13.0 to 1 piston

+

the stroke change alone adds a full point becuase of the swept volume change .

+

running the piston head clearance tighter than needed. because of .100 of spacer plate and 2 drz-e base gaskets .010 each =.120 +or -.001

= 15. to 1. (kinda high)

assuming that your measurements are in inches the you will have smaller CR because the normal spacer plate is 2.5mm i believe which is 0.0984 inchs

is that .010 crushed thickness? if so and you ran the spacer plate then it you would be at .1184" total thickness

doing it with the .100 base gasket will give you .120" total thickness.

there is a thread going with some information on how to determine all this. you might want to look into it

http://suzuki.theatvchannel.com/invision/i...st&p=747207