[rjs7734rav]

On my son's bike the oil spinner came loose and wore a hole in the side of the crankcase. I cleaned it out the best I could and replaced the spinner and crankcase cover. Tried to start it and the motor turns just fine but will not start. It has spark but just in case I pulled the coil off my bike and tried it on his and still nothing. Removed the spark plug again and checked for spark again and it has spark. Put my finger in spark plug hole and checked for compression and it has compression. Before I replaced the spark plug I sprayed in some starting fluid and still nothing, not even a back fire. Not willing to start throwing money at the problem without some advice as to where I should be looking. Any help with this will be greatly appreciated.