I own a 96 mxz 583. I am interested in any quick and easy performance tricks for this sled. Some one had told me something about milling the cylinder head. I understand what they mean but how much do you need to mill it and what is the gain. Because of the age of the machine I do not want to invest alot into the machine if you know what I mean. But any input on machining the head or any low cost performance enhancers would be greatly appreciated.