It's normal for the heel of the aluminum lever to deform a bit. Your pictures show a poor match on the parts, I can see how those would break. The new lever and mount look much better.
I'd like to know what squish measurement you get. The motor should not be that difficult to kick over.
The compression vent hole is in the cylinder bore near the top. It's just a tiny little hole that allows some gasses to pass out into the exhaust. It's only effective after the piston rises above the exhaust port. Too small to mean anything when the engine is running.
You'll only see the hole when the cylinder head is removed. Maybe someone with their cylinder currently removed can tell us if the hole can be seen when looking in the exhaust port (from the outside). If so, with the piston at BDC you could see if a thin wire can pass through.
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2011 EC250E
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