carb to get mine to start. IME the 660 is heavier and tougher than the 700. I have a first year 700 with fuel injection and power steering. In the Summer my 660 had a habit of boiling the gas in the carb If I rode slow in high temps. If just riding normally it wasn't a problem. I fixed the problem with an aftermarket radiator and higher cfm fan and cut one of the "shark gill" vents on each side.
