Building a saw with an aftermarket Cylinder kit....an open port 268 top end from an Asian source. Put it together and measured things.....
With NO base gasket:
Squish .017"
Intake: 76 degrees BTDC
Exhaust: 103 degrees After TDC
Transfers: 132 degrees ATDC
Blow down.....29 degrees???
Going to run it as built....the way most would in the same situation. Curious what that long blow down will do and is it worth bringing it to the 25 degree range. Would be a PITA! Might be able to get a couple of degrees modding the piston crown w/o killing it....
