ORIGINAL: energyman
Quikturn,
The way I check my abc type engines is to remove the glow plug and turn the engine over slowly by hand with no prop. This will usually indicate if you have pinch left. I have found that the more run time on the engine, the static pinch will be less, but the compression seems to remain good.
Danny
That's how I check them too but was surprised to find little or no pinch although compression is excellent on both engines.