Yap, that's why I like these Echo 25cc engines. You'll be even more impressed after you cut the block down to bare block.

The downside, though, is that electronic ign is a must with these welterweight champs. Since the bare block is so light, the magneto parts add a lot of weight percentage-wise. If I remember correctly, the two engines I showed in the other thread each weighs just under 3lbs RTF as shown.