These saws remind me of the late 70's early 80's when Electronic fuel injection came out. Every Hot Rodder out there was talking about how this would ruin modifying their cars, now we got 10 second EFI cars, hell it is even used on Top Fuelers now. There are alot of saws out there with the clamshell design. Looking at what is being bought, I suggest we get passed the motor design, and start trying to make it flow, cause I don't think Husquvarna, and Stihl are gonna give up on this design, and it is saleing. You can't change the compression without a popup piston in this design, and no one commercially makes one, that's the end of that. However how do we go about opening up the ports, so the engine will flow, kinda do what we can with what we have, and what the future seems to hold.