They didn't think anyone would be using 30% nitro because the instructions said not to. They clearly stated to use 10 to 15%. There is no four cycle engine that needs 30% nitro. Even the YS which likes high nitro only needs 20% and that's why powermaster makes YS20/20 fuel. The high nitro use didn't start until the last ten years or so and that was certainly well after the 65 came out.

It's not the manufacturers fault that people can't follow instructions. In all the years I worked for Hobby Shack I never heard anyone having any problem with Saito engines because of high compression ratio and I sure never saw any manifestations at any of the local flying fields. The amount of fuel with more than 15% nitro sold at the San Diego Hobby Shack was negligible. I sure don't know who was using 30%. We didn't even carry fuel with that much nitro except for Cox fuel. YS20/20 didn't come out until the last few years or so.

Just exactly which month in 1986 was this RCM review?