Step 6: I had outstanding results although the grill is never to be the same. If your grill is intended for food preperation you might want to use the neighbors grill while they are in Las Vegas for the weekend.
Older two stroke engines tend to accumulate oily carbon (crud) in the exhaust. With the appropriate level of heat it can be cleared and power restored.
Step 1: An old gas grill will ussually do the trick.