Thanks as8tor,

I'll have to look at that Katana(Funtana) thread.

In the "don't forget Echo" thread, post # 9, Keith states "I forgot to mention that the only difference between the 21cc echo and the 23.6cc echo is the piston and cylinder." That is what I was referring to, considering the porting is mainly in the cylinder walls.

Why did you put a spacer into your 23.6+cc motor? Again in the "don't forger echo" thread, again post #9, Keith mentions recutting the piston crown. I'm assuming you put a spacer to keep the piston from hitting the top of the head. By putting in this spacer you are lowering your compression. Recrowning would also solve the clearance problem but would leave you with a higher compression ratio(more power), wouldn't it?