I had the same thing happen recently, actually more then once. One time was caused by the battery not being charged enough. I would put the battery on the charger then immediately try it, but didnt realize my battery had gone bad. The next time it ended up being gears in the EZ start binding. Took it apart, regreased and reassembled and everything worked fine. If you do need to replace some gears you can get a replacement kit with all the gears for around $9.