I got a Tiller off of my uncle the other night that had been sitting in the weather for 3 year. Took the thing home put a drop of gas down the spark plug hole and carb. pulled a time or two and fired right up. This is what i dont understand, I let the thing run for about a hour just to run the old gas out then put it up. The next day i went to crank it and nothing. Try to start it the same way and nothing. The plug is getting fire, you put a little drop down the hole and nothing. It just back fire sometimes it seem like it wont even burn the gas that down the spark plug hole out. Can anyone help before i take it to the shop?