It's discontinued from Yamaha so you'll have to go with a left-over. They typically can be had for $300-$400. Look for a complete kit because it includes a dry battery. Otherwise, you'll pay another $80-$100 for that. There is nothing difficult. The kit even comes with the loctite. It will take an evening to install and it's made easier if you put the starter in while your clutch is off for the ring gear install.