ORIGINAL: downunder

...Take the plug out and see how it feels. I'm presuming it's a pull start car engine and these can feel hard to spin over because of the very small leverage acting directly on the crank-pin. It's not a pinch problem because you can spin it over easily when there's a compression leak. One trick some people do is to loosen the plug just a little to give a small compression leak then, once it's running, tighten the plug but I don't really recommend this.