I ran a COMO 60 for many years. Great engine. It was my understanding back in the day that the COMO line were Super Tigre's built for world engines. Put a 13x8APC on that 90 and you won't be sorry. If it's like other Super Tigre's it dose not need a lot of nitro. 10-15% will run great through it. I also liked Fox miracle plugs or OS "F" in mine. The OS 8 is a good plug but would be my third choice for this particular engine.
david