There are two plugs underneath the crankcase, one under the oil tank to drain it and the other in the middle of the crankcase to drain fuel oil mix from the two stroke transfer cavity around the crank, it is important to keep the latter well drained if neglected the engine may self consume and run on the oil in the crankcase with damaging and possibly dangerous effect as it frequently happens when the tractor is on a steep slope such as a trailer loading ramp!!!