We have the same type of problem over in the 1/2A forum with the AP Wasp .061, because of electrics, theres not much left in the way of new small engines to choose from...the wasp is either sworn at or sworn by,,it is a knock off of the Norvel which was a great engine that went under....generally in a small engine it takes about 3 tanks (1-2oz tanks) to break them in..the wasp seems to take quite a bit more, plus you need to remove the back plate and check for machine shavings before you crank it.....Rog