How about this one: Shindaiwa hedge trimmer, little 2-stroke. Will run all day long - as long as you don't shut it off! If you do, it takes AT LEAST a half-hour of cooling before it will fire up. But, it will not shut off on it's own. While trying to restart: Tested spark plug - good, strong spark, but it won't burn ether. Carb, lines, tank, filter, cap, gas mix, - all super-CLEAN! Exhaust port and muffler clean and clear. How in the heck can you have a spark and not burn ether? Also, the flywheel is square on the shaft in alignment with the key. Cylinder leak-down test in the green. Pulled the jug - rings and piston, etc. look good, one small burn mark on the piston skirt, cylinder has no scratches and is still smooth. I DON'T GET IT!