I've been flying Saitos for about 30 years, first was a .45 which is still running. I'm actually a big 4-stoke fan, flying OS, Webra, Enyas, and YS in the .20 to 1.20 size all are good runners except the Webras. I have too many Saitos, OS, and Enyas 4 strokers alone to count and they all good runners. Most of the 4-strokers I bought were ones from people who could not set up properly. I will fly gas motors for any airplane over 1.20. Nothing in the world like the sound of a flight of warbirds doing a flyby with a 4-stroke humming right along. I haven't met a 4-stroke motor I didn't like, well Webras did push my upper limit button at times.