Not true. I have two saito 30's, three 45's, three 80 Twins, a 40, a 90 twin, and a couple of 120's and they all run great on 10% nitro. They are not high compression ratio engines and were all made before 1984. Saito never made anything that was 14 to 1. All my early Saitos were purchased in Japan when I was stationed there and the Japanese use low nitro fuel, 5 to 10% just like I use in the US.