LOL! I have an older Zenoah G-26 (magneto) that weighs 59.6 Oz, or 1,689.6 grams! (Maybe a little less - I have a Bennett Built muffler on it.)

But it more than pulls it's weight with an 18 x 6 prop. I've had it on three models and none required any additional balance weight. Right now it's pulling a 17 lb float plane around and it's been a joy. It won't roll the socks of a 3D pilot up and down, but for WWI or sport scale it is simple and reliable. No ignition battery to remember.