low compression yz400

[yfzut]

im building a quad for my wife based on a yz400f engine, and im wanting to tune it down a bit. does anybody know if a lower than stock compression piston is made and im also looking for a very mild auto decompression cam is made.

[NYMXer]

Add an extra base gasket..........

[One Louder]

does that realy work. what does it do to the performance of the motor?