I bought a used wood splitter from a friend.It is a really heavy duty homemade model that is made good snd strong.I am having a problem with getting the engine to run to suit me. The engine doesn"t want to really go unless the choke is on.What could be my problem? The splitter has been sitting in a shed for a couple of years not being used. I put in fresh gas and it fired right up but only wants to run with the choke closed all the way. Any ideas ?