Originally Posted by
fiveoboy01
I've broken in three P5s in the last few months, and when new they will occasionally get stuck on the pinch early in the break in process, even with sufficient heat - to the point where a starter box will just smoke the wheel on the engine flywheel.
A screwdriver to pry the flywheel over is all that's needed. As the engine breaks in, getting stuck on the pinch goes away.
As the pinch goes (wears) away, so does a bit of its power potential. Remember, an engine at operating temp does not have any pinch due to the brass liner expanding at the top. Just think - no pinch when cold means (hypothetically) a perfect seal when cold and a less than perfect seal when hot due to the brass liner expanding more than the piston.