Hi I was wondering if anyone can tell me how to do a quick check on engine compression, I've recently purchased a secondhand but advertised as new and unused reds m7 wcs .21 and am a bit worried now cause I've read elsewhere on this site good compression engines are difficult to turn by hand where as my engine turns quite easily with pipe and plug fitted I am yet to do a run with this engine but it's supposedly not been run since purchased any help would be appreciated as I paid a more than fair price for this engine and it would be a big bite in the ass if it turns out to be a dud

The few engines I've broken in have always been hard to turn over as a consequence of their "pinch" more so than their compression. After they are broken in, and obviously have heaps of life left, the compression doesn't make it particularly hard to turn over...hopefully it is just broken in and ready to go

Put a flywheel on it, hold it and let the engine lean over. If it holds compression then it could be a screamer. You could also warm it up with a hair dryer to around 80-90c to simulate operating temps.