So the best I could find is a key decoder pick for Yamaha locks. There are 7 positions but only 4 cut depths. If you scan your key and do some photoshop work to overlay this grid on your key, you can line up the cuts and figure out the code. Now whether or not you can find a locksmith that has a Yamaha code cutter is a different story. This is called a Lishi YH35R Key Decoder and you can pick them up for about $30 off eBay.