hi, had a rebore oversize new piston and rings, new gaskets, can not start her. compression still down. has any one ran new rings in by driving the crank with a drill.....yamaha dt 50 cc. thanks again, bill j.

And the point of that would be?

It still won't run, and compresion on a 2 stroke is a very mobile figure.

Have you checked the other options such as ignition (which DT's are incredibly sensitive to) or fuel?