My puch was running great until a few days ago. Now it won't start up at all. I thought it was the fuel system. I cleaned everything and installed a filter and clear gas lines. I can see the gas flows well, doesn't seem to have any clogs. I do notice some dark fluid under the connection point where the exhaust pipe meets the engine.
I'm thinking it might be something with the electric system. How can I tell if the spark plug is bad, or if the bike is even getting a spark at all? Do moped use the same spark plugs as cars?