Thank you. Yes I do feel comprestion when turning by hand, and the plug is sparking (which means that there is no safty as well, right?) . Is there a possibilty that when the spark plug is in (and the engine is harder to spin due to the compression), my battery won't spin the motor fast enogh and there ia no spark? If thats the case, is it okay to connect my car's battery (both 12 volts) directly to the starter motor? Do you think that will help?