My boyfriend ordered a RAW Silver 80cc bike engine from rawmotors.com, and they were kind enough to not include an instruction manual. We've managed to put it together via several Youtube videos, but now that we've got it put together, the back tire refuses to turn. And yes, we are using the clutch lever! We went looking on Google and discovered that if we pull the spark plug out, the tire will turn just fine and the engine will start turning. There is no pull-rope for this engine; according to an online manual we found, we must start pedaling, then release the clutch to start the engine. Anyway, we hear this problem is caused by the piston hitting the spark plug. Can anyone help us fix this? And, if possible, could you include photos/describe parts that you are talking about? We have no idea what the names of most of these parts are!