Nope, the first production four cycle glow engine was the OS FS60. It was released in 1976. Came in five versions including a marine version. I have all 5. It was released in 76 but Mr. Ogawa of OS was using a prototype a couple years before. The OS 60 started the four cycle revolution and Enya started the horsepower war. Clarence Lee made his famous (infamous?) comment about the OS 60 when it came out. He said he could see no practical use for a four cycle engine in R/C.