It has always run great and was running great when I stored in over the winter. I drained all gas out before storing it. When I tried to use it for the first time after being in storage, it would not even start. I have checked and/or changed all the following things: replaced the carburetor, spark plug, coil, and made sure it had gas in it. There is no spark to the plug. Does anyone have any ideas of what the problem could be?