hi. you can take the spark plug out of yhr engine (the easiest one) and put in a long thin rod or screw driver and turn the crank back and forth untill you have the engine at the very top as close as you can get it .(not the most perfect way-but close) and then you can mark the crank to 0 and that should help you. if you have a engine that needs to be closer then you will have to find another way out. dave